[vchess.git] / client / client_OLD / views / rules / Baroque / en.pug

p.boxed
	| Most pieces look the same but behave very differently.
	| They generally move like an orthodox queen,
	| but capturing rules are complex.

p
	| Note: 'Baroque' is the initial name thought by the author,
	| but 'Ultima' is also largely adopted.
	a(href="https://www.chessvariants.com/people.dir/abbott.html")
		| He prefers 'Baroque'
	| , and I think me too.

h3 Specifications

ul
	li Chessboard: standard.
	li Material: "standard".
	li Non-capturing moves: often like queen.
	li Special moves: none.
	li Captures: very special.
	li End of game: standard; see below.

h4 Pieces names

p Pieces names refer to the way they capture, which is described later.
ul
	li Pawn : pawn or pincer
	li Rook : coordinator
	li Knight : long leaper
	li Bishop : chameleon
	li Queen : withdrawer
	li King : king (same behavior as in standard chess)
p.
	Besides, a new piece is introduced: the immobilizer, written by the letter 'm'
	in FEN diagrams and PGN games. It is represented by an upside-down rook:

figure.diagram-container
	.diagram
		| fen:8/8/4m3/8/8/8/3M4/8:
	figcaption Immobilizers on d2 and e6.

h3 Non-capturing moves

p.
	Pawns move as orthodox rooks, and the king moves as usual,
	one square in any direction.
	All other pieces move like an orthodox queen.

p.
	When a piece is adjacent to an enemy immobilizer, it cannot move unless
	the enemy immobilizer is adjacent to a friendly immobilizer or chameleon
	(cancelling the powers of the opponent's immobilizer).
p
	| Note : this corresponds to the "pure rules" described on 
	a(href="http://www.inference.org.uk/mackay/ultima/ultima.html") this page
	| , which slightly differ from the initial rules.
	| The aim is to get rid of the weird suicide rule by weakening the immobilizers lock.
	| In particular, in the original rules two adjacent immobilizer are stuck forever
	| until one is captured. Note that it's still the case if all chameleons disappeared.

h3 Capturing moves

p.
	Easy case first: the king captures as usual, by moving onto an adjacent square
	occupied by an enemy piece. But this is the only piece following orthodox rules,
	and also the only one which captures by moving onto an occupied square.
	All other pieces capture passively: they land on a free square and captured
	units are determined by some characteristics of the movement.

p Note 1: the immobilizer does not capture.

p.
	Note 2: for passive captures, a 'X' is added at the end of the move notation,
	to indicate that something was taken (replaying the game is necessary to know where).

h4 Pawns/Pincers

p.
	If at the end of its movement a pawn is horizontally or vertically adjacent to an
	enemy piece, which itself is next to a friendly piece (in the same direction),
	the "pinced" unit is removed from the board.

figure.diagram-container
	.diagram
		| fen:7k/5ppp/2N5/2n5/3rB3/8/PPP5/K7:
	figcaption 1.Pc2c4 captures both coordinator and long leaper.

h4 Coordinators (rooks)

p.
	Imagine that rook and king of the same color are two corners of a rectangle
	(this works if these two pieces are unaligned).
	If at the end of a rook move an enemy piece stands in any of the two remaining
	corners, it is captured.

figure.diagram-container
	.diagram
		| fen:8/2b4K/2q5/3p1N1p/8/8/2R5/k7:
	figcaption 1.Rc5 captures on c7 and h5.

h4 Long leapers (knights)

p.
	A knight captures exactly as a queen in international draughts game: by jumping
	over its enemies, as many times as it can/want but always in the same direction.
	In this respect it is less powerful than a draughts' queen:
	on the following diagram c8 or f6 cannot be captured.
	However, the knight does not have to maximize the number of captured units
	(as is the case in draughts).

figure.diagram-container
	.diagram
		| fen:2n4k/3r4/5b2/3p4/1m6/3b4/3N4/K7 d4,d6,d8,a5:
	figcaption All marked squares captures are playable from d2.

h4 Withdrawer (queen)

p.
	The queen captures by moving away from an adjacent enemy piece, in the opposite
	direction (without jumping, the path must be free).

