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data-event-name="pinnable-header.vector-toc.pin">move to sidebar</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">hide</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">(Top)</div> </a> </li> <li id="toc-Fortress_in_a_corner" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Fortress_in_a_corner"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Fortress in a corner</span> </div> </a> <button aria-controls="toc-Fortress_in_a_corner-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Fortress in a corner subsection</span> </button> <ul id="toc-Fortress_in_a_corner-sublist" class="vector-toc-list"> <li id="toc-Example_game:_Serper_vs._Nakamura,_2004" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Example_game:_Serper_vs._Nakamura,_2004"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>Example game: Serper vs. Nakamura, 2004</span> </div> </a> <ul id="toc-Example_game:_Serper_vs._Nakamura,_2004-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Back-rank_defense" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Back-rank_defense"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.2</span> <span>Back-rank defense</span> </div> </a> <ul id="toc-Back-rank_defense-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Rook_vs._bishop" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Rook_vs._bishop"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.3</span> <span>Rook vs. bishop</span> </div> </a> <ul id="toc-Rook_vs._bishop-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Pawn_and_bishop" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Pawn_and_bishop"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.4</span> <span>Pawn and bishop</span> </div> </a> <ul id="toc-Pawn_and_bishop-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Rook_and_pawn_versus_queen" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Rook_and_pawn_versus_queen"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Rook and pawn versus queen</span> </div> </a> <button aria-controls="toc-Rook_and_pawn_versus_queen-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Rook and pawn versus queen subsection</span> </button> <ul id="toc-Rook_and_pawn_versus_queen-sublist" class="vector-toc-list"> <li id="toc-Example_from_game" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Example_from_game"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Example from game</span> </div> </a> <ul id="toc-Example_from_game-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Similar_example" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Similar_example"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Similar example</span> </div> </a> <ul id="toc-Similar_example-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Example_with_more_pawns" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Example_with_more_pawns"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>Example with more pawns</span> </div> </a> <ul id="toc-Example_with_more_pawns-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Opposite-colored_bishops" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Opposite-colored_bishops"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Opposite-colored bishops</span> </div> </a> <button aria-controls="toc-Opposite-colored_bishops-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Opposite-colored bishops subsection</span> </button> <ul id="toc-Opposite-colored_bishops-sublist" class="vector-toc-list"> <li id="toc-Example_from_game_2" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Example_from_game_2"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Example from game</span> </div> </a> <ul id="toc-Example_from_game_2-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Queen_versus_two_minor_pieces" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Queen_versus_two_minor_pieces"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Queen versus two minor pieces</span> </div> </a> <button aria-controls="toc-Queen_versus_two_minor_pieces-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Queen versus two minor pieces subsection</span> </button> <ul id="toc-Queen_versus_two_minor_pieces-sublist" class="vector-toc-list"> <li id="toc-Bishop_and_knight" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Bishop_and_knight"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Bishop and knight</span> </div> </a> <ul id="toc-Bishop_and_knight-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Two_bishops" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Two_bishops"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2</span> <span>Two bishops</span> </div> </a> <ul id="toc-Two_bishops-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Two_knights" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Two_knights"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.3</span> <span>Two knights</span> </div> </a> <ul id="toc-Two_knights-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-With_pawns" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#With_pawns"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.4</span> <span>With pawns</span> </div> </a> <ul id="toc-With_pawns-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Knight_versus_a_rook_and_pawn" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Knight_versus_a_rook_and_pawn"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Knight versus a rook and pawn</span> </div> </a> <ul id="toc-Knight_versus_a_rook_and_pawn-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bishop_versus_rook_and_bishop_pawn_on_the_sixth_rank" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Bishop_versus_rook_and_bishop_pawn_on_the_sixth_rank"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Bishop versus rook and bishop pawn on the sixth rank</span> </div> </a> <ul id="toc-Bishop_versus_rook_and_bishop_pawn_on_the_sixth_rank-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Defense_perimeter_(pawn_fortress)" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Defense_perimeter_(pawn_fortress)"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Defense perimeter (pawn fortress)</span> </div> </a> <ul id="toc-Defense_perimeter_(pawn_fortress)-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Other_examples" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Other_examples"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Other examples</span> </div> </a> <button aria-controls="toc-Other_examples-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Other examples subsection</span> </button> <ul id="toc-Other_examples-sublist" class="vector-toc-list"> <li id="toc-Fortresses_against_a_bishop" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Fortresses_against_a_bishop"> <div class="vector-toc-text"> <span class="vector-toc-numb">8.1</span> <span>Fortresses against a bishop</span> </div> </a> <ul id="toc-Fortresses_against_a_bishop-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Fortresses_against_a_knight" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Fortresses_against_a_knight"> <div class="vector-toc-text"> <span class="vector-toc-numb">8.2</span> <span>Fortresses against a knight</span> </div> </a> <ul id="toc-Fortresses_against_a_knight-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Fortresses_against_a_rook" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Fortresses_against_a_rook"> <div class="vector-toc-text"> <span class="vector-toc-numb">8.3</span> <span>Fortresses against a rook</span> </div> </a> <ul id="toc-Fortresses_against_a_rook-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Semi-fortress_in_two_bishops_vs._knight" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Semi-fortress_in_two_bishops_vs._knight"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>Semi-fortress in two bishops vs. knight</span> </div> </a> <ul id="toc-Semi-fortress_in_two_bishops_vs._knight-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Positional_draw" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Positional_draw"> <div class="vector-toc-text"> <span class="vector-toc-numb">10</span> <span>Positional draw</span> </div> </a> <ul id="toc-Positional_draw-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">11</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet 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<div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Defensive technique in chess</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">This article is about a defensive technique in chess. For the chess variant, see <a href="/wiki/Fortress_chess" title="Fortress chess">Fortress chess</a>.</div> <p>In <a href="/wiki/Chess" title="Chess">chess</a>, a <b>fortress</b> is an <a href="/wiki/Chess_endgame" title="Chess endgame">endgame</a> <a href="/wiki/Draw_(chess)" title="Draw (chess)">drawing</a> technique in which the side behind in <dfn><a href="/wiki/Glossary_of_chess#material" title="Glossary of chess"><span title="See entry at: Glossary of chess § material" style="color:inherit;" class="glossary-link">material</span></a></dfn> sets up a zone of protection that the opponent cannot penetrate. This might involve keeping the enemy king out of one's position, or a safe zone the enemy cannot force one out of (e.g. see the <a href="/wiki/Opposite-colored_bishops_endgame" title="Opposite-colored bishops endgame">opposite-colored</a> <a href="/wiki/Bishop_(chess)" title="Bishop (chess)">bishops</a> example). An elementary fortress is a theoretically <a href="/wiki/Draw_(chess)" title="Draw (chess)">drawn</a> (i.e. a <dfn><a href="/wiki/Glossary_of_chess#book_draw" title="Glossary of chess"><span title="See entry at: Glossary of chess § book draw" style="color:inherit;" class="glossary-link">book draw</span></a></dfn>) position with reduced material in which a passive defense will maintain the draw.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>Fortresses commonly have the following characteristics: </p> <ol><li>Useful <a href="/wiki/Pawn_(chess)" title="Pawn (chess)">pawn</a> <dfn><a href="/wiki/Glossary_of_chess#breakthrough" title="Glossary of chess"><span title="See entry at: Glossary of chess § breakthrough" style="color:inherit;" class="glossary-link">breakthroughs</span></a></dfn> are not possible.</li> <li>If the stronger side has pawns, they are firmly blocked.</li> <li>The stronger side's <a href="/wiki/King_(chess)" title="King (chess)">king</a> cannot penetrate because it is either cut off or near the edge of the <a href="/wiki/Chessboard" title="Chessboard">board</a>.</li> <li><a href="/wiki/Zugzwang" title="Zugzwang">Zugzwang</a> positions cannot be forced because the defender has <dfn><a href="/wiki/Glossary_of_chess#waiting_move" title="Glossary of chess"><span title="See entry at: Glossary of chess § waiting move" style="color:inherit;" class="glossary-link">waiting moves</span></a></dfn> available.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></li></ol> <p>Fortresses pose a problem for <a href="/wiki/Computer_chess" title="Computer chess">computer chess</a>: computers fail to recognize fortress-type positions (unless using a suitable <a href="/wiki/Endgame_tablebase" title="Endgame tablebase">endgame tablebase</a>) and incorrectly claim a winning advantage in them.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <style data-mw-deduplicate="TemplateStyles:r1141322084">@media all and (max-width:720px){.mw-parser-output .tocleft{width:100%!important}}@media all and (min-width:720px){.mw-parser-output .tocleft{float:left;clear:left;width:auto;margin:0 1em 0.5em 0}body.skin-vector-2022 .mw-parser-output .tocleft{margin:0}.mw-parser-output .tocleft-clear-both{clear:both}.mw-parser-output .tocleft-clear-none{clear:none}}</style><div class="tocleft" style=""><meta property="mw:PageProp/toc" /></div><style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><style data-mw-deduplicate="TemplateStyles:r1097430093">@media(min-width:720px){.mw-parser-output .algebraic-notation-toc{float:left}}</style><div role="note" class="side-box metadata side-box-left algebraic-notation algebraic-notation-toc"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style> <div class="side-box-flex"> <div class="side-box-text plainlist">This article uses <a href="/wiki/Algebraic_notation_(chess)" title="Algebraic notation (chess)">algebraic notation</a> to describe chess moves.</div></div> </div><div style="clear:left;" class=""></div> <div class="mw-heading mw-heading2"><h2 id="Fortress_in_a_corner">Fortress in a corner</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=1" title="Edit section: Fortress in a corner"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px"> </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a8 black king"><img alt="a8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a6 white pawn"><img alt="a6 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b6 white king"><img alt="b6 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:182px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e1 white bishop"><img alt="e1 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/26px-Chess_blt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/39px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/52px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Bishop and wrong rook pawn: draw </div></div></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px"> </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:26px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a7 white pawn"><img alt="a7 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 black king"><img alt="b7 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c6 white knight"><img alt="c6 white knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/26px-Chess_nlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/39px-Chess_nlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/52px-Chess_nlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 white king"><img alt="e6 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Knight protecting rook pawn on the seventh rank: draw </div></div></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px"> </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g8 black king"><img alt="g8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c7 black rook"><img alt="c7 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/26px-Chess_rdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/39px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/52px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 black pawn"><img alt="d6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 white king"><img alt="e6 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h6 white queen"><img alt="h6 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/26px-Chess_qlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/39px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/52px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e5 black bishop"><img alt="e5 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/26px-Chess_bdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/39px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/52px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 white pawn"><img alt="g5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Bishop, Rook and King protect f7, g7, h7: draw </div></div></div> <p>Perhaps the most common type of fortress, often seen in <a href="/wiki/Chess_endgame" title="Chess endgame">endgames</a> with only a few <a href="/wiki/Chess_piece" title="Chess piece">pieces</a> on the <a href="/wiki/Chessboard" title="Chessboard">board</a>, is where the defending king is able to take refuge in a corner of the board and cannot be forced away or checkmated by the superior side. These two diagrams furnish two classic examples. In both cases, Black simply shuffles their king between a8 and the available square adjacent to a8 (a7, b7, or b8, depending on the position of the white king and pawn). White has no way to dislodge Black's king, and can do no better than a draw by <a href="/wiki/Stalemate" title="Stalemate">stalemate</a> or some other means. </p><p>Note that the bishop and <a href="/wiki/Wrong_rook_pawn" title="Wrong rook pawn">wrong rook pawn</a> ending (i.e. where the pawn is a <a href="/wiki/Rook_pawn" class="mw-redirect" title="Rook pawn">rook pawn</a> whose <a href="/wiki/Promotion_(chess)" title="Promotion (chess)">promotion</a> square is the color opposite to that of the bishop) in the diagram is a draw even if the pawn is on the seventh <a href="/wiki/Rank_(chess)" class="mw-redirect" title="Rank (chess)">rank</a> or further back on the a-<dfn><a href="/wiki/Glossary_of_chess#file" title="Glossary of chess"><span title="See entry at: Glossary of chess § file" style="color:inherit;" class="glossary-link">file</span></a></dfn>. Heading for a bishop and wrong rook pawn ending is a fairly common drawing resource available to the inferior side.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>The <a href="/wiki/Knight_(chess)" title="Knight (chess)">knight</a> and rook pawn position in the diagram, however, is a draw only if White's pawn is already on the seventh rank, making this drawing resource available to the defender much less frequently. White wins if the pawn is not yet on the seventh rank and is protected by the knight from behind. With the pawn on the seventh rank, Black has a stalemate defense with their king in the corner.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading3"><h3 id="Example_game:_Serper_vs._Nakamura,_2004"><span id="Example_game:_Serper_vs._Nakamura.2C_2004"></span>Example game: Serper vs. Nakamura, 2004</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=2" title="Edit section: Example game: Serper vs. Nakamura, 2004"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Serper vs. Nakamura </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:66px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 black king"><img alt="d5 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 black pawn"><img alt="g5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e4 black pawn"><img alt="e4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c3 black bishop"><img alt="c3 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e3 white pawn"><img alt="e3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g3 black pawn"><img alt="g3 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h3 white pawn"><img alt="h3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e2 white king"><img alt="e2 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f2 white knight"><img alt="f2 white knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/22px-Chess_nlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/33px-Chess_nlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/44px-Chess_nlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g2 white pawn"><img alt="g2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">White to play </div></div></div> <p>A fortress is often achieved by a <a href="/wiki/Sacrifice_(chess)" title="Sacrifice (chess)">sacrifice</a>, such as of a piece for a pawn. In the game between <a href="/wiki/Grigory_Serper" class="mw-redirect" title="Grigory Serper">Gregory Serper</a> and <a href="/wiki/Hikaru_Nakamura" title="Hikaru Nakamura">Hikaru Nakamura</a>,<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> in the 2004 <a href="/wiki/U.S._Chess_Championship" class="mw-redirect" title="U.S. Chess Championship">U.S. Chess Championship</a>, White would lose after 1.Nd1 Kc4 or 1.Nh1 Be5 or 1.Ng4 Bg7. Instead he played </p> <dl><dd><b>1. Nxe4! Kxe4</b></dd> <dd><b>2. Kf1!</b></dd></dl> <p>Heading for h1. After another 10 moves the position in the following diagram was reached: </p> <div style="clear:both;" class=""></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Serper vs. Nakamura </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:66px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e5 black bishop"><img alt="e5 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 black pawn"><img alt="g5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g3 black pawn"><img alt="g3 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h3 white pawn"><img alt="h3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g2 white pawn"><img alt="g2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:154px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e1 black king"><img alt="e1 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:154px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h1 white king"><img alt="h1 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Black to play. White has achieved a fortress. </div></div></div> <p>Black has no way of forcing White's king away from the corner, so he played </p> <dl><dd><b>12... Kf2</b></dd></dl> <p>and after 13.h4 gxh4 the game was drawn by stalemate. </p> <div class="mw-heading mw-heading3"><h3 id="Back-rank_defense">Back-rank defense</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=3" title="Edit section: Back-rank defense"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div style="clear:both;" class=""></div> <div class="thumb noviewer tleft"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px"> </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b8 black rook"><img alt="b8 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/26px-Chess_rdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/39px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/52px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:0px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g8 black king"><img alt="g8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a7 white rook"><img alt="a7 white rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/26px-Chess_rlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/39px-Chess_rlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/52px-Chess_rlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g6 white pawn"><img alt="g6 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h6 white king"><img alt="h6 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">The <i>back-rank defense</i> in rook and pawn versus rook endings: another type of fortress in a corner</div></div></div> <p>The <a href="/wiki/Rook_and_pawn_versus_rook_endgame#Back-rank_defense" title="Rook and pawn versus rook endgame">back-rank defense</a> in some <a href="/wiki/Rook_and_pawn_versus_rook_endgame" title="Rook and pawn versus rook endgame">rook and pawn versus rook endgames</a> is another type of fortress in a corner (see diagram). The defender perches their king on the pawn's queening square, and keeps their <a href="/wiki/Rook_(chess)" title="Rook (chess)">rook</a> on the back rank (on the "long side" of the king, not, e.g., on h8 in the diagram position) to guard against horizontal checks. If 1.Rg7+ in the diagram position, Black heads into the corner with 1...Kh8! Note that this defense works <i>only</i> against rook pawns and knight pawns.