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1d184b4c | 1 | p.boxed |
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2 | | The capture of an enemy piece produces a new "checkered" piece belonging |
3 | | to both players. | |
1d184b4c | 4 | |
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5 | figure.showPieces.text-center |
6 | img(src="/images/pieces/Checkered/cp.svg") | |
7 | img(src="/images/pieces/Checkered/cr.svg") | |
8 | img(src="/images/pieces/Checkered/cn.svg") | |
9 | img(src="/images/pieces/Checkered/cb.svg") | |
10 | img(src="/images/pieces/Checkered/cq.svg") | |
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11 | figcaption Checkered pieces, born after captures. |
12 | ||
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13 | p Note: the initial French name for this variant is "l'Échiqueté". |
14 | ||
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15 | h3 Specifications |
16 | ||
17 | ul | |
18 | li Chessboard: standard. | |
19 | li Material: additional checkered pieces. | |
20 | li Non-capturing moves: standard; see below. | |
21 | li Special moves: standard; see below. | |
22 | li Captures: standard; see below. | |
23 | li End of game: standard. | |
24 | ||
25 | p The game potentially evolves in two stages. | |
26 | ||
27 | h2.stageDelimiter Stage 1 | |
28 | ||
29 | h3 Basics | |
30 | ||
31 | ol | |
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32 | li |
33 | | Each capture produces a new piece, taking on nature of | |
34 | | the capturing or captured one. | |
35 | li | |
36 | | The new piece arising from a capture has a new color: | |
37 | | "checkered", as illustrated above. | |
38 | li | |
39 | | All checkered pieces belong to the player in turn and can | |
40 | | capture the opponents pieces. | |
1d184b4c | 41 | |
4bd00ce3 | 42 | p Remarks: |
1d184b4c | 43 | ul |
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44 | li. |
45 | A non-capturing checkered move cannot be "undone" right after since | |
46 | this would repeat the same position. | |
2316f8b8 | 47 | li Checkered pieces cannot be captured. |
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48 | |
49 | figure.diagram-container | |
50 | .diagram | |
51 | | fen:2kr4/pp6/2p5/4ss1r/1P2ns1P/2Np4/P1P1P1BP/R2o1RK1: | |
52 | figcaption. | |
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53 | Black plays Rxh4=P. (Checkered pawn to) h5 is allowed then, |
54 | because piece's nature changed. | |
1d184b4c | 55 | |
e8e4adbd | 56 | h3 Pions |
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57 | |
58 | ul | |
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59 | li. |
60 | Pawns can jump two squares only from their initial rank, and only once in the game: | |
61 | a checkered pawn returning on the pawns' start rank cannot jump. However: | |
62 | li. | |
63 | A pawn captured on its starting square (thus becoming "checkered") keeps the | |
64 | right to advance two squares. | |
65 | li. | |
66 | Checkered pawns cannot capture en passant, because while the pawn was "passing" | |
67 | they were of the same color. | |
1d184b4c | 68 | |
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69 | p.bold.bigfont If you wanna play, you can stop reading here. |
70 | ||
71 | h3 Stalemate or checkmate? | |
72 | ||
73 | p. | |
74 | The following diagram seems to show a mating pattern, but the king if | |
75 | "attacked" by a checkered pawn – which still belongs to white. | |
76 | Therefore, it can be considered that it's not really a check because | |
77 | white is unable to "give back the turn". | |
78 | Without the black bishop on a7 it would be mate (without debate), because | |
79 | the king could virtually go to g1 before being captured by the pawn-chamaleon. | |
80 | ||
81 | figure.diagram-container | |
82 | .diagram | |
83 | | fen:7k/b5pp/8/8/8/8/6ss/7K: | |
84 | figcaption After 1...g2+(#?) | |
85 | ||
86 | p. | |
87 | The interface considers that it's mate in both cases, following the idea | |
88 | "it's checkmate if we cannot move, and the opponent on its turn could | |
89 | take the king" (maybe after an impossible move). | |
90 | ||
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91 | h2.stageDelimiter Stage 2 |
92 | ||
6752407b | 93 | p.warn This stage is not (and probably will never be) implemented. |
e7cfa68d | 94 | |
1d184b4c | 95 | p. |
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96 | During the game one of the two players can decide to take control of the |
97 | checkered pieces. | |
1d184b4c | 98 | They thus become autonomous and vulnerable to being captured - stage 2 begins. |
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99 | The other player is in charge of both the white and black pieces, and tries to |
100 | eliminate checkered pieces. | |
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101 | The checkered side wins by checkmating either the white or black king. |
102 | ||
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103 | h4 Variant of stage 2 |
104 | p. | |
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105 | An observer could decide to join the game by taking the checkered pieces |
106 | at any moment. | |
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107 | It then becomes a chess game with three players, with some subtelties to be resolved. |
108 | It was tested in some (real life) games organised by the variant creator. | |
109 | ||
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110 | h3 Special moves |
111 | ||
4bd00ce3 | 112 | p Checkered pawns can... |
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113 | ul |
114 | li move and capture in either direction; | |
115 | li take en passant, | |
116 | li be promoted on either the first or eighth row. | |
117 | ||
118 | h3 Credits | |
119 | ||
120 | ul | |
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121 | li. |
122 | The rules of Checkered Chess were thought up by Patrick Bernier and developed | |
123 | with the help of Benjamin Auder. | |
124 | li. | |
125 | Thanks also to Olive Martin, Christian Poisson, Bevis Martin, Laurent Nouhaud | |
126 | and Frédéric Fradet. |