variants/Checkered/complete_rules.html

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   4   <title>Checkered Rules</title>
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   9
  10 <div class="full-rules">
  11 <h1>Checkered Rules</h1>
  12
  13 <div>
  14 <p class="boxed">
  15   The capture of an enemy piece produces a new "checkered" piece belonging
  16   to both players.
  17 </p>
  18 <figure class="showPieces text-center">
  19   <img src="pieces/cp.svg"/>
  20   <img src="pieces/cr.svg"/>
  21   <img src="pieces/cn.svg"/>
  22   <img src="pieces/cb.svg"/>
  23   <img src="pieces/cq.svg"/>
  24   <figcaption>Checkered pieces, born after captures.</figcaption>
  25 </figure>
  26 <p>Note: the initial French name for this variant is "l'Échiqueté".</p>
  27 <p>The game potentially evolves in two stages.</p>
  28 </div>
  29
  30 <div>
  31 <h2 class="stageDelimiter">Stage 1</h2>
  32 <h3>Basics</h3>
  33 <ol>
  34   <li>
  35     Each capture produces a new piece, taking on nature of
  36     the capturing or captured one.
  37   </li>
  38   <li>
  39     The new piece arising from a capture has a new color:
  40     "checkered", as illustrated above.
  41   </li>
  42   <li>
  43     All checkered pieces belong to the player in turn and can
  44     capture the opponents pieces.
  45   </li>
  46 </ol>
  47 <p>Remarks:</p>
  48 <ul>
  49   <li>
  50     A non-capturing checkered move cannot be "undone" right after since
  51     this would repeat the same position.
  52   </li>
  53   <li>Checkered pieces cannot be captured.</li>
  54 </ul>
  55 <figure class="diagram-container">
  56   <div class="diagram">fen:2kr4/pp6/2p5/4ss1r/1P2ns1P/2Np4/P1P1P1BP/R2o1RK1:</div>
  57   <figcaption>
  58     Black plays Rxh4=P. (Checkered pawn to) h5 is allowed then,
  59     because piece's nature changed.
  60
  61   </figcaption>
  62 </figure>
  63 <h3>Pawns</h3>
  64 <ul>
  65   <li>
  66     Pawns can jump two squares only from their initial rank, and only once in
  67     the game. A checkered pawn keeps this right if the starting pawn
  68     did not use it.
  69   </li>
  70   <li>
  71     Checkered pawns cannot capture en passant, because while the pawn was
  72     "passing" they were of the same color.
  73
  74   </li>
  75 </ul>
  76 <h3>Stalemate or checkmate?</h3>
  77 <p>
  78   The following diagram seems to show a mating pattern, but the king if
  79   "attacked" by a checkered pawn &ndash; which still belongs to white.
  80   Therefore, it can be considered that it's not really a check because
  81   white is unable to "give back the turn".
  82   Without the black bishop on a7 it would be mate (without debate), because
  83   the king could virtually go to g1 before being captured by the
  84   chameleon pawn.
  85
  86 </p>
  87 <figure>
  88   <div class="diag"
  89        data-fen='7k/b5pp/8/8/8/8/6ss/7K w 4 {"flags":"88880000000000000011"}'>
  90   </div>
  91   <figcaption>After 1...g2+(#?).</figcaption>
  92 </figure>
  93 <p>
  94   The interface considers that it's mate in both cases, following the idea
  95   "it's checkmate if we cannot move, and the opponent on its turn could
  96   take the king" (maybe after an impossible move).
  97
  98 </p>
  99 </div>
 100
 101 <div>
 102 <h2 class="stageDelimiter">Stage 2</h2>
 103 <p class="italic">
 104   This stage can be disabled by unselecting "With switch" at game creation.
 105 </p>
 106 <p>
 107   During the game one of the two players can decide to take control of the
 108   checkered pieces.
 109   They thus become autonomous and vulnerable to being captured - stage 2
 110   begins. The other player is in charge of both the white and black pieces, and
 111   tries to eliminate checkered pieces.
 112   The checkered side wins by checkmating either the white or black king.
 113 </p>
 114 <p>
 115   To take the checkered pieces, play a move that "takes opponent's king" with
 116   your king, and then execute a move. This is possible only if no such move
 117   can capture a king.
 118 </p>
 119 <h4>Variant of stage 2 (unimplemented)</h4>
 120 <p>
 121   An observer could decide to join the game by taking the checkered pieces
 122   at any moment.
 123   It then becomes a chess game with three players, with some subtelties to be
 124   resolved. It was tested in some (real life) games.
 125 </p>
 126 <h3>Special moves</h3>
 127 <p>Checkered pawns can...</p>
 128 <ul>
 129   <li>move and capture in either direction;</li>
 130   <li>take en passant,</li>
 131   <li>be promoted on either the first or eighth row.</li>
 132 </ul>
 133 </div>
 134
 135 <div>
 136 <h3>Credits</h3>
 137 <ul>
 138   <li>
 139     The rules of Checkered Chess were thought up by Patrick Bernier and
 140     developed with the help of Benjamin Auder around 2011-2012.
 141   </li>
 142   <li>
 143     Thanks also to Olive Martin, Christian Poisson, Bevis Martin, Laurent
 144     Nouhaud and Frédéric Fradet.
 145   </li>
 146 </ul>
 147 </div>
 148
 149 </body>
 150 <script src="/utils/drawDiagrams.js"></script>
 151 <script>fenToDiag("Checkered");</script>
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