+++ /dev/null
-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.
- 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.
projects / vchess.git / blobdiff