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Rook_vs._bishop">Rook vs. bishop</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=4" title="Edit section: Rook vs. bishop"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div style="clear:both;" class=""></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Seirawan, 2003 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c8 white rook"><img alt="c8 white rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/26px-Chess_rlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/39px-Chess_rlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/52px-Chess_rlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:0px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g8 black bishop"><img alt="g8 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/26px-Chess_bdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/39px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/52px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:0px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h8 black king"><img alt="h8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h6 white king"><img alt="h6 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Rook versus bishop, with the defending king in the "safe" corner. White to move, draw.</div></div></div> <p>In the ending of a rook versus a bishop, the defender can form a fortress in the "safe" corner—the corner that is not of the color on which the bishop resides (see diagram). White must release the potential stalemate, but they cannot improve their position.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p> <dl><dd><b>1. Rc3 Ba2</b></dd> <dd><b>2. Rc2 Bb3</b></dd> <dd><b>3. Rc7 Bg8</b></dd></dl> <div class="mw-heading mw-heading3"><h3 id="Pawn_and_bishop">Pawn and bishop</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=5" title="Edit section: Pawn and bishop"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div style="clear:both;" class=""></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">de la Villa, 2008 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:26px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 black bishop"><img alt="b7 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/26px-Chess_bdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/39px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/52px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e3 black king"><img alt="e3 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g3 black pawn"><img alt="g3 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g2 white pawn"><img alt="g2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:182px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f1 white king"><img alt="f1 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Draw with bishop on either color if the white king does not leave the corner </div></div></div> <p>In this position from de la Villa, White draws if their king does not leave the corner. It is also a draw if the bishop is on the other color, so it is not a case of the <a href="/wiki/Wrong_bishop" title="Wrong bishop">wrong bishop</a>.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading2"><h2 id="Rook_and_pawn_versus_queen">Rook and pawn versus queen</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=6" title="Edit section: Rook and pawn versus queen"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Van der Poel vs. Smits, 2000 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g8 white queen"><img alt="g8 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/26px-Chess_qlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/39px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/52px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d7 black king"><img alt="d7 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e7 black pawn"><img alt="e7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f6 black rook"><img alt="f6 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/26px-Chess_rdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/39px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/52px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e5 white king"><img alt="e5 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">The basic fortress with rook and pawn on the second rank versus a queen </div></div></div> <p>In the diagram, Black draws by moving his rook back and forth between the d6- and f6-squares, or moves his king when <a href="/wiki/Check_(chess)" title="Check (chess)">checked</a>, staying behind the rook and next to the pawn. This fortress works when all of these conditions are met: </p> <ul><li>The pawn is still on its second <dfn><a href="/wiki/Glossary_of_chess#rank" title="Glossary of chess"><span title="See entry at: Glossary of chess § rank" style="color:inherit;" class="glossary-link">rank</span></a></dfn>.</li> <li>The pawn is on <dfn><a href="/wiki/Glossary_of_chess#file" title="Glossary of chess"><span title="See entry at: Glossary of chess § file" style="color:inherit;" class="glossary-link">files</span></a></dfn> <i>b</i> through <i>g</i>.</li> <li>The pawn is protecting its rook on the third rank.</li> <li>The opposing king is beyond the defender's third rank.</li> <li>The defending king protects its pawn.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup></li></ul> <p>The white king is not able to cross the rank of the black rook, and the white <a href="/wiki/Queen_(chess)" title="Queen (chess)">queen</a> is unable to do anything useful. </p> <dl><dd><b>1. Qd5+ Rd6</b></dd> <dd><b>2. Qb5+ Kd8</b></dd> <dd><b>3. Qb8+ Kd7</b></dd> <dd><b>4. Qb5+ ½-½</b></dd></dl> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px"> </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:26px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a7 black cross"><img alt="a7 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 black cross"><img alt="b7 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c7 black cross"><img alt="c7 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d7 black cross"><img alt="d7 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e7 black cross"><img alt="e7 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f7 black cross"><img alt="f7 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g7 black cross"><img alt="g7 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h7 black cross"><img alt="h7 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b6 black cross"><img alt="b6 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c6 black cross"><img alt="c6 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 black cross"><img alt="d6 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 black cross"><img alt="e6 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f6 black cross"><img alt="f6 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g6 black cross"><img alt="g6 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b5 black cross"><img alt="b5 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 black cross"><img alt="g5 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b4 black cross"><img alt="b4 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g4 black cross"><img alt="g4 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a3 black cross"><img alt="a3 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b3 black cross"><img alt="b3 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g3 black cross"><img alt="g3 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h3 black cross"><img alt="h3 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b2 black cross"><img alt="b2 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c2 black cross"><img alt="c2 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d2 black cross"><img alt="d2 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e2 black cross"><img alt="e2 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f2 black cross"><img alt="f2 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g2 black cross"><img alt="g2 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/26px-Chess_xxt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/39px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/52px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Drawing places of a white pawn, from White's perspective </div></div></div> <p>Positions such as these (when the defending rook and king are near the pawn and the opposing king cannot attack from behind) are drawn when (see diagram): </p> <ul><li>the pawn is on the c-, d-, e-, or f-file and the second, sixth, or seventh rank</li> <li>the pawn is anywhere on the b- or g-file</li> <li>the pawn is on the a- or h-file and the third or seventh rank.</li></ul> <p>Otherwise, the queen wins.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading3"><h3 id="Example_from_game">Example from game</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=7" title="Edit section: Example from game"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Marcotulli vs. Malström, 2001 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h8 white queen"><img alt="h8 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/26px-Chess_qlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/39px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/52px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c7 black rook"><img alt="c7 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/26px-Chess_rdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/39px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/52px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 white king"><img alt="e6 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b5 black pawn"><img alt="b5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b3 black king"><img alt="b3 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Black can reach a drawing fortress. </div></div></div> <p>In this position, with Black to move, Black can reach a drawing fortress. </p> <dl><dd><b>1...b4</b></dd> <dd><b>2. Kd6 Rc3</b></dd> <dd><b>3. Kd7</b></dd></dl> <p>and now 3...Ka3 and several other moves reach the fortress. In the actual game, Black made the weak move 3...Rd3? and lost.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading3"><h3 id="Similar_example">Similar example</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=8" title="Edit section: Similar example"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Whitaker vs. Ferriz, 1959 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:78px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a5 black queen"><img alt="a5 black queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/Chess_qdt45.svg/26px-Chess_qdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/Chess_qdt45.svg/39px-Chess_qdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/47/Chess_qdt45.svg/52px-Chess_qdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f5 black king"><img alt="f5 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h5 black pawn"><img alt="h5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e3 white rook"><img alt="e3 white rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/26px-Chess_rlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/39px-Chess_rlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/52px-Chess_rlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g2 white pawn"><img alt="g2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h2 white king"><img alt="h2 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Position after 50.Re3 </div></div></div> <p>In this 1959 game between <a href="/wiki/Norman_Tweed_Whitaker" class="mw-redirect" title="Norman Tweed Whitaker">Whitaker</a> and Ferriz, White sacrificed a rook for a knight in order to exchange a pair of pawns and reach this position, and announced that it was a draw because (1) the queen cannot mate alone, and (2) the black king and pawn cannot approach to help.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> However, <a href="/wiki/Endgame_tablebase" title="Endgame tablebase">endgame tablebase</a> analysis shows Black to have a forced win in 19 moves starting with 50... Qc7+ (the only winning move), taking advantage of the fact that the rook is currently unprotected – again illustrating how tablebases are refining traditional endgame theory. </p> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading3"><h3 id="Example_with_more_pawns">Example with more pawns</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=9" title="Edit section: Example with more pawns"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Salov vs. Korchnoi, 1997 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:26px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f7 black pawn"><img alt="f7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h7 black king"><img alt="h7 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h6 black pawn"><img alt="h6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f5 white rook"><img alt="f5 white rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/26px-Chess_rlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/39px-Chess_rlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/52px-Chess_rlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g4 white pawn"><img alt="g4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f3 white pawn"><img alt="f3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:182px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e1 black queen"><img alt="e1 black queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/Chess_qdt45.svg/26px-Chess_qdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/Chess_qdt45.svg/39px-Chess_qdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/47/Chess_qdt45.svg/52px-Chess_qdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:182px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g1 white king"><img alt="g1 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Even with equal pawns, Korchnoi could not break through Salov's fifth-rank defense. </div></div></div> <p>From the diagram, in <a href="/wiki/Valery_Salov" title="Valery Salov">Salov</a> vs. <a href="/wiki/Viktor_Korchnoi" title="Viktor Korchnoi">Korchnoi</a>, <a href="/wiki/Wijk_aan_Zee" title="Wijk aan Zee">Wijk aan Zee</a> 1997,<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> White was able to hold a draw with a rook versus a queen, even with the sides having an equal number of pawns. He kept his rook on the fifth rank blocking in Black's king, and was careful not to lose his rook to a <a href="/wiki/Fork_(chess)" title="Fork (chess)">fork</a> or allow a queen <a href="/wiki/Sacrifice_(chess)" title="Sacrifice (chess)">sacrifice</a> for the rook in circumstances where that would win for Black. The players <a href="/wiki/Draw_by_agreement" title="Draw by agreement">agreed to a draw</a> after: </p> <dl><dd><b>48. Kg2 Kg6 49. Rh5 Qe2+ 50. Kg3 Qf1 51. Kf4 Qe1 52. Rd5 Qc1+ 53. Kg3 Qc7+ 54. Kg2 Qf4 55. Rh5 Kf6 56. Rd5 Ke6 57. Rh5 Qd2+ 58. Kg3 f6 59. Rf5 Qc1 60. Rh5 Qg1+ 61. Kf4 Qe1 62. Rb5 Qc1+ 63. Kg3 Qg1+ 64. Kf4 Qh2+ 65. Ke3 Kf7 66. Rh5 Qg1+ 67. Kf4 Kg6 68. Rd5 Qh2+ 69. Ke3 Kf7 70. Rh5 Qg1+ 71. Kf4 Ke6 72. Rb5 Qh2+ 73. Ke3 Kd6 74. Rf5 Qb2 75. Rh5 Ke6 76. Kf4 Qc3 77. Kg3 Qc7+ 78. Kg2 Qf7 79. Rb5 Qe8 80. Rf5 Qg6 81. Rb5 ½–½</b></dd></dl> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading2"><h2 id="Opposite-colored_bishops">Opposite-colored bishops</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=10" title="Edit section: Opposite-colored bishops"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Opposite-colored_bishops_endgame" title="Opposite-colored bishops endgame">Opposite-colored bishops endgame</a></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px"> </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:26px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c7 black king"><img alt="c7 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 white bishop"><img alt="e6 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/26px-Chess_blt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/39px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/52px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f6 black pawn"><img alt="f6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c5 black bishop"><img alt="c5 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/26px-Chess_bdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/39px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/52px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e5 black pawn"><img alt="e5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 black pawn"><img alt="g5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e4 white king"><img alt="e4 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h4 black pawn"><img alt="h4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h3 white pawn"><img alt="h3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Drawing fortress with bishops on opposite colors, Black to move </div></div></div> <p>In <a href="/wiki/Opposite-colored_bishops_endgame" title="Opposite-colored bishops endgame">endings with bishops of opposite colors</a> (i.e. where one player has a bishop that moves on light squares, while the other player's bishop moves on dark squares), it is often possible to establish a fortress, and thus hold a draw, when one player is one, two, or occasionally even three pawns behind. A typical example is seen in the diagram. White, although three pawns behind, has established a drawing fortress, since Black has no way to contest White's stranglehold over the light squares. White simply keeps his bishop on the h3–c8 diagonal.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading3"><h3 id="Example_from_game_2">Example from game</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=11" title="Edit section: Example from game"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Lautier vs. Rublevsky, 2003 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:26px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f7 black pawn"><img alt="f7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g7 white king"><img alt="g7 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 black king"><img alt="e6 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 white bishop"><img alt="g5 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/26px-Chess_blt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/39px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/52px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f4 white pawn"><img alt="f4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g4 black bishop"><img alt="g4 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/26px-Chess_bdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/39px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/52px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h4 white pawn"><img alt="h4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g3 white pawn"><img alt="g3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Black to move gives up a pawn to set up a fortress. </div></div></div> <p>In an endgame with opposite-colored bishops, positional factors may be more important than material. In this position, Black <a href="/wiki/Sacrifice_(chess)" title="Sacrifice (chess)">sacrifices</a> a pawn (leaving him three pawns down) to reach a fortress. </p> <dl><dd><b>1... Kf5!</b></dd> <dd><b>2. Kxf7 Bh5+</b></dd> <dd><b>3. Kg7 Bd1</b></dd> <dd><b>4. Be7 ½-½</b></dd></dl> <p>After 4...Be2 5.Kh6 Bd1 6.h5 Black just waits by playing 6...Be2.