projects / vchess.git / blame
| Commit | Line | Data |
|---|---|---|
| a6abf094 BA |
1 | class ExtinctionRules extends ChessRules |
| 2 | { | |
| 3 | initVariables(fen) | |
| 4 | { | |
| 5 | super.initVariables(fen); | |
| a6abf094 BA |
6 | this.material = |
| 7 | { | |
| 8 | "w": | |
| 9 | { | |
| 10 | [V.KING]: 1, | |
| 11 | [V.QUEEN]: 1, | |
| 12 | [V.ROOK]: 2, | |
| 13 | [V.KNIGHT]: 2, | |
| 14 | [V.BISHOP]: 2, | |
| 15 | [V.PAWN]: 8 | |
| 16 | }, | |
| 17 | "b": | |
| 18 | { | |
| 19 | [V.KING]: 1, | |
| 20 | [V.QUEEN]: 1, | |
| 21 | [V.ROOK]: 2, | |
| 22 | [V.KNIGHT]: 2, | |
| 23 | [V.BISHOP]: 2, | |
| 24 | [V.PAWN]: 8 | |
| 25 | } | |
| 26 | }; | |
| 27 | } | |
| 28 | ||
| 1221ac47 BA |
29 | getPotentialPawnMoves([x,y]) |
| 30 | { | |
| 31 | let moves = super.getPotentialPawnMoves([x,y]); | |
| 32 | // Add potential promotions into king | |
| 33 | const color = this.turn; | |
| 1221ac47 | 34 | const shift = (color == "w" ? -1 : 1); |
| 0b7d99ec | 35 | const lastRank = (color == "w" ? 0 : V.size.x-1); |
| 1221ac47 BA |
36 | |
| 37 | if (x+shift == lastRank) | |
| 38 | { | |
| 39 | // Normal move | |
| 40 | if (this.board[x+shift][y] == V.EMPTY) | |
| 41 | moves.push(this.getBasicMove([x,y], [x+shift,y], {c:color,p:V.KING})); | |
| 42 | // Captures | |
| 0b7d99ec BA |
43 | if (y>0 && this.board[x+shift][y-1] != V.EMPTY |
| 44 | && this.canTake([x,y], [x+shift,y-1])) | |
| 1221ac47 BA |
45 | { |
| 46 | moves.push(this.getBasicMove([x,y], [x+shift,y-1], {c:color,p:V.KING})); | |
| 47 | } | |
| 0b7d99ec BA |
48 | if (y<V.size.y-1 && this.board[x+shift][y+1] != V.EMPTY |
| 49 | && this.canTake([x,y], [x+shift,y+1])) | |
| 1221ac47 BA |
50 | { |
| 51 | moves.push(this.getBasicMove([x,y], [x+shift,y+1], {c:color,p:V.KING})); | |
| 52 | } | |
| 53 | } | |
| 54 | ||
| 55 | return moves; | |
| 56 | } | |
| 57 | ||
| a6abf094 BA |
58 | // TODO: verify this assertion |
| 59 | atLeastOneMove() | |
| 60 | { | |
| 61 | return true; //always at least one possible move | |
| 62 | } | |
| 63 | ||
| 64 | underCheck(move) | |
| 65 | { | |
| 66 | return false; //there is no check | |
| 67 | } | |
| 68 | ||
| 69 | getCheckSquares(move) | |
| 70 | { | |
| 71 | return []; | |
| 72 | } | |
| 73 | ||
| 74 | updateVariables(move) | |
| 75 | { | |
| 76 | super.updateVariables(move); | |
| 1221ac47 BA |
77 | // Treat the promotion case: (not the capture part) |
| 78 | if (move.appear[0].p != move.vanish[0].p) | |
| 79 | { | |
| 80 | this.material[move.appear[0].c][move.appear[0].p]++; | |
| 0b7d99ec | 81 | this.material[move.appear[0].c][V.PAWN]--; |
| 1221ac47 BA |
82 | } |
| 83 | if (move.vanish.length==2 && move.appear.length==1) //capture | |
| a6abf094 BA |
84 | this.material[move.vanish[1].c][move.vanish[1].p]--; |
| 85 | } | |
| 86 | ||
| 87 | unupdateVariables(move) | |
| 88 | { | |
| 89 | super.unupdateVariables(move); | |
| 1221ac47 BA |
90 | if (move.appear[0].p != move.vanish[0].p) |
| 91 | { | |
| 92 | this.material[move.appear[0].c][move.appear[0].p]--; | |
| 0b7d99ec | 93 | this.material[move.appear[0].c][V.PAWN]++; |
| 1221ac47 | 94 | } |
| a6abf094 BA |
95 | if (move.vanish.length==2 && move.appear.length==1) |
| 96 | this.material[move.vanish[1].c][move.vanish[1].p]++; | |
| 97 | } | |
| 98 | ||
| 99 | checkGameOver() | |
| 100 | { | |
| 101 | if (this.checkRepetition()) | |
| 102 | return "1/2"; | |
| 103 | ||
| 104 | if (this.atLeastOneMove()) // game not over? | |
| 105 | { | |
| 106 | const color = this.turn; | |
| 107 | if (Object.keys(this.material[color]).some( | |
| 108 | p => { return this.material[color][p] == 0; })) | |
| 109 | { | |
| 110 | return this.checkGameEnd(); | |
| 111 | } | |
| 112 | return "*"; | |
| 113 | } | |
| 114 | ||
| 1221ac47 BA |
115 | return this.checkGameEnd(); //NOTE: currently unreachable... |
| 116 | } | |
| 117 | ||
| 118 | checkGameEnd() | |
| 119 | { | |
| 120 | return this.turn == "w" ? "0-1" : "1-0"; | |
| a6abf094 BA |
121 | } |
| 122 | ||
| a6abf094 BA |
123 | evalPosition() |
| 124 | { | |
| 1221ac47 BA |
125 | const color = this.turn; |
| 126 | if (Object.keys(this.material[color]).some( | |
| 127 | p => { return this.material[color][p] == 0; })) | |
| 128 | { | |
| 92342261 | 129 | // Very negative (resp. positive) if white (reps. black) pieces set is incomplete |
| 0b7d99ec | 130 | return (color=="w"?-1:1) * V.INFINITY; |
| 1221ac47 | 131 | } |
| a6abf094 BA |
132 | return super.evalPosition(); |
| 133 | } | |
| 134 | } |