variants/Checkered/complete_rules.html

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