Small fix in rules rendering
[vchess.git] / client / src / rules / Baroque / en.pug
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32cfcea4 1p.boxed
2f3c8451 2 | Most pieces look the same but behave very differently.
32cfcea4 3 | They generally move like an orthodox queen,
2eef6db6 4 | but capturing rules are complex.
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6p
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
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13h3 Specifications
14
15ul
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.
2f3c8451 21 li End of game: standard; see below.
32cfcea4 22
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23h4 Pieces names
24
25p Pieces names refer to the way they capture, which is described later.
26ul
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)
33p.
b41d5704 34 Besides, a new piece is introduced: the immobilizer, written by the letter 'm'
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35 in FEN diagrams and PGN games. It is represented by an upside-down rook:
36
37figure.diagram-container
38 .diagram
39 | fen:8/8/4m3/8/8/8/3M4/8:
40 figcaption Immobilizers on d2 and e6.
41
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42h3 Non-capturing moves
43
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44p.
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.
15c1295a 48
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49p.
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).
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53p
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.
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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.
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60
61h3 Capturing moves
62
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63p.
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.
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70p Note 1: the immobilizer does not capture.
71
72p.
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).
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75
76h4 Pawns/Pincers
77
78p.
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
83figure.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
88h4 Coordinators (rooks)
89
90p.
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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).
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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
96figure.diagram-container
97 .diagram
98 | fen:8/2b4K/2q5/3p1N1p/8/8/2R5/k7:
99 figcaption 1.Rc5 captures on c7 and h5.
100
101h4 Long leapers (knights)
102
103p.
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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.
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106 In this respect it is less powerful than a draughts' queen:
107 on the following diagram c8 or f6 cannot be captured.
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108 However, the knight does not have to maximize the number of captured units
109 (as is the case in draughts).
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110
111figure.diagram-container
112 .diagram
643479f8 113 | fen:2n4k/3r4/5b2/3p4/1m6/3b4/3N4/K7 d4,d6,d8,a5:
3ad85eac 114 figcaption All marked squares captures are playable from d2.
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115
116h4 Withdrawer (queen)
117
118p.
119 The queen captures by moving away from an adjacent enemy piece, in the opposite
b41d5704 120 direction (without jumping, the path must be free).
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121
122figure.diagram-container
123 .diagram
643479f8 124 | fen:7k/8/8/3Qr3/8/8/8/K7 a5,b5,c5:
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125 figcaption 1.Qa5, 1.Qb5 or 1.Qc5 captures the black rook.
126
127h4 Chameleon (bishop)
128
129p The chameleon captures pieces in the way they would capture. So, it
130ul
05084186 131 li pinces pawns (if moving like a pawn),
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132 li withdraws from withdrawers,
133 li leaps over long leapers,
134 li coordinates coordinators.
135p ...and these captures can be combined.
136
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137p.
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
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141figure.diagram-container
142 .diagram
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143 | fen:7k/8/8/r3pP2/2n5/8/B7/K7 a5,c4:
144 figcaption 1.Bd5 captures the two marked pieces.
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145
146p.
147 Besides, chameleon immobilizes immobilizers (but cannot capture them since they
148 do not capture).
149
150p.
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.
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153
154h3 End of the game
155
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156p.
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
b41d5704 159 following diagram the white king cannot move to e5 because then
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160 the black pawn could capture by moving next to it.
161
162figure.diagram-container
163 .diagram
643479f8 164 | fen:7k/8/8/p4r/4K3/8/8/8 e5:
15c1295a 165 figcaption 1.Ke5 is impossible
32cfcea4 166
e081ffe3 167h3 More information
32cfcea4 168
c75838d9 169p
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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).