figure.diagram-container
	.diagram
		| fen:7k/8/8/3Qr3/8/8/8/K7 a5,b5,c5:
	figcaption 1.Qa5, 1.Qb5 or 1.Qc5 captures the black rook.

h4 Chameleon (bishop)

p The chameleon captures pieces in the way they would capture. So, it
ul
	li pinces pawns (if moving like a pawn),
	li withdraws from withdrawers,
	li leaps over long leapers,
	li coordinates coordinators.
p ...and these captures can be combined.

p.
	Remark: the move indicated on the diagram doesn't capture the black pincer
	on e5, since it is a diagonal move (not like a pawn).

figure.diagram-container
	.diagram
		| fen:7k/8/8/r3pP2/2n5/8/B7/K7 a5,c4:
	figcaption 1.Bd5 captures the two marked pieces.

p.
	Besides, chameleon immobilizes immobilizers (but cannot capture them since they
	do not capture).

p.
	A chameleon captures the king in the same way the king captures, which means that
	a chameleon adjacent to a king gives check.

h3 End of the game

p.
	Checkmate or stalemate as in standard chess. Note however that checks are more
	difficult to see, because of the exotic capturing rules. For example, on the
	following diagram the white king cannot move to e5 because then
	the black pawn could capture by moving next to it.

figure.diagram-container
	.diagram
		| fen:7k/8/8/p4r/4K3/8/8/8 e5:
	figcaption 1.Ke5 is impossible