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading2"><h2 id="Queen_versus_two_minor_pieces">Queen versus two minor pieces</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=12" title="Edit section: Queen versus two minor pieces"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Here are drawing fortresses with two <dfn><a href="/wiki/Glossary_of_chess#minor_piece" title="Glossary of chess"><span title="See entry at: Glossary of chess § minor piece" style="color:inherit;" class="glossary-link">minor pieces</span></a></dfn> versus a <a href="/wiki/Queen_(chess)" title="Queen (chess)">queen</a>.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> Usually the defending side will not be able to get to one of these positions. </p> <div class="mw-heading mw-heading3"><h3 id="Bishop_and_knight">Bishop and knight</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=13" title="Edit section: Bishop and knight"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px"> </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a8 black king"><img alt="a8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 black bishop"><img alt="b7 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/26px-Chess_bdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/39px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/52px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 white queen"><img alt="d6 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/26px-Chess_qlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/39px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/52px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c5 white king"><img alt="c5 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 black knight"><img alt="d5 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/26px-Chess_ndt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/39px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/52px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Drawing fortress (in either corner that the bishop controls)</div></div></div> <p>The bishop and knight fortress is another type of fortress in a corner. If necessary, the king can move to one of the squares adjacent to the corner, and the bishop can retreat to the corner. This gives the inferior side enough tempo moves to avoid <a href="/wiki/Zugzwang" title="Zugzwang">zugzwang</a>. For example:<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> </p> <dl><dd><b>1. Kb5 Ka7</b></dd> <dd><b>2. Qd8 Ba8</b></dd> <dd><b>3. Ka5 Bb7</b>.</dd></dl> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading3"><h3 id="Two_bishops">Two bishops</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=14" title="Edit section: Two bishops"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px"><a href="/wiki/Giambattista_Lolli" title="Giambattista Lolli">Lolli</a>, 1763 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:26px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 black king"><img alt="b7 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b6 black bishop"><img alt="b6 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/26px-Chess_bdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/39px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/52px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c6 black bishop"><img alt="c6 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/26px-Chess_bdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/39px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/52px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 white queen"><img alt="e6 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/26px-Chess_qlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/39px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/52px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b4 white king"><img alt="b4 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Drawing fortress (in any corner), the Lolli position </div></div></div> <p>In the two bishop versus queen ending, the queen wins if the <a href="/wiki/Giambattista_Lolli" title="Giambattista Lolli">Lolli</a> position is not reached, but some of them take up to seventy-one moves to either checkmate or win a bishop, so the <a href="/wiki/Fifty-move_rule" title="Fifty-move rule">fifty-move rule</a> comes into play. From the diagram: </p> <dl><dd><b>1. Qe7+ Kc8</b></dd> <dd><b>2. Qe6+ Kb7</b></dd> <dd><b>3. Qd6 Ba7</b></dd> <dd><b>4. Qe7+ Kb6!</b></dd> <dd><b>5. Qd8+ Kb7!</b></dd> <dd><b>6. Ka5 Bc5!</b></dd></dl> <p>and White cannot prevent ... Bb6, which gets back to the Lolli position.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading3"><h3 id="Two_knights">Two knights</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=15" title="Edit section: Two knights"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px"> </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:52px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 black knight"><img alt="e6 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/26px-Chess_ndt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/39px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/52px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f6 black knight"><img alt="f6 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/26px-Chess_ndt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/39px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/52px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e5 black king"><img alt="e5 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e3 white king"><img alt="e3 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a2 white queen"><img alt="a2 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/26px-Chess_qlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/39px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/52px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Drawing fortress </div></div></div> <p>In the two knights fortress, the knights are next to each other and their king should be between them and the attacking king. The defender must play accurately, though.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Lolli, 1763 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:78px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 white queen"><img alt="d5 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/26px-Chess_qlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/39px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/52px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b4 black knight"><img alt="b4 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/26px-Chess_ndt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/39px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/52px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c4 black knight"><img alt="c4 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/26px-Chess_ndt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/39px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/52px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c3 black king"><img alt="c3 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f3 white king"><img alt="f3 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Draw </div></div></div> <p>There are several drawing positions with two knights against a queen. The best way is to have the knights adjacent to each other on a file or rank, with their king between them and the enemy king. This is not a true fortress since it is not static. The position of the knights may have to change depending on the opponent's moves. In this position (Lolli, 1763), </p> <dl><dd><b>1. Qd1 Nd2+</b></dd> <dd><b>2. Ke2 Nb3</b></dd></dl> <p>and Black has an ideal defensive position. </p> <div style="clear:both;" class=""></div> <style data-mw-deduplicate="TemplateStyles:r1216972533">.mw-parser-output .col-begin{border-collapse:collapse;padding:0;color:inherit;width:100%;border:0;margin:0}.mw-parser-output .col-begin-small{font-size:90%}.mw-parser-output .col-break{vertical-align:top;text-align:left}.mw-parser-output .col-break-2{width:50%}.mw-parser-output .col-break-3{width:33.3%}.mw-parser-output .col-break-4{width:25%}.mw-parser-output .col-break-5{width:20%}@media(max-width:720px){.mw-parser-output .col-begin,.mw-parser-output .col-begin>tbody,.mw-parser-output .col-begin>tbody>tr,.mw-parser-output .col-begin>tbody>tr>td{display:block!important;width:100%!important}.mw-parser-output .col-break{padding-left:0!important}}</style><div> <table class="col-begin" role="presentation" style="width: auto; float:right; clear:right;"> <tbody><tr> <td class="col-break"> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px"> </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:22px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e7 black knight"><img alt="e7 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/22px-Chess_ndt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/33px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/44px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a6 black cross"><img alt="a6 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/22px-Chess_xxt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/33px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/44px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b6 black cross"><img alt="b6 black cross" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/22px-Chess_xxt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/33px-Chess_xxt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Chess_xxt45.svg/44px-Chess_xxt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 black knight"><img alt="d6 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/22px-Chess_ndt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/33px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/44px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 black king"><img alt="e6 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f4 white queen"><img alt="f4 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/22px-Chess_qlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/33px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/44px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d3 white king"><img alt="d3 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">White to move. Draw with the queen anywhere except the marked squares. </div></div></div> </td> <td class="col-break"> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px"> </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:22px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d7 black knight"><img alt="d7 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/22px-Chess_ndt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/33px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/44px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 black king"><img alt="e6 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f6 black knight"><img alt="f6 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/22px-Chess_ndt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/33px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/44px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e3 white king"><img alt="e3 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f3 white queen"><img alt="f3 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/22px-Chess_qlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/33px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/44px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Draw, but Black must keep his king in a good position. </div></div></div> <p>  </p> </td></tr></tbody></table></div> <p>If the knights cannot be adjacent to each other on a file or rank, the second best position is if they are next to each other diagonally (see diagram). </p><p>The third type of defensive formation is with the knights protecting each other, but this method is more risky.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading3"><h3 id="With_pawns">With pawns</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=16" title="Edit section: With pawns"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tleft"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Ree vs. Hort </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e8 black king"><img alt="e8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:0px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f8 black knight"><img alt="f8 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/22px-Chess_ndt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/33px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/44px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:0px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g8 white queen"><img alt="g8 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/22px-Chess_qlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/33px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/44px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h7 black rook"><img alt="h7 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/22px-Chess_rdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/33px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/44px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 black pawn"><img alt="d6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g6 black pawn"><img alt="g6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c5 black bishop"><img alt="c5 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 white pawn"><img alt="d5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f5 black pawn"><img alt="f5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 white pawn"><img alt="g5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f4 white pawn"><img alt="f4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h4 white knight"><img alt="h4 white knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/22px-Chess_nlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/33px-Chess_nlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/44px-Chess_nlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g3 white king"><img alt="g3 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Black to play </div></div></div> <div class="thumb noviewer tleft"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Ree vs. Hort </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f8 black knight"><img alt="f8 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/22px-Chess_ndt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/33px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/44px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:0px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g8 white queen"><img alt="g8 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/22px-Chess_qlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/33px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/44px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e7 black king"><img alt="e7 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 black pawn"><img alt="d6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g6 black pawn"><img alt="g6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 white pawn"><img alt="d5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f5 black pawn"><img alt="f5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 white pawn"><img alt="g5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f4 white pawn"><img alt="f4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f3 white king"><img alt="f3 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:154px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a1 black bishop"><img alt="a1 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Draw agreed. Black has established an impenetrable fortress. </div></div></div> <p>Sometimes the two minor pieces can achieve a fortress against a queen even where there are pawns on the board. In <a href="/wiki/Hans_Ree" title="Hans Ree">Ree</a>-<a href="/wiki/Vlastimil_Hort" title="Vlastimil Hort">Hort</a>, <a href="/wiki/Wijk_aan_Zee" title="Wijk aan Zee">Wijk aan Zee</a> 1986 <sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> (first diagram), Black had the material disadvantage of rook and bishop against a queen. Dvoretsky writes that Black would probably lose after the natural 1...Bf2+? 2.Kxf2 Rxh4 because of 3.Kg3 Rh7 4.Kf3, followed by a king march to c6, or 3.Qg7!? Rxf4+ 4.Kg3 Rg4+ 5.Kf3, threatening 6.Qf6 or 6.Qc7.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> Instead, Hort forced a draw with <b>1... Rxh4!! 2. Kxh4 Bd4!</b> (imprisoning White's queen) <b>3. Kg3 Ke7 4.Kf3 Ba1</b> (second diagram), and the players agreed to a draw. White's queen has no moves, all of Black's pawns are protected, and his bishop will shuttle back and forth on the squares a1, b2, c3, and d4. </p> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading2"><h2 id="Knight_versus_a_rook_and_pawn">Knight versus a rook and pawn</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=17" title="Edit section: Knight versus a rook and pawn"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Em. Lasker vs. Ed. Lasker, 1924 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:104px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a4 white knight"><img alt="a4 white knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/26px-Chess_nlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/39px-Chess_nlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/52px-Chess_nlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b4 white king"><img alt="b4 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f4 black king"><img alt="f4 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b3 black pawn"><img alt="b3 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g3 black rook"><img alt="g3 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/26px-Chess_rdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/39px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/52px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">A surprising draw </div></div></div> <p>At the great <a href="/wiki/New_York_City" title="New York City">New York City</a> 1924 tournament, former <a href="/wiki/World_Chess_Championship" title="World Chess Championship">world champion</a> <a href="/wiki/Emanuel_Lasker" title="Emanuel Lasker">Emanuel Lasker</a> was in trouble against his namesake <a href="/wiki/Edward_Lasker" title="Edward Lasker">Edward Lasker</a>, but surprised everyone by discovering a new endgame fortress.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> Despite having only a knight for a rook and pawn, White draws by moving his knight back and forth between b2 and a4. Black's only real winning try is to get his king to c2. However, to do so Black has to move his king so far from the pawn that White can play Ka3–b2 and Nc5xb3, when the rook versus knight ending is an easy draw. The game concluded: </p> <dl><dd><b>93. Nb2 Ke4 94. Na4 Kd4 95. Nb2 Rf3 96. Na4 Re3 97. Nb2 Ke4 98. Na4 Kf3 99. Ka3! Ke4</b></dd></dl> <p>If 99...Ke2, 100.Nc5 Kd2 101.Kb2! (101.Nxb3+?? Kc2 and Black wins) and 102.Nxb3 draws. </p> <dl><dd><b>100. Kb4 Kd4 101. Nb2 Rh3 102. Na4 Kd3 103. Kxb3 Kd4+ ½–½</b></dd></dl> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading2"><h2 id="Bishop_versus_rook_and_bishop_pawn_on_the_sixth_rank">Bishop versus rook and bishop pawn on the sixth rank</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=18" title="Edit section: Bishop versus rook and bishop pawn on the sixth rank"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">from de la Villa, page 220 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f8 black king"><img alt="f8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 white rook"><img alt="b7 white rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/26px-Chess_rlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/39px-Chess_rlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/52px-Chess_rlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 black circle"><img alt="e6 black circle" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Chess_xot45.svg/26px-Chess_xot45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Chess_xot45.svg/39px-Chess_xot45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Chess_xot45.svg/52px-Chess_xot45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f6 white pawn"><img alt="f6 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 black circle"><img alt="d5 black circle" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Chess_xot45.svg/26px-Chess_xot45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Chess_xot45.svg/39px-Chess_xot45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Chess_xot45.svg/52px-Chess_xot45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e5 white king"><img alt="e5 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c4 black bishop"><img alt="c4 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/26px-Chess_bdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/39px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/52px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b3 black circle"><img alt="b3 black circle" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Chess_xot45.svg/26px-Chess_xot45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Chess_xot45.svg/39px-Chess_xot45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Chess_xot45.svg/52px-Chess_xot45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a2 black circle"><img alt="a2 black circle" src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Chess_xot45.svg/26px-Chess_xot45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Chess_xot45.svg/39px-Chess_xot45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5d/Chess_xot45.svg/52px-Chess_xot45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Black draws </div></div></div> <p>A bishop can make a fortress versus a rook and a <a href="/wiki/Bishop_pawn" class="mw-redirect" title="Bishop pawn">bishop pawn</a> on the sixth <a href="/wiki/Rank_(chess)" class="mw-redirect" title="Rank (chess)">rank</a>, if the bishop is on the color of the pawn's seventh rank square and the defending king is in front of the pawn. In this position, White would win if he had gotten the king to the sixth rank ahead of the pawn. Black draws by keeping the bishop on the diagonal from <i>a2</i> to <i>e6</i>, except when giving <a href="/wiki/Check_(chess)" title="Check (chess)">check</a>. The bishop keeps the white king off <i>e6</i> and checks him if he goes to <i>g6</i>, to drive him away. A possible continuation: </p> <dl><dd><b>1... Ba2 2. Kf4</b></dd></dl> <p>2.f7 is an interesting attempt, but then Black plays 2...Kg7! (not 2...Bxf7?? when White wins by playing 3.Kf6) and then 3...Bxf7, with a draw. 2...Kg7 prevents 3.Kf6, which would win. </p> <dl><dd><b>2... Bc4 3. Kg5 Bd5!