+++ /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.
-
-p Note: the initial French name for this variant is "l'Échiqueté".
-
-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.
-
-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 Pions
-
-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.
-
-p.bold.bigfont If you wanna play, you can stop reading here.
-
-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 pawn-chamaleon.
-
-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.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
-
-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.
- li.
- Thanks also to Olive Martin, Christian Poisson, Bevis Martin, Laurent Nouhaud
- and Frédéric Fradet.
projects / vchess.git / blobdiff