h3 More information

p.
	| A good starting point is the 
	a(href="https://en.wikipedia.org/wiki/Baroque_chess") Wikipedia page
	| , which also gives pointers to other interesting pages (including
	| chessvariants.com, as usual).
Commit	Line	Data
	1	p.boxed
	2	\| Most pieces look the same but behave very differently.
	3	\| They generally move like an orthodox queen,
	4	\| but capturing rules are complex.
	5
	6	p
	7	\| Note: 'Baroque' is the initial name thought by the author,
	8	\| but 'Ultima' is also largely adopted.
	9	a(href="https://www.chessvariants.com/people.dir/abbott.html")
	10	\| He prefers 'Baroque'
	11	\| , and I think me too.
	12
	13	h3 Specifications
	14
	15	ul
	16	li Chessboard: standard.
	17	li Material: "standard".
	18	li Non-capturing moves: often like queen.
	19	li Special moves: none.
	20	li Captures: very special.
	21	li End of game: standard; see below.
	22
	23	h4 Pieces names
	24
	25	p Pieces names refer to the way they capture, which is described later.
	26	ul
	27	li Pawn : pawn or pincer
	28	li Rook : coordinator
	29	li Knight : long leaper
	30	li Bishop : chameleon
	31	li Queen : withdrawer
	32	li King : king (same behavior as in standard chess)
	33	p.
	34	Besides, a new piece is introduced: the immobilizer, written by the letter 'm'
	35	in FEN diagrams and PGN games. It is represented by an upside-down rook:
	36
	37	figure.diagram-container
	38	.diagram
	39	\| fen:8/8/4m3/8/8/8/3M4/8:
	40	figcaption Immobilizers on d2 and e6.
	41
	42	h3 Non-capturing moves
	43
	44	p.
	45	Pawns move as orthodox rooks, and the king moves as usual,
	46	one square in any direction.
	47	All other pieces move like an orthodox queen.
	48
	49	p.
	50	When a piece is adjacent to an enemy immobilizer, it cannot move unless
	51	the enemy immobilizer is adjacent to a friendly immobilizer or chameleon
	52	(cancelling the powers of the opponent's immobilizer).
	53	p
	54	\| Note : this corresponds to the "pure rules" described on
	55	a(href="http://www.inference.org.uk/mackay/ultima/ultima.html") this page
	56	\| , which slightly differ from the initial rules.
	57	\| The aim is to get rid of the weird suicide rule by weakening the immobilizers lock.
	58	\| In particular, in the original rules two adjacent immobilizer are stuck forever
	59	\| until one is captured. Note that it's still the case if all chameleons disappeared.
	60
	61	h3 Capturing moves
	62
	63	p.
	64	Easy case first: the king captures as usual, by moving onto an adjacent square
	65	occupied by an enemy piece. But this is the only piece following orthodox rules,
	66	and also the only one which captures by moving onto an occupied square.
	67	All other pieces capture passively: they land on a free square and captured
	68	units are determined by some characteristics of the movement.
	69
	70	p Note 1: the immobilizer does not capture.
	71
	72	p.
	73	Note 2: for passive captures, a 'X' is added at the end of the move notation,
	74	to indicate that something was taken (replaying the game is necessary to know where).
	75
	76	h4 Pawns/Pincers
	77
	78	p.
	79	If at the end of its movement a pawn is horizontally or vertically adjacent to an
	80	enemy piece, which itself is next to a friendly piece (in the same direction),
	81	the "pinced" unit is removed from the board.
	82
	83	figure.diagram-container
	84	.diagram
	85	\| fen:7k/5ppp/2N5/2n5/3rB3/8/PPP5/K7:
	86	figcaption 1.Pc2c4 captures both coordinator and long leaper.
	87
	88	h4 Coordinators (rooks)
	89
	90	p.
	91	Imagine that rook and king of the same color are two corners of a rectangle
	92	(this works if these two pieces are unaligned).
	93	If at the end of a rook move an enemy piece stands in any of the two remaining
	94	corners, it is captured.
	95
	96	figure.diagram-container
	97	.diagram
	98	\| fen:8/2b4K/2q5/3p1N1p/8/8/2R5/k7:
	99	figcaption 1.Rc5 captures on c7 and h5.
	100
	101	h4 Long leapers (knights)
	102
	103	p.
	104	A knight captures exactly as a queen in international draughts game: by jumping
	105	over its enemies, as many times as it can/want but always in the same direction.
	106	In this respect it is less powerful than a draughts' queen:
	107	on the following diagram c8 or f6 cannot be captured.
	108	However, the knight does not have to maximize the number of captured units
	109	(as is the case in draughts).
	110
	111	figure.diagram-container
	112	.diagram
	113	\| fen:2n4k/3r4/5b2/3p4/1m6/3b4/3N4/K7 d4,d6,d8,a5:
	114	figcaption All marked squares captures are playable from d2.
	115
	116	h4 Withdrawer (queen)
	117
	118	p.
	119	The queen captures by moving away from an adjacent enemy piece, in the opposite
	120	direction (without jumping, the path must be free).
	121
	122	figure.diagram-container
	123	.diagram
	124	\| fen:7k/8/8/3Qr3/8/8/8/K7 a5,b5,c5:
	125	figcaption 1.Qa5, 1.Qb5 or 1.Qc5 captures the black rook.
	126
	127	h4 Chameleon (bishop)
	128
	129	p The chameleon captures pieces in the way they would capture. So, it
	130	ul
	131	li pinces pawns (if moving like a pawn),
	132	li withdraws from withdrawers,
	133	li leaps over long leapers,
	134	li coordinates coordinators.
	135	p ...and these captures can be combined.
	136
	137	p.
	138	Remark: the move indicated on the diagram doesn't capture the black pincer
	139	on e5, since it is a diagonal move (not like a pawn).
	140
	141	figure.diagram-container
	142	.diagram
	143	\| fen:7k/8/8/r3pP2/2n5/8/B7/K7 a5,c4:
	144	figcaption 1.Bd5 captures the two marked pieces.
	145
	146	p.
	147	Besides, chameleon immobilizes immobilizers (but cannot capture them since they
	148	do not capture).
	149
	150	p.
	151	A chameleon captures the king in the same way the king captures, which means that
	152	a chameleon adjacent to a king gives check.
	153
	154	h3 End of the game
	155
	156	p.
	157	Checkmate or stalemate as in standard chess. Note however that checks are more
	158	difficult to see, because of the exotic capturing rules. For example, on the
	159	following diagram the white king cannot move to e5 because then
	160	the black pawn could capture by moving next to it.
	161
	162	figure.diagram-container
	163	.diagram
	164	\| fen:7k/8/8/p4r/4K3/8/8/8 e5:
	165	figcaption 1.Ke5 is impossible
	166
	167	h3 More information
	168
	169	p.
	170	\| A good starting point is the
	171	a(href="https://en.wikipedia.org/wiki/Baroque_chess") Wikipedia page
	172	\| , which also gives pointers to other interesting pages (including
	173	\| chessvariants.com, as usual).