Triangular chess (game)

<h2 id="game-rules">Game rules</h2>
<p>The starting setup is as shown. As in <a href="/facts/Chess/47ykvkHF">chess</a>, <a href="/facts/White_and_Black_in_chess/2WfYjFcf">White</a> moves first, and the object is <a href="/facts/Checkmate/0TrSapPq">checkmate</a>. Other standard conventions apply as well, including <a href="/facts/Castling/S20sKRjc">castling</a>, the pawn's initial two-step move, the <i><a href="/facts/En_passant/XC2lRjxP">en passant</a></i> capture, and <a href="/facts/Promotion_(chess)/V1rtTYu2">promotion</a> at the last <a href="/facts/Glossary_of_chess/bh0g4wCP">rank</a>. The triangular geometry, however, implies special move patterns for the pieces.
</p>
<h3>Piece moves</h3>
<ul><li>A rook moves in a straight line starting through a cell <i>edge</i>. (Three directions are possible.)</li>
<li>A bishop moves in a straight line starting through a cell <i><a href="/facts/Vertex_(geometry)/ID3cea9z">vertex</a></i>. (Three directions.)</li>
<li>The queen moves as a rook or bishop. (Six directions.)</li>
<li>The king moves one step as a queen. When castling, the king slides two cells if <a href="/facts/Glossary_of_chess/bh0g4wCP">castling short</a> (0-0); three cells if <a href="/facts/Glossary_of_chess/bh0g4wCP">castling long</a> (0-0-0).</li>
<li>A knight moves in the pattern: two steps as a bishop, then one step as a rook in an <a href="/facts/Orthogonality/JVIjYPog">orthogonal</a> direction. A knight leaps any intervening men.</li>
<li>The unicorn moves in the pattern: two steps as a rook, then one step as a rook in an orthogonal direction. Like a knight, the unicorn <a href="/facts/Fairy_chess_piece/eCFMrkJa">leaps</a> any intervening men.</li>
<li>A pawn moves straight forward one step at a time, whether crossing a cell edge or vertex. On its first move it may optionally move two steps straight forward. A pawn captures to either cell adjoining the cell immediately in front, in the same rank.</li>
<li>If a pawn reaches a board edge where no step straight forward exists, the pawn continues to advance toward promotion using its capture move (whether there are men to capture or not).</li></ul>

<h2 id="tri-chess">Tri-chess</h2>
<p class="note">For the three-player variant by Dekle, see <a href="/facts/Tri-chess/vQsWQ2Ku">Tri-chess</a>.</p>
<p class="note">For three-player chess variants in general, see <a href="/facts/Three-player_chess/WRdwrLqz">Three-player chess</a>.</p>
<p>Tri-chess is a variation of triangular chess created by Dekle in the same year.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a><a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> The game is for two players and is the same as triangular chess in all respects except the moves of the bishop, rook, queen, and king are increased.
</p>
<ul><li>A bishop moves in six directions constituting board <i>diagonals</i>.</li>
<li>A rook moves in six directions along horizontal <i>ranks</i> or oblique <i>files</i>.</li>
<li>The queen moves as a rook or bishop. (Twelve directions.)</li>
<li>The king moves one step as a bishop or two steps as a rook.</li></ul>

<h2 id="see-also">See also</h2>
<ul><li>Also by George Dekle:
<ul><li><a href="/facts/Masonic_chess/XPw6wACH">Masonic chess</a></li>
<li><a href="/facts/Tri-chess/vQsWQ2Ku">Tri-chess</a> – a three-player variant with triangular cells</li>
<li><a href="/facts/Trishogi/83CxautC">Trishogi</a> – a <a href="/facts/Shogi_variant/76Ap2tFW">shogi variant</a> with triangular cells</li></ul></li></ul>
<h2 id="notes">Notes</h2>

<p>Bibliography
</p>
<ul><li>Keller, Michael, ed. (June 1991). "A Panorama of Chess Variants". <i>World Game Review</i>. No. 10. Michael Keller. <a href="/facts/ISSN_(identifier)/DPAflDvU">ISSN</a> <a href="https://search.worldcat.org/issn/1041-0546">1041-0546</a>.</li>
<li><a href="/facts/David_Pritchard_(chess_player)/bec3s2aV">Pritchard, D. B.</a> (1994). <i>The Encyclopedia of Chess Variants</i>. Games & Puzzles Publications. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 0-9524142-0-1.</li>
<li><a href="/facts/David_Pritchard_(chess_player)/bec3s2aV">Pritchard, D. B.</a> (2007). Beasley, John (ed.). <i>The Classified Encyclopedia of Chess Variants</i>. John Beasley. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-0-9555168-0-1.</li></ul>
<h2 id="external-links">External links</h2>
<ul><li><a href="http://www.pathguy.com/chess/Triangul.htm">Triangular Chess</a> <a href="http://www.pathguy.com/chess/Triangl2.htm">Tri-Chess</a> simple programs by Ed Friedlander (<a href="/facts/Java_(programming_language)/9ScgFyAL">Java</a>)</li>
<li><a href="https://www.omnichess.club/variant/tri_chess">Triangular Chess</a> See detailed rule descriptions, piece movements and play this variant on Omnichess</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Pritchard (1994), pp. 321–22 - Pritchard, D. B. (1994). The Encyclopedia of Chess Variants. Games & Puzzles Publications. ISBN 0-9524142-0-1. <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>Pritchard (2007), p. 213 - Pritchard, D. B. (2007). Beasley, John (ed.). The Classified Encyclopedia of Chess Variants. John Beasley. ISBN 978-0-9555168-0-1. <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>Keller (1991) - Keller, Michael, ed. (June 1991). "A Panorama of Chess Variants". World Game Review. No. 10. Michael Keller. ISSN 1041-0546. <a href="https://search.worldcat.org/issn/1041-0546" target="_blank">https://search.worldcat.org/issn/1041-0546</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
<li id="fn:4"><p>Pritchard (1994), p. 323 - Pritchard, D. B. (1994). The Encyclopedia of Chess Variants. Games & Puzzles Publications. ISBN 0-9524142-0-1. <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li>
<li id="fn:5"><p>Pritchard (2007), p. 213 - Pritchard, D. B. (2007). Beasley, John (ed.). The Classified Encyclopedia of Chess Variants. John Beasley. ISBN 978-0-9555168-0-1. <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li>
</ol>

Triangular chess (game) open-in-new

Triangular chess (game)