</b></dd></dl> <p>The only move to draw, since the bishop must be able to check the king if it goes to g6. </p> <dl><dd><b>4. Rc7 Ba2! 5. Kg6 Bb1+! 6. Kh6 Ba2! 7. Ra7</b></dd></dl> <p>If 7.f7 Bxf7!: the pawn can be safely <dfn><a href="/wiki/Glossary_of_chess#capture" title="Glossary of chess"><span title="See entry at: Glossary of chess § capture" style="color:inherit;" class="glossary-link">captured</span></a></dfn> when the white king is on h6. </p> <dl><dd><b>7... Bc4</b></dd></dl> <p>Draw, because White cannot make progress.<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Defense_perimeter_(pawn_fortress)"><span id="Defense_perimeter_.28pawn_fortress.29"></span>Defense perimeter (pawn fortress)</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=19" title="Edit section: Defense perimeter (pawn fortress)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A <i>defense perimeter</i> is a drawing technique in which the side behind in <dfn><a href="/wiki/Glossary_of_chess#material" title="Glossary of chess"><span title="See entry at: Glossary of chess § material" style="color:inherit;" class="glossary-link">material</span></a></dfn> or otherwise at a disadvantage sets up a perimeter, largely or wholly composed of a pawn chain, that the opponent cannot penetrate. Unlike other forms of fortress, a defense perimeter can often be set up in the <a href="/wiki/Chess_middlegame" title="Chess middlegame">middlegame</a> with many pieces remaining on the board. </p> <div class="thumb noviewer tleft"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px"> </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d8 white bishop"><img alt="d8 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/22px-Chess_blt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/33px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/44px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 black rook"><img alt="b7 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/22px-Chess_rdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/33px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/44px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e7 black pawn"><img alt="e7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a6 black rook"><img alt="a6 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/22px-Chess_rdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/33px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/44px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 black pawn"><img alt="d6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f6 black pawn"><img alt="f6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a5 black bishop"><img alt="a5 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b5 black king"><img alt="b5 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c5 black pawn"><img alt="c5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e5 white pawn"><img alt="e5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 black pawn"><img alt="g5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b4 black pawn"><img alt="b4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d4 white pawn"><img alt="d4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f4 white pawn"><img alt="f4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g4 white pawn"><img alt="g4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h4 black pawn"><img alt="h4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a3 black pawn"><img alt="a3 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c3 white pawn"><img alt="c3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h3 white pawn"><img alt="h3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a2 white pawn"><img alt="a2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b2 white pawn"><img alt="b2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c2 white bishop"><img alt="c2 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/22px-Chess_blt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/33px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/44px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e2 white king"><img alt="e2 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">White, on move, forces a draw. </div></div></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px"> </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d8 black king"><img alt="d8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 black rook"><img alt="b7 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/22px-Chess_rdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/33px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/44px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e7 black pawn"><img alt="e7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a6 black rook"><img alt="a6 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/22px-Chess_rdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/33px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/44px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 black pawn"><img alt="d6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 white pawn"><img alt="e6 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f6 black pawn"><img alt="f6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a5 black bishop"><img alt="a5 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c5 black pawn"><img alt="c5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 white pawn"><img alt="d5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f5 white pawn"><img alt="f5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 black pawn"><img alt="g5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b4 black pawn"><img alt="b4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c4 white pawn"><img alt="c4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g4 white pawn"><img alt="g4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h4 black pawn"><img alt="h4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a3 black pawn"><img alt="a3 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b3 white pawn"><img alt="b3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h3 white pawn"><img alt="h3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a2 white pawn"><img alt="a2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e2 white king"><img alt="e2 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Black, ahead two rooks and a bishop, cannot breach White's defense perimeter. </div></div></div> <p>The position in the first diagram, a <a href="/wiki/Chess_problem" title="Chess problem">chess problem</a> by W.E. Rudolph (<i>La Strategie</i> 1912), illustrates the defense perimeter. White already has a huge material disadvantage, but forces a draw by giving up their remaining pieces to establish an impenetrable defense perimeter with their pawns. White draws with <b>1. Ba4+! Kxa4</b> (1... Kc4<a href="/wiki/Chess_annotation_symbols#??" title="Chess annotation symbols">??</a> 2. Bb3+! Kb5 3. c4+ Kc6 4. Ba4+!, forcing Rb5, wins for White) <b>2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+! Kxd8 6. f5!</b> (second diagram). Now Black is up two rooks and a bishop (normally an overwhelming material advantage) but has no hope of breaking through White's defense perimeter. The only winning attempts Black can make are to place their rooks on b5, c6, etc. and hope that White <dfn><a href="/wiki/Glossary_of_chess#capture" title="Glossary of chess"><span title="See entry at: Glossary of chess § capture" style="color:inherit;" class="glossary-link">captures</span></a></dfn> them. White draws by ignoring all such offers and simply shuffling their king about.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="thumb noviewer tleft"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Petrosian vs. Hazai </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c8 black king"><img alt="c8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a7 black queen"><img alt="a7 black queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/Chess_qdt45.svg/22px-Chess_qdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/Chess_qdt45.svg/33px-Chess_qdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/47/Chess_qdt45.svg/44px-Chess_qdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c7 black pawn"><img alt="c7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 black pawn"><img alt="d6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a5 black pawn"><img alt="a5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b5 white pawn"><img alt="b5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c5 black pawn"><img alt="c5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 white pawn"><img alt="d5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e5 black pawn"><img alt="e5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 black pawn"><img alt="g5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h5 black pawn"><img alt="h5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a4 white knight"><img alt="a4 white knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/22px-Chess_nlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/33px-Chess_nlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/44px-Chess_nlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c4 white pawn"><img alt="c4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e4 white pawn"><img alt="e4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f4 black pawn"><img alt="f4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a3 white pawn"><img alt="a3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f3 white pawn"><img alt="f3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g3 black bishop"><img alt="g3 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h3 white pawn"><img alt="h3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a2 white king"><img alt="a2 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b2 white queen"><img alt="b2 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/22px-Chess_qlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/33px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/44px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g2 white pawn"><img alt="g2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Black to play </div></div></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Petrosian vs. Hazai </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c8 black king"><img alt="c8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b6 black pawn"><img alt="b6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 black pawn"><img alt="d6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a5 black pawn"><img alt="a5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b5 white pawn"><img alt="b5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c5 black pawn"><img alt="c5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 white pawn"><img alt="d5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e5 black pawn"><img alt="e5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c4 white pawn"><img alt="c4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e4 white pawn"><img alt="e4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f4 black pawn"><img alt="f4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h4 black pawn"><img alt="h4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a3 white pawn"><img alt="a3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f3 white pawn"><img alt="f3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g3 black bishop"><img alt="g3 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h3 white pawn"><img alt="h3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a2 white king"><img alt="a2 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d2 white queen"><img alt="d2 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/22px-Chess_qlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/33px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/44px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">White cannot penetrate Black's fortress. </div></div></div> <p>The above example may seem fanciful, but Black achieved a similar defense perimeter in <a href="/wiki/Arshak_Petrosian" title="Arshak Petrosian">Arshak Petrosian</a>–Hazai, <a href="/wiki/Schilde" title="Schilde">Schilde</a> 1970<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> (first diagram) via a <a href="/wiki/Swindle_(chess)" title="Swindle (chess)">swindle</a>. Black has a difficult endgame, since White can attack and win his a-pawn by force, and he has no counterplay. Black tried the extraordinary <b>45... Qb6!?</b>, to which White replied with the obvious <b>46. Nxb6+?</b> This is actually a critical mistake, enabling Black to establish an impenetrable fortress. White should have carried out his plan of winning Black's a-pawn, for example with 46.Qc1 (threatening 47.Nxb6+ cxb6 48.h4! gxh4 49.Qh1 and Qh3, winning) Qa7 47.Qd2 followed by Kb3, Nc3, Ka4, and Na2–c1–b3. <b>46... cxb6</b> Now Black threatens 47...h4, locking down the entire board with his pawns, so White tries to break the position open. <b>47. h4 gxh4 48. Qd2 h3! 49. gxh3</b> Otherwise 49...h2 draws. <b>49... h4!</b> (second diagram) Black has established his fortress, and now can draw by simply moving his king around. The only way White could attempt to breach the fortress would be a queen sacrifice at some point (for example Qxa5 or Qxe5), but none of these give White winning chances as long as Black keeps his king near the center. The players shuffled their kings, and White's queen, around for six more moves before <a href="/wiki/Draw_by_agreement" title="Draw by agreement">agreeing to a draw</a>.<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="thumb noviewer tleft"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Smirin vs. HIARCS </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:22px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 black pawn"><img alt="b7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e7 black bishop"><img alt="e7 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g6 black king"><img alt="g6 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f5 black pawn"><img alt="f5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a4 black pawn"><img alt="a4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d4 white knight"><img alt="d4 white knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/22px-Chess_nlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/33px-Chess_nlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/44px-Chess_nlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e4 black bishop"><img alt="e4 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f4 white pawn"><img alt="f4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g4 black pawn"><img alt="g4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h4 black pawn"><img alt="h4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a3 white pawn"><img alt="a3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c3 white bishop"><img alt="c3 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/22px-Chess_blt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/33px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/44px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e3 white pawn"><img alt="e3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b2 white pawn"><img alt="b2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h2 white pawn"><img alt="h2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:154px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g1 white king"><img alt="g1 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Position after 46.Kg1: White envisions a pawn fortress. </div></div></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Smirin vs. HIARCS </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:22px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 black pawn"><img alt="b7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 black king"><img alt="e6 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f5 black pawn"><img alt="f5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a4 black pawn"><img alt="a4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b4 white pawn"><img alt="b4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e4 black bishop"><img alt="e4 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f4 white pawn"><img alt="f4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h4 black pawn"><img alt="h4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c3 white knight"><img alt="c3 white knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/22px-Chess_nlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/33px-Chess_nlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/44px-Chess_nlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e3 white pawn"><img alt="e3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g3 black pawn"><img alt="g3 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h3 white pawn"><img alt="h3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b2 white pawn"><img alt="b2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:154px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g1 white king"><img alt="g1 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Position after 51.Nc3: the fortress is complete. </div></div></div> <p>In <a href="/wiki/Ilya_Smirin" title="Ilya Smirin">Smirin</a>-<a href="/wiki/HIARCS" title="HIARCS">HIARCS</a>, Smirin-Computers match 2002,<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> the <a href="/wiki/International_Grandmaster#.22Super-grandmasters.22" class="mw-redirect" title="International Grandmaster">super-grandmaster</a> looked to be in trouble against the computer, which has the <dfn><a href="/wiki/Glossary_of_chess#bishop_pair" title="Glossary of chess"><span title="See entry at: Glossary of chess § bishop pair" style="color:inherit;" class="glossary-link">bishop pair</span></a></dfn>, can tie White's king down with ...g3, and threatens to invade with its king on the light squares. Smirin, however, saw that he could set up a fortress with his pawns. The game continued <b>46... g3 47. h3!</b> A surprising move, giving Black a formidable <a href="/wiki/Passed_pawn#Protected_passed_pawn" title="Passed pawn">protected passed pawn</a> on the sixth rank, but it begins to build White's fortress, keeping Black's king out of g4. <b>47... Bc5 48. Bb4!</b> Now Smirin gives HIARCS the choice between an <a href="/wiki/Opposite-colored_bishops_endgame" title="Opposite-colored bishops endgame">opposite-colored bishops endgame</a> (in which, moreover, White will play Be7 and win the h-pawn if Black's king comes to the center) and a bishop versus knight ending in which Smirin envisions a fortress. <b>48... Bxb4 49. axb4 Kf7</b> Black could try to prevent White's coming maneuver with 49...Bd3, but then White could play 50.Nf3 Kh5 (forced) 51.Nd4. <b>50. Nb5! Ke6 51. Nc3!</b> Completing the fortress. Now Black's king has no way in, and his bishop can do nothing, since White's king can prevent ...Bf1, attacking White's only pawn on a light square. The game concluded: <b>51... Bc2 52. Kg2 Kd6 53. Kg1 Kc6 54. Kg2 b5 55. Kg1 Bd3 56. Kg2 Be4+ 57. Kg1 Bc2 58. Kg2 Bd3 59. Kg1 Be4 60. Kf1 ½–½</b> </p> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading2"><h2 id="Other_examples">Other examples</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=20" title="Edit section: Other examples"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Here are some other drawing fortresses.