[vchess.git] / client / src / rules / Checkered / en.pug

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 &ndash; 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.
Commit	Line	Data
	1	p.boxed
	2	\| The capture of an enemy piece produces a new "checkered" piece belonging
	3	\| to both players.
	4
	5	figure.showPieces.center-align
	6	img(src="/images/tmp_checkered/cp.png")
	7	img(src="/images/tmp_checkered/cr.png")
	8	img(src="/images/tmp_checkered/cn.png")
	9	img(src="/images/tmp_checkered/cb.png")
	10	img(src="/images/tmp_checkered/cq.png")
	11	img(src="/images/tmp_checkered/no_ck.png")
	12	figcaption Checkered pieces, born after captures.
	13
	14	p Note: the initial French name for this variant is "l'Échiqueté".
	15
	16	h3 Specifications
	17
	18	ul
	19	li Chessboard: standard.
	20	li Material: additional checkered pieces.
	21	li Non-capturing moves: standard; see below.
	22	li Special moves: standard; see below.
	23	li Captures: standard; see below.
	24	li End of game: standard.
	25
	26	p The game potentially evolves in two stages.
	27
	28	h2.stageDelimiter Stage 1
	29
	30	h3 Basics
	31
	32	ol
	33	li
	34	\| Each capture produces a new piece, taking on nature of
	35	\| the capturing or captured one.
	36	li
	37	\| The new piece arising from a capture has a new color:
	38	\| "checkered", as illustrated above.
	39	li
	40	\| All checkered pieces belong to the player in turn and can
	41	\| capture the opponents pieces.
	42
	43	p Remarks:
	44	ul
	45	li.
	46	A non-capturing checkered move cannot be "undone" right after since
	47	this would repeat the same position.
	48	li Checkered pieces cannot be captured.
	49
	50	figure.diagram-container
	51	.diagram
	52	\| fen:2kr4/pp6/2p5/4ss1r/1P2ns1P/2Np4/P1P1P1BP/R2o1RK1:
	53	figcaption.
	54	Black plays Rxh4=P. (Checkered pawn to) h5 is allowed then,
	55	because piece's nature changed.
	56
	57	h3 Pions
	58
	59	ul
	60	li.
	61	Pawns can jump two squares only from their initial rank, and only once in the game:
	62	a checkered pawn returning on the pawns' start rank cannot jump. However:
	63	li.
	64	A pawn captured on its starting square (thus becoming "checkered") keeps the
	65	right to advance two squares.
	66	li.
	67	Checkered pawns cannot capture en passant, because while the pawn was "passing"
	68	they were of the same color.
	69
	70	p.bold.bigfont If you wanna play, you can stop reading here.
	71
	72	h3 Stalemate or checkmate?
	73
	74	p.
	75	The following diagram seems to show a mating pattern, but the king if
	76	"attacked" by a checkered pawn – which still belongs to white.
	77	Therefore, it can be considered that it's not really a check because
	78	white is unable to "give back the turn".
	79	Without the black bishop on a7 it would be mate (without debate), because
	80	the king could virtually go to g1 before being captured by the pawn-chamaleon.
	81
	82	figure.diagram-container
	83	.diagram
	84	\| fen:7k/b5pp/8/8/8/8/6ss/7K:
	85	figcaption After 1...g2+(#?)
	86
	87	p.
	88	The interface considers that it's mate in both cases, following the idea
	89	"it's checkmate if we cannot move, and the opponent on its turn could
	90	take the king" (maybe after an impossible move).
	91
	92	h2.stageDelimiter Stage 2
	93
	94	p.warn This stage is not (and probably will never be) implemented.
	95
	96	p.
	97	During the game one of the two players can decide to take control of the
	98	checkered pieces.
	99	They thus become autonomous and vulnerable to being captured - stage 2 begins.
	100	The other player is in charge of both the white and black pieces, and tries to
	101	eliminate checkered pieces.
	102	The checkered side wins by checkmating either the white or black king.
	103
	104	h4 Variant of stage 2
	105	p.
	106	An observer could decide to join the game by taking the checkered pieces
	107	at any moment.
	108	It then becomes a chess game with three players, with some subtelties to be resolved.
	109	It was tested in some (real life) games organised by the variant creator.
	110
	111	h3 Special moves
	112
	113	p Checkered pawns can...
	114	ul
	115	li move and capture in either direction;
	116	li take en passant,
	117	li be promoted on either the first or eighth row.
	118
	119	h3 Credits
	120
	121	ul
	122	li.
	123	The rules of Checkered Chess were thought up by Patrick Bernier and developed
	124	with the help of Benjamin Auder.
	125	li.
	126	Thanks also to Olive Martin, Christian Poisson, Bevis Martin, Laurent Nouhaud
	127	and Frédéric Fradet.