--- /dev/null
+p.boxed
+ | The capture of an enemy piece produces a new "checkered" piece belonging
+ | to both players.
+
+figure.showPieces.center-align
+ img(src="/images/tmp_checkered/cp.png")
+ img(src="/images/tmp_checkered/cr.png")
+ img(src="/images/tmp_checkered/cn.png")
+ img(src="/images/tmp_checkered/cb.png")
+ img(src="/images/tmp_checkered/cq.png")
+ img(src="/images/tmp_checkered/no_ck.png")
+ figcaption Checkered pieces, born after captures.
+
+h3 Specifications
+
+ul
+ li Chessboard: standard.
+ li Material: additional checkered pieces.
+ li Non-capturing moves: standard; see below.
+ li Special moves: standard; see below.
+ li Captures: standard; see below.
+ li End of game: standard.
+
+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.
+
+span Remarks:
+ul
+ li A checkered move cannot be "undone" right after if this repeat the 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 Pawn moves
+
+ul
+ li.
+ Pawns can jump two squares only from their initial rank, and only once in the game:
+ a checkered pawn returning on the pawns' start rank cannot jump. However:
+ li.
+ A pawn captured on its starting square (thus becoming "checkered") keeps the
+ right to advance two squares.
+ li.
+ Checkered pawns cannot capture en passant, because while the pawn was "passing"
+ they were of the same color.
+
+h2.stageDelimiter Stage 2
+
+p.warn This stage is not (and probably will never be) implemented.
+
+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.
+
+h4 Variant of stage 2
+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 creator.
+
+h3 Special moves
+
+span 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.
+ li.
+ Thanks also to Olive Martin, Christian Poisson, Bevis Martin, Laurent Nouhaud
+ and Frédéric Fradet.