<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Fortresses_against_a_bishop">Fortresses against a bishop</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=21" title="Edit section: Fortresses against a bishop"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tleft"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Müller & Pajeken </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:26px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a7 white bishop"><img alt="a7 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/26px-Chess_blt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/39px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/52px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 black king"><img alt="b7 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b6 white pawn"><img alt="b6 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c5 white king"><img alt="c5 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Draw </div></div></div> <div class="thumb noviewer tleft"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Müller & Pajeken </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b8 black king"><img alt="b8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a7 black pawn"><img alt="a7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a6 white pawn"><img alt="a6 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b5 white king"><img alt="b5 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 white bishop"><img alt="d5 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/26px-Chess_blt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/39px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/52px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Draw </div></div></div> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading3"><h3 id="Fortresses_against_a_knight">Fortresses against a knight</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=22" title="Edit section: Fortresses against a knight"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tleft"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px"> </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:26px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a7 black knight"><img alt="a7 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/26px-Chess_ndt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/39px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/52px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e2 white king"><img alt="e2 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h2 black pawn"><img alt="h2 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:182px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h1 black king"><img alt="h1 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">White draws with 1.Kf2! </div></div></div> <div class="thumb noviewer tleft"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px"> </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b8 black king"><img alt="b8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a7 black pawn"><img alt="a7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a6 white pawn"><img alt="a6 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c6 white king"><img alt="c6 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b5 white knight"><img alt="b5 white knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/26px-Chess_nlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/39px-Chess_nlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/52px-Chess_nlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Draw with either side to move </div></div></div> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading3"><h3 id="Fortresses_against_a_rook">Fortresses against a rook</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=23" title="Edit section: Fortresses against a rook"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tleft"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px"> </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g8 black king"><img alt="g8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 white rook"><img alt="b7 white rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/26px-Chess_rlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/39px-Chess_rlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/52px-Chess_rlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h7 black pawn"><img alt="h7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e6 white king"><img alt="e6 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g6 black pawn"><img alt="g6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c3 black bishop"><img alt="c3 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/26px-Chess_bdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/39px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/52px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g3 white pawn"><img alt="g3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h2 white pawn"><img alt="h2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Black to move draws with 1...h5! </div></div></div> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading2"><h2 id="Semi-fortress_in_two_bishops_vs._knight">Semi-fortress in two bishops vs. knight</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=24" title="Edit section: Semi-fortress in two bishops vs. knight"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1216972533"><div> <table class="col-begin" role="presentation" style="width: auto; float:right; clear:right;"> <tbody><tr> <td class="col-break"> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Kling & Horwitz, 1851 </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f8 white bishop"><img alt="f8 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/22px-Chess_blt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/33px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/44px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 black knight"><img alt="b7 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/22px-Chess_ndt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/33px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/44px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b6 black king"><img alt="b6 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 white king"><img alt="d5 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a4 white bishop"><img alt="a4 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/22px-Chess_blt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/33px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/44px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">This is a semi-fortress, but White wins in 45 moves. </div></div></div> </td> <td class="col-break"> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Lomonosov Tablebases </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f8 white king"><img alt="f8 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a7 black king"><img alt="a7 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a4 white knight"><img alt="a4 white knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/22px-Chess_nlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/33px-Chess_nlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/44px-Chess_nlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f2 white pawn"><img alt="f2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g2 white pawn"><img alt="g2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:154px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c1 black bishop"><img alt="c1 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:154px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h1 black bishop"><img alt="h1 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">White to move, although Black mates in 193. </div></div></div> <p>  </p> </td></tr></tbody></table></div> <p>The endgame of two bishops versus a knight was thought to be a draw for more than one hundred years. It was known that the temporary defensive fortress in this position could be broken down after a number of moves, but it was assumed that the fortress could be reformed in another corner. Computer <a href="/wiki/Endgame_tablebase" title="Endgame tablebase">endgame tablebases</a> show that the bishops generally win, but it takes up to 66 moves. It takes several moves to force Black out of the temporary fortress in the corner; then precise play with the bishops prevents Black from forming the fortress in another corner. The position in the diagram was thought to be a draw by <a href="/wiki/Josef_Kling" title="Josef Kling">Kling</a> and <a href="/wiki/Bernhard_Horwitz" title="Bernhard Horwitz">Horwitz</a> but computer analysis shows that White wins in 45 moves (either by checkmate or by winning the knight). All of the long wins in this endgame go through this type of semi-fortress position.<sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Pintér vs. Bronstein, 1977 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:26px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c7 black bishop"><img alt="c7 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/26px-Chess_bdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/39px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/52px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 black bishop"><img alt="d5 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/26px-Chess_bdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/39px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/52px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 black king"><img alt="g5 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e3 white king"><img alt="e3 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:182px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e1 white knight"><img alt="e1 white knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/26px-Chess_nlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/39px-Chess_nlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/52px-Chess_nlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Position before 68.Kd4 </div></div></div> <p>This game<sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> between <a href="/wiki/J%C3%B3zsef_Pint%C3%A9r" title="József Pintér">József Pintér</a> and <a href="/wiki/David_Bronstein" title="David Bronstein">David Bronstein</a> demonstrates the human play of the endgame. The defender has two ideas: (1) keep the king off the edge of the board and (2) keep the knight close to the king. White reaches the semi-fortress after <b>71. Nb2!</b>, which falls after <b>75... Kb5!</b>. White gets to a semi-fortress again in another corner after <b>90. Ng2+</b>. After <b>100. Ke3</b> White cannot hold that semi-fortress any longer, but forms one in another corner after <b>112. Nb7!</b>. On move 117 White claimed a <a href="/wiki/Draw_(chess)" title="Draw (chess)">draw</a> by the <a href="/wiki/Fifty_move_rule" class="mw-redirect" title="Fifty move rule">fifty move rule</a>.<sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="mw-heading mw-heading2"><h2 id="Positional_draw">Positional draw</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=25" title="Edit section: Positional draw"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Portisch vs. Kavalek, 1978 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:26px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d7 black knight"><img alt="d7 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/26px-Chess_ndt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/39px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/52px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 black king"><img alt="d6 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a5 white bishop"><img alt="a5 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/26px-Chess_blt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/39px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/52px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:0px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a4 white pawn"><img alt="a4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d4 white king"><img alt="d4 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b3 white pawn"><img alt="b3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">White to move </div></div></div> <p>A "positional draw" is a concept most commonly used in <a href="/wiki/Endgame_study" title="Endgame study">endgame studies</a> and describes an impasse other than <a href="/wiki/Stalemate" title="Stalemate">stalemate</a>. It usually involves the repetition of moves in which neither side can make progress or safely deviate. Typically a <dfn><a href="/wiki/Glossary_of_chess#material" title="Glossary of chess"><span title="See entry at: Glossary of chess § material" style="color:inherit;" class="glossary-link">material</span></a></dfn> advantage is balanced by a positional advantage. Fortresses and <a href="/wiki/Perpetual_check" title="Perpetual check">perpetual check</a> are examples of positional draws.<sup id="cite_ref-36" class="reference"><a href="#cite_note-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> Sometimes they salvage a draw from a position that seems hopeless because of a material deficit.<sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Grandmaster_(chess)" title="Grandmaster (chess)">Grandmaster</a> <a href="/wiki/John_Nunn" title="John Nunn">John Nunn</a> describes a positional draw as a position in which one side has enough material to normally win and he is not under direct attack, but some special feature of the position (often a <a href="/wiki/Blockade_(chess)" class="mw-redirect" title="Blockade (chess)">blockade</a>) prevents him from winning.<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> </p><p>A simple example is shown in the game between <a href="/wiki/Lajos_Portisch" title="Lajos Portisch">Lajos Portisch</a> and <a href="/wiki/Lubomir_Kavalek" title="Lubomir Kavalek">Lubomir Kavalek</a>. White could have won easily with 1.Be1 Kc6 2.b4. However, play continued <b>1. b4? Nb8 2. b5 Nc6+!</b> The only way to avoid the threatened 3...Nxa5 is 3.bxc6 Kxc6, but the resultant position is a draw because the bishop is on the wrong color to be able to force the <dfn><a href="/wiki/Glossary_of_chess#rook_pawn" title="Glossary of chess"><span title="See entry at: Glossary of chess § rook pawn" style="color:inherit;" class="glossary-link">rook pawn's</span></a></dfn> <a href="/wiki/Promotion_(chess)" title="Promotion (chess)">promotion</a> (see above, <a href="/wiki/Wrong_bishop" title="Wrong bishop">wrong bishop</a>, and <a href="/wiki/Wrong_rook_pawn" title="Wrong rook pawn">wrong rook pawn</a>).<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Pachman </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:78px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e5 black rook"><img alt="e5 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/26px-Chess_rdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/39px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/52px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f5 black king"><img alt="f5 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e4 black rook"><img alt="e4 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/26px-Chess_rdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/39px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/52px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d3 white bishop"><img alt="d3 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/26px-Chess_blt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/39px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/52px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f3 white king"><img alt="f3 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Either side to move </div></div></div> <p><a href="/wiki/Lud%C4%9Bk_Pachman" title="Luděk Pachman">Luděk Pachman</a> cites the endgame position in the diagram as a simple example of a positional draw. White on move simply plays waiting moves with the bishop (Bb1–c2–d3). As for Black, "If he is unwilling to allow the transition to the drawn ending of Rook versus Bishop, nothing else remains for him but to move his Rook at [e5] continuously up and down the [e-file]." Pachman explains, "The indecisive result here contradicts the principles concerning the value of the pieces and is caused by the bad position of the black pieces (pinned rook at [e4]).".<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Botvinnik vs. Keres, 1951 </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:26px;left:26px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b7 white rook"><img alt="b7 white rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/26px-Chess_rlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/39px-Chess_rlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/52px-Chess_rlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c7 white pawn"><img alt="c7 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f7 black knight"><img alt="f7 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/26px-Chess_ndt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/39px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/52px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g7 black king"><img alt="g7 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h7 black pawn"><img alt="h7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 black pawn"><img alt="d6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f6 black pawn"><img alt="f6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g6 black pawn"><img alt="g6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:78px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 white pawn"><img alt="d5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e5 black pawn"><img alt="e5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/26px-Chess_pdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/39px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/52px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e4 white pawn"><img alt="e4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:104px;left:130px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f4 white pawn"><img alt="f4 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c3 black rook"><img alt="c3 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/26px-Chess_rdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/39px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/52px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:130px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g3 white pawn"><img alt="g3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:156px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h2 white pawn"><img alt="h2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:182px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h1 white king"><img alt="h1 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Position after 52.c7, draw </div></div></div> <p>This position from a game between <a href="/wiki/Mikhail_Botvinnik" title="Mikhail Botvinnik">Mikhail Botvinnik</a> and <a href="/wiki/Paul_Keres" title="Paul Keres">Paul Keres</a> in the 1951 <a href="/wiki/USSR_Chess_Championship" title="USSR Chess Championship">USSR Championship</a> is drawn because the black king cannot get free and the rook must stay on the c-<dfn><a href="/wiki/Glossary_of_chess#file" title="Glossary of chess"><span title="See entry at: Glossary of chess § file" style="color:inherit;" class="glossary-link">file</span></a></dfn>. The players <a href="/wiki/Draw_by_agreement" title="Draw by agreement">agreed to a draw</a> four moves later.<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="thumb noviewer tleft"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Tal vs. Fischer, 1962 </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c8 black rook"><img alt="c8 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/22px-Chess_rdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/33px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/44px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f7 black pawn"><img alt="f7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h7 black king"><img alt="h7 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 black pawn"><img alt="d6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f6 white pawn"><img alt="f6 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 white pawn"><img alt="d5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 black pawn"><img alt="g5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e4 white rook"><img alt="e4 white rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/22px-Chess_rlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/33px-Chess_rlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/44px-Chess_rlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f4 black bishop"><img alt="f4 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h4 black pawn"><img alt="h4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h3 white pawn"><img alt="h3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g2 white pawn"><img alt="g2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:154px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b1 white rook"><img alt="b1 white rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/22px-Chess_rlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/33px-Chess_rlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/44px-Chess_rlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:154px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g1 white king"><img alt="g1 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Position after 47...Kh7 </div></div></div> <div class="thumb noviewer tleft"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Tal vs. Fischer </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:44px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d6 black pawn"><img alt="d6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f6 black king"><img alt="f6 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d5 white rook"><img alt="d5 white rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/22px-Chess_rlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/33px-Chess_rlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/44px-Chess_rlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 black pawn"><img alt="g5 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e4 white rook"><img alt="e4 white rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/22px-Chess_rlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/33px-Chess_rlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/72/Chess_rlt45.svg/44px-Chess_rlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f4 black bishop"><img alt="f4 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h4 black pawn"><img alt="h4 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:22px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="b3 black rook"><img alt="b3 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/22px-Chess_rdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/33px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/44px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h3 white pawn"><img alt="h3 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f2 white king"><img alt="f2 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g2 white pawn"><img alt="g2 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Final position, after 58.Re4 </div></div></div> <p>The first diagram shows a position from a game between former <a href="/wiki/World_Chess_Championship" title="World Chess Championship">World Champion</a> <a href="/wiki/Mikhail_Tal" title="Mikhail Tal">Mikhail Tal</a> and future World Champion <a href="/wiki/Bobby_Fischer" title="Bobby Fischer">Bobby Fischer</a> from the 1962 <a href="/wiki/Candidates_Tournament" title="Candidates Tournament">Candidates Tournament</a> in Curaçao.<sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> After 41 moves Tal had the advantage but Fischer <a href="/wiki/Sacrifice_(chess)" title="Sacrifice (chess)">sacrificed</a> <a href="/wiki/The_exchange_(chess)" title="The exchange (chess)">the exchange</a> (a rook for a knight). The game was drawn on the 58th move.<sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:254px">Benko vs. Bonin </div><div class="thumbinner" style="width:246px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/208px-Chessboard480.svg.png" decoding="async" width="208" height="208" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/312px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/416px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e8 black king"><img alt="e8 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/26px-Chess_kdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/39px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/52px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:26px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e7 black knight"><img alt="e7 black knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/26px-Chess_ndt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/39px-Chess_ndt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/Chess_ndt45.svg/52px-Chess_ndt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:52px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c6 black rook"><img alt="c6 black rook" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/26px-Chess_rdt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/39px-Chess_rdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Chess_rdt45.svg/52px-Chess_rdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:52px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c5 white pawn"><img alt="c5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:104px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e5 white queen"><img alt="e5 white queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/26px-Chess_qlt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/39px-Chess_qlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/Chess_qlt45.svg/52px-Chess_qlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:156px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 white pawn"><img alt="g5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/26px-Chess_plt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/39px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/52px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:78px;left:182px;width:26px;height:26px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h5 white king"><img alt="h5 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/26px-Chess_klt45.svg.png" decoding="async" width="26" height="26" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/39px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/52px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:26px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:26px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:26px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Draw </div></div></div> <p>In this position from a game between <a href="/wiki/Pal_Benko" title="Pal Benko">Pal Benko</a> and <a href="/wiki/International_Master" class="mw-redirect" title="International Master">International Master</a> Jay Bonin, White realized that the blockade cannot be broken and the game is a draw despite the extra material.<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> </p> <div style="clear:both;" class=""></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1216972533"><div> <table class="col-begin" role="presentation" style="width: auto; float:right; clear:right;"> <tbody><tr> <td class="col-break"> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Simkhovich, 1926 </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:0px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e8 white king"><img alt="e8 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:44px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="c7 black king"><img alt="c7 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e7 white bishop"><img alt="e7 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/22px-Chess_blt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/33px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/44px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f7 black pawn"><img alt="f7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h7 white knight"><img alt="h7 white knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/22px-Chess_nlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/33px-Chess_nlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/44px-Chess_nlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g6 black pawn"><img alt="g6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f5 white pawn"><img alt="f5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 white pawn"><img alt="g5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:110px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h3 black pawn"><img alt="h3 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a2 black bishop"><img alt="a2 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">White to play and draw </div></div></div> </td> <td class="col-break"> <div class="thumb noviewer tright"><div class="center" style="line-height:130%;margin:0 auto;max-width:222px">Simkhovich, 1926 </div><div class="thumbinner" style="width:214px"><table cellpadding="0" cellspacing="0" style="font-size:88%;border:1px #c8ccd1 solid;padding:0;margin:auto"><tbody><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td><td colspan="8" rowspan="8" style="padding:0;vertical-align:inherit"><div class="chess-board notheme" style="position:relative"><span class="notpageimage" typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/176px-Chessboard480.svg.png" decoding="async" width="176" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/264px-Chessboard480.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Chessboard480.svg/352px-Chessboard480.svg.png 2x" data-file-width="480" data-file-height="480" /></span></span><div style="position:absolute;z-index:3;top:22px;left:66px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="d7 black king"><img alt="d7 black king" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/22px-Chess_kdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/33px-Chess_kdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Chess_kdt45.svg/44px-Chess_kdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f7 black pawn"><img alt="f7 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g7 white king"><img alt="g7 white king" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/22px-Chess_klt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/33px-Chess_klt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/42/Chess_klt45.svg/44px-Chess_klt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:22px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h7 white knight"><img alt="h7 white knight" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/22px-Chess_nlt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/33px-Chess_nlt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Chess_nlt45.svg/44px-Chess_nlt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:110px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="f6 white pawn"><img alt="f6 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g6 black pawn"><img alt="g6 black pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/22px-Chess_pdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/33px-Chess_pdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Chess_pdt45.svg/44px-Chess_pdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:44px;left:154px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="h6 white bishop"><img alt="h6 white bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/22px-Chess_blt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/33px-Chess_blt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Chess_blt45.svg/44px-Chess_blt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:66px;left:132px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="g5 white pawn"><img alt="g5 white pawn" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/22px-Chess_plt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/33px-Chess_plt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Chess_plt45.svg/44px-Chess_plt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:88px;left:88px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="e4 black queen"><img alt="e4 black queen" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/Chess_qdt45.svg/22px-Chess_qdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/47/Chess_qdt45.svg/33px-Chess_qdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/47/Chess_qdt45.svg/44px-Chess_qdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div><div style="position:absolute;z-index:3;top:132px;left:0px;width:22px;height:22px"><span class="mw-valign-top notpageimage" typeof="mw:File"><span title="a2 black bishop"><img alt="a2 black bishop" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/22px-Chess_bdt45.svg.png" decoding="async" width="22" height="22" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/33px-Chess_bdt45.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/98/Chess_bdt45.svg/44px-Chess_bdt45.svg.png 2x" data-file-width="45" data-file-height="45" /></span></span></div></div></td><td style="padding:0;vertical-align:inherit;text-align:center;width:18px;height:22px">8</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">7</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">6</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">5</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">4</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">3</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">2</td></tr><tr style="vertical-align:middle"><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td><td style="padding:0;vertical-align:inherit;text-align:center;height:22px">1</td></tr><tr style="vertical-align:middle"><td style="vertical-align:inherit;padding:0"></td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">a</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">b</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">c</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">d</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">e</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">f</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">g</td><td style="padding:0;vertical-align:inherit;text-align:center;height:18px;width:22px">h</td><td style="vertical-align:inherit;padding:0"></td></tr></tbody></table><div class="thumbcaption">Positional draw </div></div></div> <p>  </p> </td></tr></tbody></table></div> <p>The position looks lost for White, as he cannot stop the h-pawn from <a href="/wiki/Promotion_(chess)" title="Promotion (chess)">queening</a>, but he does have a defence which seems to defy the rules of logic. White will calmly construct a "fortress" which will hide his pieces from attack. The only weakness in White's "fortress" is the g-pawn. This pawn has to be defended by the bishop and the only square where this can be done safely is from h6. </p><p><b>1. Bf6!</b> White threatens to stop the advance of the h-pawn with ...Be5+; building the fortress immediately does not work: 1.f6? h2 2.Kf8 h1=Q 3.Kg7 (3.Kg8 Qg2 4.Bf8 Qa8 5.Kg7 Kd7 6.Kg8 Ke6 7.Kg7 Kf5 8.Kg8 Bb3 9.Kg7 Qh1−+) 3...Kd7 4.Bb4 Ke6 5.Bd2 Kf5 6.Be3 Qf3 7.Bd2 Qe2 8.Bc1 Qd1 9.Be3 Qd3 10.Bc1 Qc3−+; <b>1... Kd6 2. Be7+ </b> 2.fxg6? This move destroys the fortress 2...fxg6 3.Be7+ Kc6−+. <b>2...Kc6</b> 2... Ke5 White draws without a fortress after 3.fxg6 fxg6 4.Bd8 Kd6 5.Nf6! h2 6.Ne4+ Ke6 7.Nf2 Bd5 8.Bf6 h1=Q 9.Nxh1 Bxh1=; <b>3. f6!</b> Chess computer programs have difficulty assessing "fortress" positions because the normal values for the pieces do not apply. White has achieved the closing of the long diagonal a8–h1. The only way to avoid this would be for Black to repeat moves. Now White can build his "fortress" without the worry of the queen getting to the back rank via the long diagonal. <b>3...h2 4. Bf8! h1=Q 5. Bh6!</b> with the idea of 6.Kf8 and 7.Kg7. White will be safe behind the barrier of pawns. It is a positional draw. </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Fortress_(chess)&action=edit&section=26" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">(<a href="#CITEREFMüllerPajeken2008">Müller & Pajeken 2008</a>:183)</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text">(<a href="#CITEREFde_la_Villa2008">de la Villa 2008</a>:23)</span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text">(<a href="#CITEREFGuidBratko2012">Guid & Bratko 2012</a>:35)</span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text">(<a href="#CITEREFMüllerPajeken2008">Müller & Pajeken 2008</a>:183)</span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text">(<a href="#CITEREFMüllerPajeken2008">Müller & Pajeken 2008</a>:189)</span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.chessgames.com/perl/chessgame?gid=1324924">Serper vs. Nakamura 2004</a></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text">(<a href="#CITEREFMednis1982">Mednis 1982</a>:15–17)</span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text">(<a href="#CITEREFSeirawan2003">Seirawan 2003</a>:200–201)</span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text">(<a href="#CITEREFde_la_Villa2008">de la Villa 2008</a>:25)</span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text">(<a href="#CITEREFSnape2003">Snape 2003</a>:91)</span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text">(<a href="#CITEREFGrivas2008">Grivas 2008</a>:297)</span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text">(<a href="#CITEREFNunn2010">Nunn 2010</a>:180–81)</span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text">(<a href="#CITEREFWhitakerHartleb1960">Whitaker & Hartleb 1960</a>)</span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.chessgames.com/perl/nph-chesspgn?text=1&gid=1120758">Salov vs. Korchnoi</a></span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</a></b></span> <span class="reference-text">(<a href="#CITEREFDvoretsky2006">Dvoretsky 2006</a>:92)</span> </li> <li id="cite_note-16"><span class="mw-cite-backlink"><b><a href="#cite_ref-16">^</a></b></span> <span class="reference-text">(<a href="#CITEREFMüllerPajeken2008">Müller & Pajeken 2008</a>:191)</span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-17">^</a></b></span> <span class="reference-text">(<a href="#CITEREFDvoretsky2006">Dvoretsky 2006</a>:289)</span> </li> <li id="cite_note-18"><span class="mw-cite-backlink"><b><a href="#cite_ref-18">^</a></b></span> <span class="reference-text">(<a href="#CITEREFMüllerLamprecht2001">Müller & Lamprecht 2001</a>:339–41)</span> </li> <li id="cite_note-19"><span class="mw-cite-backlink"><b><a href="#cite_ref-19">^</a></b></span> <span class="reference-text">(<a href="#CITEREFMüllerLamprecht2001">Müller & Lamprecht 2001</a>:340–41, 401)</span> </li> <li id="cite_note-20"><span class="mw-cite-backlink"><b><a href="#cite_ref-20">^</a></b></span> <span class="reference-text">(<a href="#CITEREFMüllerLamprecht2001">Müller & Lamprecht 2001</a>:339–41).</span> </li> <li id="cite_note-21"><span class="mw-cite-backlink"><b><a href="#cite_ref-21">^</a></b></span> <span class="reference-text">(<a href="#CITEREFNunn2002">Nunn 2002</a>:300ff)</span> </li> <li id="cite_note-22"><span class="mw-cite-backlink"><b><a href="#cite_ref-22">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.chessgames.com/perl/chessgame?gid=1058738">Ree vs. Hort</a></span> </li> <li id="cite_note-23"><span class="mw-cite-backlink"><b><a href="#cite_ref-23">^</a></b></span> <span class="reference-text">(<a href="#CITEREFDvoretsky2006">Dvoretsky 2006</a>:315)</span> </li> <li id="cite_note-24"><span class="mw-cite-backlink"><b><a href="#cite_ref-24">^</a></b></span> <span class="reference-text">(<a href="#CITEREFLasker1951">Lasker 1951</a>:314–15)</span> </li> <li id="cite_note-25"><span class="mw-cite-backlink"><b><a href="#cite_ref-25">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.chessgames.com/perl/chessgame?gid=1272756">Em. Lasker vs. Ed. Lasker</a></span> </li> <li id="cite_note-26"><span class="mw-cite-backlink"><b><a href="#cite_ref-26">^</a></b></span> <span class="reference-text">(<a href="#CITEREFde_la_Villa2008">de la Villa 2008</a>:219–21)</span> </li> <li id="cite_note-27"><span class="mw-cite-backlink"><b><a href="#cite_ref-27">^</a></b></span> <span class="reference-text">(<a href="#CITEREFKmoch1959">Kmoch 1959</a>:174–75)</span> </li> <li id="cite_note-28"><span class="mw-cite-backlink"><b><a href="#cite_ref-28">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.chessgames.com/perl/chessgame?gid=1281614">A. Petrosian vs. Hazai</a></span> </li> <li id="cite_note-29"><span class="mw-cite-backlink"><b><a href="#cite_ref-29">^</a></b></span> <span class="reference-text">(<a href="#CITEREFMüllerPajeken2008">Müller & Pajeken 2008</a>:200)</span> </li> <li id="cite_note-30"><span class="mw-cite-backlink"><b><a href="#cite_ref-30">^</a></b></span> <span class="reference-text">(<a href="#CITEREFSoltis1975">Soltis 1975</a>:249–50)</span> </li> <li id="cite_note-31"><span class="mw-cite-backlink"><b><a href="#cite_ref-31">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.chessgames.com/perl/chessgame?gid=1349974">Smirin vs. HIARCS</a></span> </li> <li id="cite_note-32"><span class="mw-cite-backlink"><b><a href="#cite_ref-32">^</a></b></span> <span class="reference-text">(<a href="#CITEREFMüllerPajeken2008">Müller & Pajeken 2008</a>:183–215)</span> </li> <li id="cite_note-33"><span class="mw-cite-backlink"><b><a href="#cite_ref-33">^</a></b></span> <span class="reference-text">(<a href="#CITEREFNunn1995">Nunn 1995</a>:265ff)</span> </li> <li id="cite_note-34"><span class="mw-cite-backlink"><b><a href="#cite_ref-34">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.chessgames.com/perl/chessgame?gid=1452153">Pintér vs. Bronstein</a></span> </li> <li id="cite_note-35"><span class="mw-cite-backlink"><b><a href="#cite_ref-35">^</a></b></span> <span class="reference-text">(<a href="#CITEREFBenko2007">Benko 2007</a>:132–34, 137)</span> </li> <li id="cite_note-36"><span class="mw-cite-backlink"><b><a href="#cite_ref-36">^</a></b></span> <span class="reference-text">(<a href="#CITEREFHooperWhyld1992">Hooper & Whyld 1992</a>)</span> </li> <li id="cite_note-37"><span class="mw-cite-backlink"><b><a href="#cite_ref-37">^</a></b></span> <span class="reference-text">(<a href="#CITEREFGiddins2007">Giddins 2007</a>:111)</span> </li> <li id="cite_note-38"><span class="mw-cite-backlink"><b><a href="#cite_ref-38">^</a></b></span> <span class="reference-text">(<a href="#CITEREFNunn1981">Nunn 1981</a>:68)</span> </li> <li id="cite_note-39"><span class="mw-cite-backlink"><b><a href="#cite_ref-39">^</a></b></span> <span class="reference-text">(<a href="#CITEREFBeliavskyMikhalchishin2003">Beliavsky & Mikhalchishin 2003</a>:130–35)</span> </li> <li id="cite_note-40"><span class="mw-cite-backlink"><b><a href="#cite_ref-40">^</a></b></span> <span class="reference-text">(<a href="#CITEREFPachman1973">Pachman 1973</a>:186–87)</span> </li> <li id="cite_note-41"><span class="mw-cite-backlink"><b><a href="#cite_ref-41">^</a></b></span> <span class="reference-text">(<a href="#CITEREFGiddins2007">Giddins 2007</a>:111)</span> </li> <li id="cite_note-42"><span class="mw-cite-backlink"><b><a