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a6abf094 BA |
1 | class LoserRules extends ChessRules |
2 | { | |
3 | initVariables(fen) | |
4 | { | |
5 | // No castling, hence no flags | |
6 | const epSq = this.moves.length > 0 ? this.getEpSquare(this.lastMove) : undefined; | |
7 | this.epSquares = [ epSq ]; | |
8 | } | |
9 | ||
10 | setFlags(fen) { } | |
11 | ||
12 | getPotentialPawnMoves([x,y]) | |
13 | { | |
14 | let moves = super.getPotentialPawnMoves([x,y]); | |
15 | ||
16 | // Complete with promotion(s) into king, if possible | |
17 | const color = this.turn; | |
18 | const V = VariantRules; | |
19 | const [sizeX,sizeY] = VariantRules.size; | |
20 | const shift = (color == "w" ? -1 : 1); | |
21 | const lastRank = (color == "w" ? 0 : sizeX-1); | |
22 | if (x+shift == lastRank) | |
23 | { | |
24 | let p = V.KING; | |
25 | // Normal move | |
26 | if (this.board[x+shift][y] == V.EMPTY) | |
27 | moves.push(this.getBasicMove([x,y], [x+shift,y], {c:color,p:p})); | |
28 | // Captures | |
29 | if (y>0 && this.canTake([x,y], [x+shift,y-1]) && this.board[x+shift][y-1] != V.EMPTY) | |
30 | moves.push(this.getBasicMove([x,y], [x+shift,y-1], {c:color,p:p})); | |
31 | if (y<sizeY-1 && this.canTake([x,y], [x+shift,y+1]) && this.board[x+shift][y+1] != V.EMPTY) | |
32 | moves.push(this.getBasicMove([x,y], [x+shift,y+1], {c:color,p:p})); | |
33 | } | |
34 | ||
35 | return moves; | |
36 | } | |
37 | ||
38 | getPotentialKingMoves(sq) | |
39 | { | |
40 | const V = VariantRules; | |
41 | return this.getSlideNJumpMoves(sq, | |
42 | V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep"); | |
43 | } | |
44 | ||
45 | // Stop at the first capture found (if any) | |
46 | atLeastOneCapture() | |
47 | { | |
48 | const color = this.turn; | |
49 | const oppCol = this.getOppCol(color); | |
50 | const [sizeX,sizeY] = VariantRules.size; | |
51 | for (let i=0; i<sizeX; i++) | |
52 | { | |
53 | for (let j=0; j<sizeY; j++) | |
54 | { | |
55 | if (this.board[i][j] != VariantRules.EMPTY && this.getColor(i,j) != oppCol) | |
56 | { | |
57 | const moves = this.getPotentialMovesFrom([i,j]); | |
58 | if (moves.length > 0) | |
59 | { | |
60 | for (let k=0; k<moves.length; k++) | |
61 | { | |
62 | if (moves[k].vanish.length==2 && this.filterValid([moves[k]]).length > 0) | |
63 | return true; | |
64 | } | |
65 | } | |
66 | } | |
67 | } | |
68 | } | |
69 | return false; | |
70 | } | |
71 | ||
72 | // Trim all non-capturing moves | |
73 | static KeepCaptures(moves) | |
74 | { | |
75 | return moves.filter(m => { return m.vanish.length == 2; }); | |
76 | } | |
77 | ||
78 | getPossibleMovesFrom(sq) | |
79 | { | |
80 | let moves = this.filterValid( this.getPotentialMovesFrom(sq) ); | |
81 | // This is called from interface: we need to know if a capture is possible | |
82 | if (this.atLeastOneCapture()) | |
83 | moves = VariantRules.KeepCaptures(moves); | |
84 | return moves; | |
85 | } | |
86 | ||
87 | getAllValidMoves() | |
88 | { | |
89 | let moves = super.getAllValidMoves(); | |
90 | if (moves.some(m => { return m.vanish.length == 2; })) | |
91 | moves = VariantRules.KeepCaptures(moves); | |
92 | return moves; | |
93 | } | |
94 | ||
95 | underCheck(move) | |
96 | { | |
97 | return false; //No notion of check | |
98 | } | |
99 | ||
100 | getCheckSquares(move) | |
101 | { | |
102 | return []; | |
103 | } | |
104 | ||
105 | play(move, ingame) | |
106 | { | |
107 | if (!!ingame) | |
108 | move.notation = this.getNotation(move); | |
109 | this.moves.push(move); | |
110 | this.epSquares.push( this.getEpSquare(move) ); | |
111 | VariantRules.PlayOnBoard(this.board, move); | |
112 | } | |
113 | ||
114 | undo(move) | |
115 | { | |
116 | VariantRules.UndoOnBoard(this.board, move); | |
117 | this.epSquares.pop(); | |
118 | this.moves.pop(); | |
119 | } | |
120 | ||
121 | checkGameEnd() | |
122 | { | |
123 | // No valid move: you win! | |
124 | return this.turn == "w" ? "1-0" : "0-1"; | |
125 | } | |
126 | ||
127 | static get VALUES() { //experimental... | |
128 | return { | |
129 | 'p': 1, | |
130 | 'r': 7, | |
131 | 'n': 3, | |
132 | 'b': 3, | |
133 | 'q': 5, | |
134 | 'k': 5 | |
135 | }; | |
136 | } | |
137 | ||
138 | static get SEARCH_DEPTH() { return 4; } | |
139 | ||
140 | evalPosition() | |
141 | { | |
142 | return - super.evalPosition(); //better with less material | |
143 | } | |
144 | } |