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+p.boxed
+  | The capture of an enemy piece produces a new "checkered" piece belonging
+  | to both players.
+
+figure.showPieces.text-center
+  img(src="/images/pieces/Checkered/cp.svg")
+  img(src="/images/pieces/Checkered/cr.svg")
+  img(src="/images/pieces/Checkered/cn.svg")
+  img(src="/images/pieces/Checkered/cb.svg")
+  img(src="/images/pieces/Checkered/cq.svg")
+  figcaption Checkered pieces, born after captures.
+
+p Note: the initial French name for this variant is "l'Échiqueté".
+
+p The game potentially evolves in two stages.
+
+h2.stageDelimiter Stage 1
+
+h3 Basics
+
+ol
+  li
+    | Each capture produces a new piece, taking on nature of
+    | the capturing or captured one.
+  li
+    | The new piece arising from a capture has a new color:
+    | "checkered", as illustrated above.
+  li
+    | All checkered pieces belong to the player in turn and can
+    | capture the opponents pieces.
+
+p Remarks:
+ul
+  li.
+    A non-capturing checkered move cannot be "undone" right after since
+    this would repeat the same position.
+  li Checkered pieces cannot be captured.
+
+figure.diagram-container
+  .diagram
+    | fen:2kr4/pp6/2p5/4ss1r/1P2ns1P/2Np4/P1P1P1BP/R2o1RK1:
+  figcaption.
+    Black plays Rxh4=P. (Checkered pawn to) h5 is allowed then,
+    because piece's nature changed.
+
+h3 Pawns
+
+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.
+    Checkered pawns cannot capture en passant, because while the pawn was
+    "passing" they were of the same color.
+
+h3 Stalemate or checkmate?
+
+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.
+
+figure.diagram-container
+  .diagram
+    | fen:7k/b5pp/8/8/8/8/6ss/7K:
+  figcaption After 1...g2+(#?)
+
+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).
+
+h2.stageDelimiter Stage 2
+
+p.italic.
+  This stage can be disabled by unselecting "With switch" at game creation.
+
+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.
+  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.
+
+h4 Variant of stage 2 (unimplemented)
+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 organised by the variant
+  inventor.
+
+h3 Special moves
+
+p Checkered pawns can...
+ul
+  li move and capture in either direction;
+  li take en passant,
+  li be promoted on either the first or eighth row.
+
+h3 Credits
+
+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.
+    Thanks also to Olive Martin, Christian Poisson, Bevis Martin, Laurent
+    Nouhaud and Frédéric Fradet.