href="#cite_ref-42">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.chessgames.com/perl/chessgame?gid=1044571">Tal vs. Fischer 1962</a></span> </li> <li id="cite_note-43"><span class="mw-cite-backlink"><b><a href="#cite_ref-43">^</a></b></span> <span class="reference-text">(<a href="#CITEREFTimman2005">Timman 2005</a>:55–56)</span> </li> <li id="cite_note-44"><span class="mw-cite-backlink"><b><a href="#cite_ref-44">^</a></b></span> <span class="reference-text">(<a href="#CITEREFBenko2009">Benko 2009</a>:40)</span> </li> </ol></div> <p><b>Bibliography</b> </p> <style data-mw-deduplicate="TemplateStyles:r1239549316">.mw-parser-output .refbegin{margin-bottom:0.5em}.mw-parser-output .refbegin-hanging-indents>ul{margin-left:0}.mw-parser-output .refbegin-hanging-indents>ul>li{margin-left:0;padding-left:3.2em;text-indent:-3.2em}.mw-parser-output .refbegin-hanging-indents ul,.mw-parser-output .refbegin-hanging-indents ul li{list-style:none}@media(max-width:720px){.mw-parser-output .refbegin-hanging-indents>ul>li{padding-left:1.6em;text-indent:-1.6em}}.mw-parser-output .refbegin-columns{margin-top:0.3em}.mw-parser-output .refbegin-columns ul{margin-top:0}.mw-parser-output .refbegin-columns li{page-break-inside:avoid;break-inside:avoid-column}@media screen{.mw-parser-output .refbegin{font-size:90%}}</style><div class="refbegin refbegin-columns references-column-width" style="column-width: 30em"> <ul><li><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFBeliavskyMikhalchishin2003" class="citation cs2"><a href="/wiki/Alexander_Beliavsky" title="Alexander Beliavsky">Beliavsky, Alexander</a>; <a href="/wiki/Adrian_Mikhalchishin" title="Adrian Mikhalchishin">Mikhalchishin, Adrian</a> (2003), <i>Modern Endgame Practice</i>, Batsford, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-7134-8740-2" title="Special:BookSources/0-7134-8740-2"><bdi>0-7134-8740-2</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Modern+Endgame+Practice&rft.pub=Batsford&rft.date=2003&rft.isbn=0-7134-8740-2&rft.aulast=Beliavsky&rft.aufirst=Alexander&rft.au=Mikhalchishin%2C+Adrian&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBenko2007" class="citation cs2"><a href="/wiki/Pal_Benko" title="Pal Benko">Benko, Pal</a> (2007), <i>Pal Benko's Endgame Laboratory</i>, Ishi Press, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-923891-88-6" title="Special:BookSources/978-0-923891-88-6"><bdi>978-0-923891-88-6</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Pal+Benko%27s+Endgame+Laboratory&rft.pub=Ishi+Press&rft.date=2007&rft.isbn=978-0-923891-88-6&rft.aulast=Benko&rft.aufirst=Pal&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBenko2009" class="citation cs2">Benko, Pal (August 2009), "Endgame Lab", <i><a href="/wiki/Chess_Life" title="Chess Life">Chess Life</a></i> (8): 40–41</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Chess+Life&rft.atitle=Endgame+Lab&rft.issue=8&rft.pages=40-41&rft.date=2009-08&rft.aulast=Benko&rft.aufirst=Pal&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFde_la_Villa2008" class="citation cs2"><a href="/wiki/Jes%C3%BAs_de_la_Villa" title="Jesús de la Villa">de la Villa, Jesús</a> (2008), <i>100 Endgames You Must Know</i>, <a href="/wiki/New_in_Chess" class="mw-redirect" title="New in Chess">New in Chess</a>, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-90-5691-244-4" title="Special:BookSources/978-90-5691-244-4"><bdi>978-90-5691-244-4</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=100+Endgames+You+Must+Know&rft.pub=New+in+Chess&rft.date=2008&rft.isbn=978-90-5691-244-4&rft.aulast=de+la+Villa&rft.aufirst=Jes%C3%BAs&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFDvoretsky2006" class="citation cs2"><a href="/wiki/Mark_Dvoretsky" title="Mark Dvoretsky">Dvoretsky, Mark</a> (2006), <i>Dvoretsky's Endgame Manual</i> (2nd ed.), Russell Enterprises, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/1-888690-28-3" title="Special:BookSources/1-888690-28-3"><bdi>1-888690-28-3</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Dvoretsky%27s+Endgame+Manual&rft.edition=2nd&rft.pub=Russell+Enterprises&rft.date=2006&rft.isbn=1-888690-28-3&rft.aulast=Dvoretsky&rft.aufirst=Mark&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGiddins2007" class="citation cs2"><a href="/wiki/Stephen_Giddins" class="mw-redirect" title="Stephen Giddins">Giddins, Steve</a> (2007), <i>101 Chess Endgame Tips: Golden nuggets of endgame wisdom</i>, Gambit Publications, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-904600-66-4" title="Special:BookSources/978-1-904600-66-4"><bdi>978-1-904600-66-4</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=101+Chess+Endgame+Tips%3A+Golden+nuggets+of+endgame+wisdom&rft.pub=Gambit+Publications&rft.date=2007&rft.isbn=978-1-904600-66-4&rft.aulast=Giddins&rft.aufirst=Steve&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGrivas2008" class="citation cs2"><a href="/wiki/Efstratios_Grivas" title="Efstratios Grivas">Grivas, Efstratios</a> (2008), <i>Practical Endgame Play - mastering the basics</i>, <a href="/wiki/Everyman_Chess" title="Everyman Chess">Everyman Chess</a>, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-85744-556-5" title="Special:BookSources/978-1-85744-556-5"><bdi>978-1-85744-556-5</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Practical+Endgame+Play+-+mastering+the+basics&rft.pub=Everyman+Chess&rft.date=2008&rft.isbn=978-1-85744-556-5&rft.aulast=Grivas&rft.aufirst=Efstratios&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGuidBratko2012" class="citation cs2">Guid, Matej; <a href="/wiki/Ivan_Bratko_(computer_scientist)" title="Ivan Bratko (computer scientist)">Bratko, Ivan</a> (2012), <a rel="nofollow" class="external text" href="http://www.ailab.si/matej/doc/Detecting_Fortresses_in_Chess.pdf">"Detecting Fortresses in Chess"</a> <span class="cs1-format">(PDF)</span>, <i>Elektrotehniški vestnik</i>, <b>79</b> (1–2), Faculty of Computer and Information Science, <a href="/wiki/University_of_Ljubljana" title="University of Ljubljana">University of Ljubljana</a>: 35–40<span class="reference-accessdate">, retrieved <span class="nowrap">2014-01-28</span></span></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Elektrotehni%C5%A1ki+vestnik&rft.atitle=Detecting+Fortresses+in+Chess&rft.volume=79&rft.issue=1%E2%80%932&rft.pages=35-40&rft.date=2012&rft.aulast=Guid&rft.aufirst=Matej&rft.au=Bratko%2C+Ivan&rft_id=http%3A%2F%2Fwww.ailab.si%2Fmatej%2Fdoc%2FDetecting_Fortresses_in_Chess.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHooperWhyld1992" class="citation cs2"><a href="/wiki/David_Vincent_Hooper" title="David Vincent Hooper">Hooper, David</a>; <a href="/wiki/Kenneth_Whyld" class="mw-redirect" title="Kenneth Whyld">Whyld, Kenneth</a> (1992), <i><a href="/wiki/The_Oxford_Companion_to_Chess" title="The Oxford Companion to Chess">The Oxford Companion to Chess</a></i> (2nd ed.), Oxford University Press, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-19-280049-3" title="Special:BookSources/0-19-280049-3"><bdi>0-19-280049-3</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Oxford+Companion+to+Chess&rft.edition=2nd&rft.pub=Oxford+University+Press&rft.date=1992&rft.isbn=0-19-280049-3&rft.aulast=Hooper&rft.aufirst=David&rft.au=Whyld%2C+Kenneth&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKmoch1959" class="citation cs2"><a href="/wiki/Hans_Kmoch" title="Hans Kmoch">Kmoch, Hans</a> (1959), <i>Pawn Power in Chess</i>, David McKay</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Pawn+Power+in+Chess&rft.pub=David+McKay&rft.date=1959&rft.aulast=Kmoch&rft.aufirst=Hans&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFLasker1951" class="citation cs2"><a href="/wiki/Edward_Lasker" title="Edward Lasker">Lasker, Edward</a> (1951), <i>Chess Secrets</i>, David McKay</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Chess+Secrets&rft.pub=David+McKay&rft.date=1951&rft.aulast=Lasker&rft.aufirst=Edward&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMednis1982" class="citation cs2"><a href="/wiki/Edmar_Mednis" title="Edmar Mednis">Mednis, Edmar</a> (1982), <i>Practical Rook Endings</i>, Chess Enterprises, Inc., <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-931462-16-9" title="Special:BookSources/0-931462-16-9"><bdi>0-931462-16-9</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Practical+Rook+Endings&rft.pub=Chess+Enterprises%2C+Inc.&rft.date=1982&rft.isbn=0-931462-16-9&rft.aulast=Mednis&rft.aufirst=Edmar&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMüllerLamprecht2001" class="citation cs2"><a href="/wiki/Karsten_M%C3%BCller" title="Karsten Müller">Müller, Karsten</a>; <a href="/wiki/Frank_Lamprecht" title="Frank Lamprecht">Lamprecht, Frank</a> (2001), <i>Fundamental Chess Endings</i>, <a href="/wiki/Gambit_Publications" title="Gambit Publications">Gambit Publications</a>, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/1-901983-53-6" title="Special:BookSources/1-901983-53-6"><bdi>1-901983-53-6</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Fundamental+Chess+Endings&rft.pub=Gambit+Publications&rft.date=2001&rft.isbn=1-901983-53-6&rft.aulast=M%C3%BCller&rft.aufirst=Karsten&rft.au=Lamprecht%2C+Frank&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMüllerPajeken2008" class="citation cs2">Müller, Karsten; Pajeken, Wolfgang (2008), <i>How to Play Chess Endings</i>, Gambit Publications, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-904600-86-2" title="Special:BookSources/978-1-904600-86-2"><bdi>978-1-904600-86-2</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=How+to+Play+Chess+Endings&rft.pub=Gambit+Publications&rft.date=2008&rft.isbn=978-1-904600-86-2&rft.aulast=M%C3%BCller&rft.aufirst=Karsten&rft.au=Pajeken%2C+Wolfgang&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span> (chapter 11 gives extensive coverage to fortresses)</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNunn1981" class="citation cs2"><a href="/wiki/John_Nunn" title="John Nunn">Nunn, John</a> (1981), <i>Tactical Chess Endings</i>, Batsford, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-7134-5937-9" title="Special:BookSources/0-7134-5937-9"><bdi>0-7134-5937-9</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Tactical+Chess+Endings&rft.pub=Batsford&rft.date=1981&rft.isbn=0-7134-5937-9&rft.aulast=Nunn&rft.aufirst=John&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNunn1995" class="citation cs2">Nunn, John (1995), <i>Secrets of Minor-Piece Endings</i>, Batsford, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-8050-4228-8" title="Special:BookSources/0-8050-4228-8"><bdi>0-8050-4228-8</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Secrets+of+Minor-Piece+Endings&rft.pub=Batsford&rft.date=1995&rft.isbn=0-8050-4228-8&rft.aulast=Nunn&rft.aufirst=John&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNunn2002" class="citation cs2">Nunn, John (2002), <i>Secrets of Pawnless Endings</i>, Gambit Publications, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/1-901983-65-X" title="Special:BookSources/1-901983-65-X"><bdi>1-901983-65-X</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Secrets+of+Pawnless+Endings&rft.pub=Gambit+Publications&rft.date=2002&rft.isbn=1-901983-65-X&rft.aulast=Nunn&rft.aufirst=John&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNunn2010" class="citation cs2">Nunn, John (2010), <i>Nunn's Chess Endings, volume 2</i>, Gambit Publications, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-906454-23-4" title="Special:BookSources/978-1-906454-23-4"><bdi>978-1-906454-23-4</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Nunn%27s+Chess+Endings%2C+volume+2&rft.pub=Gambit+Publications&rft.date=2010&rft.isbn=978-1-906454-23-4&rft.aulast=Nunn&rft.aufirst=John&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPachman1973" class="citation cs2"><a href="/wiki/Lud%C4%9Bk_Pachman" title="Luděk Pachman">Pachman, Luděk</a> (1973), <i>Attack and Defense in Modern Chess Tactics</i>, David McKay</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Attack+and+Defense+in+Modern+Chess+Tactics&rft.pub=David+McKay&rft.date=1973&rft.aulast=Pachman&rft.aufirst=Lud%C4%9Bk&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSeirawan2003" class="citation cs2"><a href="/wiki/Yasser_Seirawan" title="Yasser Seirawan">Seirawan, Yasser</a> (2003), <i>Winning Chess Endings</i>, Everyman Chess, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/1-85744-348-9" title="Special:BookSources/1-85744-348-9"><bdi>1-85744-348-9</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Winning+Chess+Endings&rft.pub=Everyman+Chess&rft.date=2003&rft.isbn=1-85744-348-9&rft.aulast=Seirawan&rft.aufirst=Yasser&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSnape2003" class="citation cs2">Snape, Ian (2003), <i>Chess Endings Made Simple: How to Approach the Endgame with Confidence</i>, Gambit Publications, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/1-901983-97-8" title="Special:BookSources/1-901983-97-8"><bdi>1-901983-97-8</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Chess+Endings+Made+Simple%3A+How+to+Approach+the+Endgame+with+Confidence&rft.pub=Gambit+Publications&rft.date=2003&rft.isbn=1-901983-97-8&rft.aulast=Snape&rft.aufirst=Ian&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSoltis1975" class="citation cs2"><a href="/wiki/Andrew_Soltis" title="Andrew Soltis">Soltis, Andrew</a> (1975), <i>The Art of Defense in Chess</i>, David McKay, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-679-13043-8" title="Special:BookSources/0-679-13043-8"><bdi>0-679-13043-8</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Art+of+Defense+in+Chess&rft.pub=David+McKay&rft.date=1975&rft.isbn=0-679-13043-8&rft.aulast=Soltis&rft.aufirst=Andrew&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFTimman2005" class="citation cs2"><a href="/wiki/Jan_Timman" title="Jan Timman">Timman, Jan</a> (2005), <i>Curaçao 1962: The Battle of Minds that Shook the Chess World</i>, <a href="/wiki/New_in_Chess" class="mw-redirect" title="New in Chess">New in Chess</a>, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/90-5691-139-2" title="Special:BookSources/90-5691-139-2"><bdi>90-5691-139-2</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Cura%C3%A7ao+1962%3A+The+Battle+of+Minds+that+Shook+the+Chess+World&rft.pub=New+in+Chess&rft.date=2005&rft.isbn=90-5691-139-2&rft.aulast=Timman&rft.aufirst=Jan&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFWhitakerHartleb1960" class="citation cs2"><a href="/wiki/Norman_T._Whitaker" title="Norman T. Whitaker">Whitaker, Norman T.</a>; Hartleb, Glenn E. (1960), <i>365 Selected Endings: One For Each Day of the Year</i>, <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-923891-84-6" title="Special:BookSources/0-923891-84-6"><bdi>0-923891-84-6</bdi></a></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=365+Selected+Endings%3A+One+For+Each+Day+of+the+Year&rft.date=1960&rft.isbn=0-923891-84-6&rft.aulast=Whitaker&rft.aufirst=Norman+T.&rft.au=Hartleb%2C+Glenn+E.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AFortress+%28chess%29" class="Z3988"></span></li></ul> </div> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output 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href="/wiki/Template:Chess" title="Template:Chess"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Chess" title="Template talk:Chess"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Chess" title="Special:EditPage/Template:Chess"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Chess" style="font-size:114%;margin:0 4em"><a href="/wiki/Chess" title="Chess">Chess</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Outline_of_chess" title="Outline of chess">Outline</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Chess_theory" title="Chess theory">Chess theory</a></li> <li><a href="/wiki/Chess_title" title="Chess title">Chess titles</a> <ul><li><a href="/wiki/Grandmaster_(chess)" title="Grandmaster (chess)">Grandmaster</a></li></ul></li> <li><a href="/wiki/Computer_chess" title="Computer chess">Computer chess</a> <ul><li><a href="/wiki/Glossary_of_computer_chess_terms" title="Glossary of computer chess terms">glossary</a></li> <li><a href="/wiki/Human%E2%80%93computer_chess_matches" title="Human–computer chess matches">matches</a></li> <li><a href="/wiki/Chess_engine" title="Chess engine">engines</a></li> <li><a href="/wiki/List_of_chess_software" title="List of chess software">software</a></li></ul></li> <li><a href="/wiki/Correspondence_chess" title="Correspondence chess">Correspondence chess</a></li> <li><a href="/wiki/FIDE" title="FIDE">FIDE</a></li> <li><a href="/wiki/Glossary_of_chess" title="Glossary of chess">Glossary</a></li> <li><a href="/wiki/Online_chess" title="Online chess">Online chess</a> <ul><li><a href="/wiki/Premove" title="Premove">Premove</a></li> <li><a href="/wiki/Internet_chess_server" title="Internet chess server">Internet chess server</a> <ul><li><a href="/wiki/List_of_Internet_chess_servers" title="List of Internet chess servers">list</a></li></ul></li></ul></li> <li><a href="/wiki/Chess_rating_system" title="Chess rating system">Rating system</a> <ul><li><a href="/wiki/FIDE_world_rankings" class="mw-redirect" title="FIDE world rankings">world rankings</a></li> <li><a href="/wiki/Norm_(chess)" title="Norm (chess)">norms</a></li></ul></li> <li><a href="/wiki/Chess_variant" title="Chess variant">Variants</a> <ul><li><a href="/wiki/List_of_chess_variants" title="List of chess variants">List</a></li></ul></li> <li><a href="/wiki/List_of_world_records_in_chess" title="List of world records in chess">World records</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Chess_equipment" title="Chess equipment">Equipment</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Chess_set" title="Chess set">Chess set</a> <ul><li><a href="/wiki/Chessboard" title="Chessboard">chessboard</a></li> <li><a href="/wiki/Dubrovnik_chess_set" title="Dubrovnik chess set">Dubrovnik chess set</a></li> <li><a href="/wiki/Staunton_chess_set" title="Staunton chess set">Staunton chess set</a></li></ul></li> <li><a href="/wiki/Chess_piece" title="Chess piece">Chess pieces</a> <ul><li><a href="/wiki/King_(chess)" title="King (chess)">King</a></li> <li><a href="/wiki/Queen_(chess)" title="Queen (chess)">Queen</a></li> <li><a href="/wiki/Rook_(chess)" title="Rook (chess)">Rook</a></li> <li><a href="/wiki/Bishop_(chess)" title="Bishop (chess)">Bishop</a></li> <li><a href="/wiki/Knight_(chess)" title="Knight (chess)">Knight</a></li> <li><a href="/wiki/Pawn_(chess)" title="Pawn (chess)">Pawn</a></li> <li><a href="/wiki/Fairy_chess_piece" title="Fairy chess piece">Fairy</a></li></ul></li> <li><a href="/wiki/Chess_clock" title="Chess clock">Chess clock</a></li> <li><a href="/wiki/Chess_table" title="Chess table">Chess table</a></li> <li><dfn><a href="/wiki/Glossary_of_chess#score_sheets" title="Glossary of chess"><span title="See entry at: Glossary of chess § Score sheets" style="color:inherit;" class="glossary-link">Score sheets</span></a></dfn></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/History_of_chess" title="History of chess">History</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Timeline_of_chess" title="Timeline of chess">Timeline</a> <ul><li><i><a href="/wiki/Versus_de_scachis" title="Versus de scachis">Versus de scachis</a></i></li> <li><i><a href="/wiki/G%C3%B6ttingen_manuscript" title="Göttingen manuscript">Göttingen manuscript</a></i></li> <li><a href="/wiki/Charlemagne_chessmen" title="Charlemagne chessmen">Charlemagne chessmen</a></li> <li><a href="/wiki/Lewis_chessmen" title="Lewis chessmen">Lewis chessmen</a></li> <li><a href="/wiki/Romantic_chess" title="Romantic chess">Romantic chess</a></li> <li><a href="/wiki/Hypermodernism_(chess)" title="Hypermodernism (chess)">Hypermodernism</a></li> <li><a href="/wiki/Soviet_chess_school" title="Soviet chess school">Soviet chess school</a></li> <li><a href="/wiki/Comparison_of_top_chess_players_throughout_history" title="Comparison of top chess players throughout history">Top player comparison</a></li></ul></li> <li><a href="/wiki/Geography_of_chess" title="Geography of chess">Geography of chess</a> <ul><li><a href="/wiki/Chess_in_Africa" title="Chess in Africa">Africa</a> <ul><li><a href="/wiki/Chess_in_South_Africa" title="Chess in South Africa">South Africa</a></li></ul></li> <li><a href="/wiki/Chess_in_China" title="Chess in China">China</a></li> <li><a href="/wiki/Chess_in_Europe" title="Chess in Europe">Europe</a> <ul><li><a href="/wiki/Chess_in_Armenia" title="Chess in Armenia">Armenia</a></li> <li><a href="/wiki/Chess_in_Spain" title="Chess in Spain">Spain</a></li></ul></li> <li><a href="/wiki/Chess_in_India" title="Chess in India">India</a></li></ul></li> <li><a href="/wiki/List_of_chess_games" title="List of chess games">Notable games</a></li> <li><a href="/wiki/List_of_chess_players" title="List of chess players">List of chess players</a> <ul><li><a href="/wiki/List_of_amateur_chess_players" title="List of amateur chess players">amateurs</a></li> <li><a href="/wiki/List_of_female_chess_players" title="List of female chess players">female</a></li> <li><a href="/wiki/List_of_chess_grandmasters" title="List of chess grandmasters">grandmasters</a></li></ul></li> <li><a href="/wiki/Women_in_chess" title="Women in chess">Women in chess</a></li> <li><a href="/wiki/Category:Chess_museums" title="Category:Chess museums">Chess museums</a> <ul><li><a href="/wiki/Bobby_Fischer_Center" title="Bobby Fischer Center">Bobby Fischer Center</a></li> <li><a href="/wiki/G%C3%B6kyay_Association_Chess_Museum" title="Gökyay Association Chess Museum">Gökyay