e368afa5ea99bfcfc5cd5ce31034b0f250023b95
[vchess.git] / client / src / translations / rules / Baroque / en.pug
1 p.boxed
2 | Pieces generally move like an orthodox queen,
3 | but capturing rules are quite complex.
4
5 p
6 | Note: 'Baroque' is the initial name thought by the author,
7 | but 'Ultima' is also largely adopted.
8 a(href="https://www.chessvariants.com/people.dir/abbott.html")
9 | He prefers 'Baroque'
10 | , and I think me too.
11
12 h4 Pieces names
13
14 p Pieces names refer to the way they capture, which is described later.
15 ul
16 li Pawn : Pawn or Pincer
17 li Rook : Coordinator
18 li Knight : Long Leaper
19 li Bishop : Chameleon
20 li Queen : Withdrawer
21 li King : King (same behavior as in standard chess)
22 p.
23 Besides, a new piece is introduced: the immobilizer, written by the letter
24 'm' in FEN diagrams and PGN games. It is represented by an upside-down rook:
25
26 figure.diagram-container
27 .diagram
28 | fen:8/8/4m3/8/8/8/3M4/8:
29 figcaption Immobilizers on d2 and e6.
30
31 h3 Non-capturing moves
32
33 p.
34 Pawns move as orthodox rooks, and the king moves as usual,
35 one square in any direction.
36 All other pieces move like an orthodox queen.
37
38 p.
39 When a piece is adjacent to an enemy immobilizer, it cannot move unless
40 the enemy immobilizer is adjacent to a friendly immobilizer or chameleon
41 (cancelling the powers of the opponent's immobilizer).
42 p
43 | Note : this corresponds to the "pure rules" described on
44 a(href="http://www.inference.org.uk/mackay/ultima/ultima.html") this page
45 | , which slightly differ from the initial rules.
46 | The aim is to get rid of the weird suicide rule by weakening the
47 | immobilizers lock. In particular, in the original rules two adjacent
48 | immobilizer are stuck forever until one is captured. Note that it's still
49 | the case if all chameleons disappeared.
50
51 h3 Capturing moves
52
53 p.
54 Easy case first: the king captures as usual, by moving onto an adjacent
55 square occupied by an enemy piece. But this is the only piece following
56 orthodox rules, and also the only one which captures by moving onto an
57 occupied square. All other pieces capture passively: they land on a free
58 square and captured units are determined by some characteristics of the
59 movement.
60
61 p Note 1: the immobilizer does not capture.
62
63 p.
64 Note 2: for passive captures, a 'X' is added at the end of the move notation,
65 to indicate that something was taken (replaying the game is necessary to know
66 where).
67
68 h4 Pawns/Pincers
69
70 p.
71 If at the end of its movement a pawn is horizontally or vertically adjacent
72 to an enemy piece, which itself is next to a friendly piece (in the same
73 direction), the "pinced" unit is removed from the board.
74
75 figure.diagram-container
76 .diagram
77 | fen:7k/5ppp/2N5/2n5/3rB3/8/PPP5/K7:
78 figcaption 1.Pc2c4 captures both coordinator and long leaper.
79
80 h4 Coordinators (rooks)
81
82 p.
83 Imagine that rook and king of the same color are two corners of a rectangle
84 (this works if these two pieces are unaligned).
85 If at the end of a rook move an enemy piece stands in any of the two
86 remaining corners, it is captured.
87
88 figure.diagram-container
89 .diagram
90 | fen:8/2b4K/2q5/3p1N1p/8/8/2R5/k7:
91 figcaption 1.Rc5 captures on c7 and h5.
92
93 h4 Long leapers (knights)
94
95 p.
96 A knight captures exactly as a queen in international draughts game: by
97 jumping over its enemies, as many times as it can/want but always in the same
98 direction. In this respect it is less powerful than a draughts' queen:
99 on the following diagram c8 or f6 cannot be captured.
100 However, the knight does not have to maximize the number of captured units
101 (as is the case in draughts).
102
103 figure.diagram-container
104 .diagram
105 | fen:2n4k/3r4/5b2/3p4/1m6/3b4/3N4/K7 d4,d6,d8,a5:
106 figcaption All marked squares captures are playable from d2.
107
108 h4 Withdrawer (queen)
109
110 p.
111 The queen captures by moving away from an adjacent enemy piece, in the
112 opposite direction (without jumping, the path must be free).
113
114 figure.diagram-container
115 .diagram
116 | fen:7k/8/8/3Qr3/8/8/8/K7 a5,b5,c5:
117 figcaption 1.Qa5, 1.Qb5 or 1.Qc5 captures the black rook.
118
119 h4 Chameleon (bishop)
120
121 p The chameleon captures pieces in the way they would capture. So, it
122 ul
123 li pinces pawns (if moving like a pawn),
124 li withdraws from withdrawers,
125 li leaps over long leapers,
126 li coordinates coordinators.
127 p ...and these captures can be combined.
128
129 p.
130 Remark: the move indicated on the diagram doesn't capture the black pincer
131 on e5, since it is a diagonal move (not like a pawn).
132
133 figure.diagram-container
134 .diagram
135 | fen:7k/8/8/r3pP2/2n5/8/B7/K7 a5,c4:
136 figcaption 1.Bd5 captures the two marked pieces.
137
138 p.
139 Besides, chameleon immobilizes immobilizers (but cannot capture them since
140 they do not capture).
141
142 p.
143 A chameleon captures the king in the same way the king captures, which means
144 that a chameleon adjacent to a king gives check.
145
146 h3 End of the game
147
148 p.
149 The game ends by checkmate or stalemate as in standard chess. Note however
150 that checks are more difficult to see, because of the exotic capturing rules.
151 For example, on the following diagram the white king cannot move to e5
152 because then the black pawn could capture by moving next to it.
153
154 figure.diagram-container
155 .diagram
156 | fen:7k/8/8/p4r/4K3/8/8/8 e5:
157 figcaption 1.Ke5 is impossible
158
159 h3 More information
160
161 p
162 | A good starting point is the
163 a(href="https://en.wikipedia.org/wiki/Baroque_chess") Wikipedia page
164 | , which also gives pointers to other interesting pages (including
165 | chessvariants.com, as usual).
166
167 p Inventor: Robert Abbott (1963)