--- /dev/null
+<!doctype html>
+<html>
+<head>
+ <title>Checkered Rules</title>
+ <link href="/common.css" rel="stylesheet"/>
+ <link href="/variants/Checkered/style.css" rel="stylesheet"/>
+</head>
+<body>
+
+<div class="full-rules">
+<h1>Checkered Rules</h1>
+
+<div>
+<p class="boxed">
+ The capture of an enemy piece produces a new "checkered" piece belonging
+ to both players.
+</p>
+<figure class="showPieces text-center">
+ <img src="pieces/cp.svg"/>
+ <img src="pieces/cr.svg"/>
+ <img src="pieces/cn.svg"/>
+ <img src="pieces/cb.svg"/>
+ <img src="pieces/cq.svg"/>
+ <figcaption>Checkered pieces, born after captures.</figcaption>
+</figure>
+<p>Note: the initial French name for this variant is "l'Échiqueté".</p>
+<p>The game potentially evolves in two stages.</p>
+</div>
+
+<div>
+<h2 class="stageDelimiter">Stage 1</h2>
+<h3>Basics</h3>
+<ol>
+ <li>
+ Each capture produces a new piece, taking on nature of
+ the capturing or captured one.
+ </li>
+ <li>
+ The new piece arising from a capture has a new color:
+ "checkered", as illustrated above.
+ </li>
+ <li>
+ All checkered pieces belong to the player in turn and can
+ capture the opponents pieces.
+ </li>
+</ol>
+<p>Remarks:</p>
+<ul>
+ <li>
+ A non-capturing checkered move cannot be "undone" right after since
+ this would repeat the same position.
+ </li>
+ <li>Checkered pieces cannot be captured.</li>
+</ul>
+<figure class="diagram-container">
+ <div class="diagram">fen:2kr4/pp6/2p5/4ss1r/1P2ns1P/2Np4/P1P1P1BP/R2o1RK1:</div>
+ <figcaption>
+ Black plays Rxh4=P. (Checkered pawn to) h5 is allowed then,
+ because piece's nature changed.
+
+ </figcaption>
+</figure>
+<h3>Pawns</h3>
+<ul>
+ <li>
+ Pawns can jump two squares only from their initial rank, and only once in
+ the game. A checkered pawn keeps this right if the starting pawn
+ did not use it.
+ </li>
+ <li>
+ Checkered pawns cannot capture en passant, because while the pawn was
+ "passing" they were of the same color.
+
+ </li>
+</ul>
+<h3>Stalemate or checkmate?</h3>
+<p>
+ The following diagram seems to show a mating pattern, but the king if
+ "attacked" by a checkered pawn – which still belongs to white.
+ Therefore, it can be considered that it's not really a check because
+ white is unable to "give back the turn".
+ Without the black bishop on a7 it would be mate (without debate), because
+ the king could virtually go to g1 before being captured by the
+ chameleon pawn.
+
+</p>
+<figure>
+ <div class="diag"
+ data-fen='7k/b5pp/8/8/8/8/6ss/7K w 4 {"flags":"88880000000000000011"}'>
+ </div>
+ <figcaption>After 1...g2+(#?).</figcaption>
+</figure>
+<p>
+ The interface considers that it's mate in both cases, following the idea
+ "it's checkmate if we cannot move, and the opponent on its turn could
+ take the king" (maybe after an impossible move).
+
+</p>
+</div>
+
+<div>
+<h2 class="stageDelimiter">Stage 2</h2>
+<p class="italic">
+ This stage can be disabled by unselecting "With switch" at game creation.
+</p>
+<p>
+ During the game one of the two players can decide to take control of the
+ checkered pieces.
+ They thus become autonomous and vulnerable to being captured - stage 2
+ begins. The other player is in charge of both the white and black pieces, and
+ tries to eliminate checkered pieces.
+ The checkered side wins by checkmating either the white or black king.
+</p>
+<p>
+ To take the checkered pieces, play a move that "takes opponent's king" with
+ your king, and then execute a move. This is possible only if no such move
+ can capture a king.
+</p>
+<h4>Variant of stage 2 (unimplemented)</h4>
+<p>
+ An observer could decide to join the game by taking the checkered pieces
+ at any moment.
+ It then becomes a chess game with three players, with some subtelties to be
+ resolved. It was tested in some (real life) games.
+</p>
+<h3>Special moves</h3>
+<p>Checkered pawns can...</p>
+<ul>
+ <li>move and capture in either direction;</li>
+ <li>take en passant,</li>
+ <li>be promoted on either the first or eighth row.</li>
+</ul>
+</div>
+
+<div>
+<h3>Credits</h3>
+<ul>
+ <li>
+ The rules of Checkered Chess were thought up by Patrick Bernier and
+ developed with the help of Benjamin Auder around 2011-2012.
+ </li>
+ <li>
+ Thanks also to Olive Martin, Christian Poisson, Bevis Martin, Laurent
+ Nouhaud and Frédéric Fradet.
+ </li>
+</ul>
+</div>
+
+</body>
+<script src="/utils/drawDiagrams.js"></script>
+<script>fenToDiag("Checkered");</script>
+</html>
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