Association Chess Museum</a></li> <li><a href="/wiki/World_Chess_Hall_of_Fame" title="World Chess Hall of Fame">World Chess Hall of Fame</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Rules_of_chess" title="Rules of chess">Rules</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Castling" title="Castling">Castling</a></li> <li><a href="/wiki/Cheating_in_chess" title="Cheating in chess">Cheating in chess</a></li> <li><a href="/wiki/Check_(chess)" title="Check (chess)">Check</a></li> <li><a href="/wiki/Checkmate" title="Checkmate">Checkmate</a></li> <li><a href="/wiki/Draw_(chess)" title="Draw (chess)">Draw</a> <ul><li><a href="/wiki/Draw_by_agreement" title="Draw by agreement">by agreement</a></li> <li><a href="/wiki/Fifty-move_rule" title="Fifty-move rule">Fifty-move rule</a></li> <li><a href="/wiki/Perpetual_check" title="Perpetual check">Perpetual check</a></li> <li><a href="/wiki/Stalemate" title="Stalemate">Stalemate</a></li> <li><a href="/wiki/Threefold_repetition" title="Threefold repetition">Threefold repetition</a></li></ul></li> <li><i><a href="/wiki/En_passant" title="En passant">En passant</a></i></li> <li><a href="/wiki/Promotion_(chess)" title="Promotion (chess)">Pawn promotion</a></li> <li><a href="/wiki/Time_control" title="Time control">Time control</a> <ul><li><a href="/wiki/Fast_chess" title="Fast chess">Fast chess</a></li></ul></li> <li><a href="/wiki/Touch-move_rule" title="Touch-move rule">Touch-move rule</a></li> <li><a href="/wiki/White_and_Black_in_chess" title="White and Black in chess">White and Black</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Glossary_of_chess" title="Glossary of chess">Terms</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Blunder_(chess)" title="Blunder (chess)">Blunder</a></li> <li><a href="/wiki/Chess_notation" title="Chess notation">Chess notation</a> <ul><li><a href="/wiki/Algebraic_notation_(chess)" title="Algebraic notation (chess)">algebraic</a></li> <li><a href="/wiki/Descriptive_notation" title="Descriptive notation">descriptive</a></li> <li><a href="/wiki/Portable_Game_Notation" title="Portable Game Notation">PGN</a></li> <li><a href="/wiki/Chess_annotation_symbols" title="Chess annotation symbols">annotation symbols</a></li> <li><a href="/wiki/Chess_symbols_in_Unicode" title="Chess symbols in Unicode">symbols in Unicode</a></li></ul></li> <li><a href="/wiki/Fianchetto" title="Fianchetto">Fianchetto</a></li> <li><a href="/wiki/Gambit" title="Gambit">Gambit</a></li> <li><a href="/wiki/Key_square" title="Key square">Key square</a></li> <li><a href="/wiki/King_walk" title="King walk">King walk</a></li> <li><a href="/wiki/Open_file" title="Open file">Open file</a> <ul><li><a href="/wiki/Half-open_file" title="Half-open file">Half-open file</a></li></ul></li> <li><a href="/wiki/Outpost_(chess)" title="Outpost (chess)">Outpost</a></li> <li><a href="/wiki/Pawn_(chess)" title="Pawn (chess)">Pawns</a> <ul><li><a href="/wiki/Backward_pawn" title="Backward pawn">backward</a></li> <li><a href="/wiki/Connected_pawns" title="Connected pawns">connected</a></li> <li><a href="/wiki/Doubled_pawns" title="Doubled pawns">doubled</a></li> <li><a href="/wiki/Isolated_pawn" title="Isolated pawn">isolated</a></li> <li><a href="/wiki/Passed_pawn" title="Passed pawn">passed</a></li></ul></li> <li><a href="/wiki/Swindle_(chess)" title="Swindle (chess)">Swindle</a></li> <li><a href="/wiki/Tempo_(chess)" title="Tempo (chess)">Tempo</a></li> <li><a href="/wiki/Transposition_(chess)" title="Transposition (chess)">Transposition</a></li> <li><a href="/wiki/List_of_chess_traps" title="List of chess traps">Trap</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Chess_tactic" title="Chess tactic">Tactics</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Castling#Artificial_castling" title="Castling">Artificial castling</a></li> <li><a href="/wiki/Battery_(chess)" title="Battery (chess)">Battery</a> <ul><li><a href="/wiki/Alekhine%27s_gun" title="Alekhine's gun">Alekhine's gun</a></li></ul></li> <li><a href="/wiki/Block_(chess)" title="Block (chess)">Block</a></li> <li><a href="/wiki/Checkmate_pattern" title="Checkmate pattern">Checkmate patterns</a></li> <li><a href="/wiki/Combination_(chess)" title="Combination (chess)">Combination</a></li> <li><a href="/wiki/Decoy_(chess)" title="Decoy (chess)">Decoy</a></li> <li><a href="/wiki/Deflection_(chess)" title="Deflection (chess)">Deflection</a></li> <li><a href="/wiki/Desperado_(chess)" title="Desperado (chess)">Desperado</a></li> <li><a href="/wiki/Discovered_attack" title="Discovered attack">Discovered attack</a></li> <li><a href="/wiki/Double_check" title="Double check">Double check</a></li> <li><a href="/wiki/Fork_(chess)" title="Fork (chess)">Fork</a></li> <li><a href="/wiki/Interference_(chess)" title="Interference (chess)">Interference</a></li> <li><a href="/wiki/Overloading_(chess)" title="Overloading (chess)">Overloading</a></li> <li><a href="/wiki/Pawn_storm" title="Pawn storm">Pawn storm</a></li> <li><a href="/wiki/Pin_(chess)" title="Pin (chess)">Pin</a></li> <li><a href="/wiki/Sacrifice_(chess)" title="Sacrifice (chess)">Sacrifice</a> <ul><li><a href="/wiki/Queen_sacrifice" title="Queen sacrifice">Queen sacrifice</a></li></ul></li> <li><a href="/wiki/Skewer_(chess)" title="Skewer (chess)">Skewer</a></li> <li><a href="/wiki/Undermining_(chess)" title="Undermining (chess)">Undermining</a></li> <li><a href="/wiki/Windmill_(chess)" title="Windmill (chess)">Windmill</a></li> <li><a href="/wiki/X-ray_(chess)" title="X-ray (chess)">X-ray</a></li> <li><a href="/wiki/Zwischenzug" title="Zwischenzug">Zwischenzug</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Chess_strategy" title="Chess strategy">Strategy</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Compensation_(chess)" title="Compensation (chess)">Compensation</a></li> <li><a href="/wiki/Exchange_(chess)" title="Exchange (chess)">Exchange</a> <ul><li><a href="/wiki/The_exchange_(chess)" title="The exchange (chess)">the exchange</a></li></ul></li> <li><a href="/wiki/Initiative_(chess)" title="Initiative (chess)">Initiative</a> <ul><li><a href="/wiki/First-move_advantage_in_chess" title="First-move advantage in chess">first-move advantage</a></li></ul></li> <li><a href="/wiki/Chess_middlegame" title="Chess middlegame">Middlegame</a></li> <li><a href="/wiki/Pawn_structure" title="Pawn structure">Pawn structure</a> <ul><li><a href="/wiki/Hedgehog_(chess)" title="Hedgehog (chess)">Hedgehog</a></li> <li><a href="/wiki/Isolated_pawn" title="Isolated pawn">Isolated Queen's Pawn</a></li> <li><a href="/wiki/Mar%C3%B3czy_Bind" title="Maróczy Bind">Maróczy Bind</a></li> <li><a href="/wiki/Minority_attack" title="Minority attack">Minority attack</a></li></ul></li> <li><a href="/wiki/Chess_piece_relative_value" title="Chess piece relative value">Piece values</a></li> <li><a href="/wiki/Prophylaxis_(chess)" title="Prophylaxis (chess)">Prophylaxis</a></li> <li><a href="/wiki/School_of_chess" title="School of chess">School of chess</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Chess_opening" title="Chess opening">Openings</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Flank_opening" title="Flank opening">Flank opening</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/King%27s_Fianchetto_Opening" title="King's Fianchetto Opening">Benko Opening</a></li> <li><a href="/wiki/Bird%27s_Opening" title="Bird's Opening">Bird's Opening</a></li> <li><a href="/wiki/Dunst_Opening" title="Dunst Opening">Dunst Opening</a></li> <li><a href="/wiki/English_Opening" title="English Opening">English Opening</a></li> <li><a href="/wiki/Grob%27s_Attack" title="Grob's Attack">Grob's Attack</a></li> <li><a href="/wiki/Larsen%27s_Opening" class="mw-redirect" title="Larsen's Opening">Larsen's Opening</a></li> <li><a href="/wiki/Zukertort_Opening" title="Zukertort Opening">Zukertort Opening</a> <ul><li><a href="/wiki/King%27s_Indian_Attack" title="King's Indian Attack">King's Indian Attack</a></li> <li><a href="/wiki/R%C3%A9ti_Opening" title="Réti Opening">Réti Opening</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/King%27s_Pawn_Game" title="King's Pawn Game">King's Pawn Game</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Alekhine%27s_Defence" title="Alekhine's Defence">Alekhine's Defence</a></li> <li><a href="/wiki/Caro%E2%80%93Kann_Defence" title="Caro–Kann Defence">Caro–Kann Defence</a></li> <li><a href="/wiki/French_Defence" title="French Defence">French Defence</a></li> <li><a href="/wiki/Modern_Defense" title="Modern Defense">Modern Defence</a></li> <li><a href="/wiki/Nimzowitsch_Defence" title="Nimzowitsch Defence">Nimzowitsch Defence</a></li> <li><a href="/wiki/Open_Game" title="Open Game">Open Game</a> <ul><li><a href="/wiki/Four_Knights_Game" title="Four Knights Game">Four Knights Game</a></li> <li><a href="/wiki/Giuoco_Piano" title="Giuoco Piano">Giuoco Piano</a></li> <li><a href="/wiki/Italian_Game" title="Italian Game">Italian Game</a></li> <li><a href="/wiki/King%27s_Gambit" title="King's Gambit">King's Gambit</a></li> <li><a href="/wiki/Petrov%27s_Defence" title="Petrov's Defence">Petrov's Defence</a></li> <li><a href="/wiki/Philidor_Defence" title="Philidor Defence">Philidor Defence</a></li> <li><a href="/wiki/Ponziani_Opening" title="Ponziani Opening">Ponziani Opening</a></li> <li><a href="/wiki/Ruy_Lopez" title="Ruy Lopez">Ruy Lopez</a></li> <li><a href="/wiki/Semi-Italian_Opening" title="Semi-Italian Opening">Semi-Italian Opening</a></li> <li><a href="/wiki/Scotch_Game" title="Scotch Game">Scotch Game</a></li> <li><a href="/wiki/Two_Knights_Defense" title="Two Knights Defense">Two Knights Defense</a></li> <li><a href="/wiki/Vienna_Game" title="Vienna Game">Vienna Game</a></li></ul></li> <li><a href="/wiki/Owen%27s_Defence" title="Owen's Defence">Owen's Defence</a></li> <li><a href="/wiki/Pirc_Defence" title="Pirc Defence">Pirc Defence</a> <ul><li><a href="/wiki/Pirc_Defence,_Austrian_Attack" title="Pirc Defence, Austrian Attack">Austrian Attack</a></li></ul></li> <li><a href="/wiki/Scandinavian_Defense" title="Scandinavian Defense">Scandinavian Defense</a></li> <li><a href="/wiki/Sicilian_Defence" title="Sicilian Defence">Sicilian Defence</a> <ul><li><a href="/wiki/Sicilian_Defence,_Alapin_Variation" title="Sicilian Defence, Alapin Variation">Alapin</a></li> <li><a href="/wiki/Sicilian_Defence,_Dragon_Variation" title="Sicilian Defence, Dragon Variation">Dragon</a>/<a href="/wiki/Sicilian_Defence,_Accelerated_Dragon" title="Sicilian Defence, Accelerated Dragon">Accelerated Dragon</a></li> <li><a href="/wiki/Sicilian_Defence,_Najdorf_Variation" title="Sicilian Defence, Najdorf Variation">Najdorf</a></li> <li><a href="/wiki/Sicilian_Defence,_Scheveningen_Variation" title="Sicilian Defence, Scheveningen Variation">Scheveningen</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Queen%27s_Pawn_Game" title="Queen's Pawn Game">Queen's Pawn Game</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Budapest_Gambit" title="Budapest Gambit">Budapest Gambit</a></li> <li><a href="/wiki/Colle_System" title="Colle System">Colle System</a></li> <li><a href="/wiki/Dutch_Defence" title="Dutch Defence">Dutch Defence</a></li> <li><a href="/wiki/English_Defence" title="English Defence">English Defence</a></li> <li><a href="/wiki/Indian_Defence" title="Indian Defence">Indian Defence</a> <ul><li><a href="/wiki/Benoni_Defense" title="Benoni Defense">Benoni Defence</a></li> <li><a href="/wiki/Modern_Benoni" title="Modern Benoni">Modern Benoni</a></li> <li><a href="/wiki/Bogo-Indian_Defence" title="Bogo-Indian Defence">Bogo-Indian Defence</a></li> <li><a href="/wiki/Catalan_Opening" title="Catalan Opening">Catalan Opening</a></li> <li><a href="/wiki/Gr%C3%BCnfeld_Defence" title="Grünfeld Defence">Grünfeld Defence</a></li> <li><a href="/wiki/King%27s_Indian_Defence" title="King's Indian Defence">King's Indian Defence</a></li> <li><a href="/wiki/Nimzo-Indian_Defence" title="Nimzo-Indian Defence">Nimzo-Indian Defence</a></li> <li><a href="/wiki/Old_Indian_Defense" title="Old Indian Defense">Old Indian Defense</a></li> <li><a href="/wiki/Queen%27s_Indian_Defense" title="Queen's Indian Defense">Queen's Indian Defence</a></li></ul></li> <li><a href="/wiki/London_System" title="London System">London System</a></li> <li><a href="/wiki/Richter%E2%80%93Veresov_Attack" title="Richter–Veresov Attack">Richter–Veresov Attack</a></li> <li><a href="/wiki/Queen%27s_Gambit" title="Queen's Gambit">Queen's Gambit</a> <ul><li><a href="/wiki/Queen%27s_Gambit_Accepted" title="Queen's Gambit Accepted">Accepted</a></li> <li><a href="/wiki/Queen%27s_Gambit_Declined" title="Queen's Gambit Declined">Declined</a></li> <li><a href="/wiki/Slav_Defense" title="Slav Defense">Slav Defence</a></li> <li><a href="/wiki/Semi-Slav_Defense" title="Semi-Slav Defense">Semi-Slav Defence</a></li> <li><a href="/wiki/Chigorin_Defense" title="Chigorin Defense">Chigorin Defense</a></li></ul></li> <li><a href="/wiki/Torre_Attack" title="Torre Attack">Torre Attack</a></li> <li><a href="/wiki/Trompowsky_Attack" title="Trompowsky Attack">Trompowsky Attack</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_chess_openings" title="List of chess openings">List of openings</a> <ul><li><a href="/wiki/Chess_opening_theory_table" title="Chess opening theory table">theory table</a></li></ul></li> <li><a href="/wiki/List_of_chess_gambits" title="List of chess gambits">List of chess gambits</a></li> <li><a href="/wiki/Irregular_chess_opening" title="Irregular chess opening">Irregular</a> <ul><li><a href="/wiki/Bongcloud_Attack" title="Bongcloud Attack">Bongcloud Attack</a></li> <li><a href="/wiki/Fool%27s_mate" title="Fool's mate">Fool's mate</a></li> <li><a href="/wiki/Scholar%27s_mate" title="Scholar's mate">Scholar's mate</a></li></ul></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Chess_endgame" title="Chess endgame">Endgames</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bishop_and_knight_checkmate" title="Bishop and knight checkmate">Bishop and knight checkmate</a></li> <li><a href="/wiki/King_and_pawn_versus_king_endgame" title="King and pawn versus king endgame">King and pawn vs king</a></li> <li><a href="/wiki/Opposite-colored_bishops_endgame" title="Opposite-colored bishops endgame">Opposite-coloured bishops</a></li> <li><a href="/wiki/Pawnless_chess_endgame" title="Pawnless chess endgame">Pawnless endgame</a></li> <li><a href="/wiki/Queen_and_pawn_versus_queen_endgame" title="Queen and pawn versus queen endgame">Queen and pawn vs queen</a></li> <li><a href="/wiki/Queen_versus_pawn_endgame" title="Queen versus pawn endgame">Queen vs pawn</a></li> <li><a href="/wiki/Queen_versus_rook_endgame" title="Queen versus rook endgame">Queen vs rook</a></li> <li><a href="/wiki/Rook_and_bishop_versus_rook_endgame" title="Rook and bishop versus rook endgame">Rook and bishop vs rook</a></li> <li><a href="/wiki/Rook_and_pawn_versus_rook_endgame" title="Rook and pawn versus rook endgame">Rook and pawn vs rook</a> <ul><li><a href="/wiki/Lucena_position" title="Lucena position">Lucena position</a></li> <li><a href="/wiki/Philidor_position" title="Philidor position">Philidor position</a></li></ul></li> <li>Strategy <ul><li><a class="mw-selflink selflink">fortress</a></li> <li><a href="/wiki/Opposition_(chess)" title="Opposition (chess)">opposition</a></li> <li><a href="/wiki/Tarrasch_rule" title="Tarrasch rule">Tarrasch rule</a></li> <li><a href="/wiki/Triangulation_(chess)" title="Triangulation (chess)">triangulation</a></li> <li><a href="/wiki/Zugzwang" title="Zugzwang">Zugzwang</a></li></ul></li> <li><a href="/wiki/Endgame_study" title="Endgame study">Study</a></li> <li><a href="/wiki/Endgame_tablebase" title="Endgame tablebase">Tablebase</a></li> <li><a href="/wiki/Two_knights_endgame" title="Two knights endgame">Two knights endgame</a></li> <li><a href="/wiki/Wrong_bishop" title="Wrong bishop">Wrong bishop</a></li> <li><a href="/wiki/Wrong_rook_pawn" title="Wrong rook pawn">Wrong rook pawn</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Chess_tournament" title="Chess tournament">Tournaments</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_strong_chess_tournaments" title="List of strong chess tournaments">List of strong chess tournaments</a></li> <li><a href="/wiki/Chess_Olympiad" title="Chess Olympiad">Chess Olympiad</a> <ul><li><a href="/wiki/Women%27s_Chess_Olympiad" title="Women's Chess Olympiad">Women</a></li></ul></li> <li><a href="/wiki/World_Chess_Championship" title="World Chess Championship">World Chess Championship</a> <ul><li><a href="/wiki/List_of_World_Chess_Championships" title="List of World Chess Championships">List</a></li> <li><a href="/wiki/Candidates_Tournament" title="Candidates Tournament">Candidates Tournament</a></li> <li><a href="/wiki/Chess_World_Cup" title="Chess World Cup">Chess World Cup</a></li> <li><a href="/wiki/FIDE_Grand_Prix" title="FIDE Grand Prix">FIDE Grand Prix</a></li></ul></li> <li>Other world championships <ul><li><a href="/wiki/Women%27s_World_Chess_Championship" title="Women's World Chess Championship">Women</a></li> <li><a href="/wiki/World_Team_Chess_Championship" title="World Team Chess Championship">Team</a></li> <li><a href="/wiki/World_Rapid_Chess_Championship" title="World Rapid Chess Championship">Rapid</a></li> <li><a href="/wiki/World_Blitz_Chess_Championship" title="World Blitz Chess Championship">Blitz</a></li> <li><a href="/wiki/World_Junior_Chess_Championship" title="World Junior Chess Championship">Junior</a></li> <li><a href="/wiki/World_Youth_Chess_Championship" title="World Youth Chess Championship">Youth</a></li> <li><a href="/wiki/World_Senior_Chess_Championship" title="World Senior Chess Championship">Senior</a></li> <li><a href="/wiki/World_Amateur_Chess_Championship" title="World Amateur Chess Championship">Amateur</a></li> <li><a href="/wiki/World_Championship_of_Chess_Composition" title="World Championship of Chess Composition">Chess composition</a></li> <li><a href="/wiki/World_Chess_Solving_Championship" title="World Chess Solving Championship">Solving</a></li></ul></li> <li>Computer chess championships <ul><li><a href="/wiki/Chess.com_Computer_Chess_Championship" class="mw-redirect" title="Chess.com Computer Chess Championship">CCC</a></li> <li><a href="/wiki/Dutch_Open_Computer_Chess_Championship" title="Dutch Open Computer Chess Championship">CSVN</a></li> <li><a href="/wiki/North_American_Computer_Chess_Championship" title="North American Computer Chess Championship">North American</a></li> <li><a href="/wiki/Top_Chess_Engine_Championship" title="Top Chess Engine Championship">TCEC</a></li> <li><a href="/wiki/World_Computer_Chess_Championship" title="World Computer Chess Championship">WCCC</a></li> <li><a href="/wiki/World_Computer_Speed_Chess_Championship" title="World Computer Speed Chess Championship">WCSCC</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Art and media</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ca%C3%AFssa" title="Caïssa">Caïssa</a></li> <li><a href="/wiki/Chess_aesthetics" title="Chess aesthetics">Chess aesthetics</a></li> <li><a href="/wiki/Chess_in_the_arts" title="Chess in the arts">Chess in the arts</a> <ul><li><a href="/wiki/Chess_in_early_literature" title="Chess in early literature">early literature</a></li> <li><a href="/wiki/Category:Films_about_chess" title="Category:Films about chess">film</a></li> <li><a href="/wiki/Category:Novels_about_chess" title="Category:Novels about chess">novels</a></li> <li><a href="/wiki/Category:Chess_paintings" title="Category:Chess paintings">paintings</a></li> <li><a href="/wiki/Category:Poems_about_chess" title="Category:Poems about chess">poetry</a></li> <li><a href="/wiki/Category:Short_stories_about_chess" title="Category:Short stories about chess">short stories</a></li></ul></li> <li><a href="/wiki/List_of_chess_books" title="List of chess books">Chess books</a> <ul><li><a href="/wiki/Chess_opening_book" title="Chess opening book">opening books</a></li> <li><a href="/wiki/Chess_endgame_literature" title="Chess endgame literature">endgame literature</a></li> <li><a href="/wiki/The_Oxford_Companion_to_Chess" title="The Oxford Companion to Chess"><i>Oxford Companion</i></a></li></ul></li> <li><a href="/wiki/Chess_libraries" title="Chess libraries">Chess libraries</a></li> <li><a href="/wiki/Chess_columns_in_newspapers" title="Chess columns in newspapers">Chess newspaper columns</a></li> <li><a href="/wiki/List_of_chess_periodicals" title="List of chess periodicals">Chess periodicals</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Arbiter_(chess)" title="Arbiter (chess)">Arbiter</a></li> <li><a href="/wiki/Chess_boxing" title="Chess boxing">Chess boxing</a></li> <li><a href="/wiki/Chess_club" title="Chess club">Chess club</a></li> <li><a href="/wiki/Chess_composer" title="Chess composer">Chess composer</a></li> <li><a href="/wiki/Chess_engine" title="Chess engine">Chess engine</a> <ul><li><a href="/wiki/AlphaZero" title="AlphaZero">AlphaZero</a></li> <li><a href="/wiki/Deep_Blue_(chess_computer)" title="Deep Blue (chess computer)">Deep Blue</a></li> <li><a href="/wiki/Leela_Chess_Zero" title="Leela Chess Zero">Leela Chess Zero</a></li> <li><a href="/wiki/Stockfish_(chess)" title="Stockfish (chess)">Stockfish</a></li></ul></li> <li><a href="/wiki/Chess_problem" title="Chess problem">Chess problem</a> <ul><li><a href="/wiki/Glossary_of_chess_problems" title="Glossary of chess problems">glossary</a></li> <li><a href="/wiki/Joke_chess_problem" title="Joke chess problem">joke chess</a></li></ul></li> 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