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1 | import { ChessRules } from "@/base_rules"; |
2 | import { ArrayFun } from "@/utils/array"; | |
3 | import { randInt } from "@/utils/alea"; | |
4 | ||
32f6285e | 5 | export class LosersRules extends ChessRules { |
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6 | // Trim all non-capturing moves |
7 | static KeepCaptures(moves) { | |
57d9b2c4 | 8 | return moves.filter(m => m.vanish.length == 2 && m.appear.length == 1); |
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9 | } |
10 | ||
6b7b2cf7 | 11 | // Stop at the first capture found (if any) |
6808d7a1 | 12 | atLeastOneCapture() { |
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13 | const color = this.turn; |
14 | const oppCol = V.GetOppCol(color); | |
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15 | for (let i = 0; i < V.size.x; i++) { |
16 | for (let j = 0; j < V.size.y; j++) { | |
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17 | if ( |
18 | this.board[i][j] != V.EMPTY && | |
19 | this.getColor(i, j) != oppCol && | |
20 | this.getPotentialMovesFrom([i, j]).some(m => | |
57d9b2c4 | 21 | // Warning: discard castle moves |
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22 | m.vanish.length == 2 && m.appear.length == 1) |
23 | ) { | |
24 | return true; | |
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25 | } |
26 | } | |
27 | } | |
28 | return false; | |
29 | } | |
30 | ||
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31 | getPossibleMovesFrom(sq) { |
32 | let moves = this.filterValid(this.getPotentialMovesFrom(sq)); | |
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33 | const captureMoves = V.KeepCaptures(moves); |
34 | if (captureMoves.length > 0) return captureMoves; | |
35 | if (this.atLeastOneCapture()) return []; | |
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36 | return moves; |
37 | } | |
38 | ||
6808d7a1 | 39 | getAllValidMoves() { |
6b7b2cf7 | 40 | const moves = super.getAllValidMoves(); |
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41 | if (moves.some(m => m.vanish.length == 2 && m.appear.length == 1)) |
42 | return V.KeepCaptures(moves); | |
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43 | return moves; |
44 | } | |
45 | ||
6808d7a1 | 46 | getCurrentScore() { |
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47 | // If only my king remains, I win |
48 | const color = this.turn; | |
49 | let onlyKing = true; | |
50 | outerLoop: for (let i=0; i<V.size.x; i++) { | |
51 | for (let j=0; j<V.size.y; j++) { | |
52 | if ( | |
53 | this.board[i][j] != V.EMPTY && | |
54 | this.getColor(i,j) == color && | |
55 | this.getPiece(i,j) != V.KING | |
56 | ) { | |
57 | onlyKing = false; | |
58 | break outerLoop; | |
59 | } | |
60 | } | |
61 | } | |
62 | if (onlyKing) return color == "w" ? "1-0" : "0-1"; | |
63 | if (this.atLeastOneMove()) return "*"; | |
64 | // No valid move: the side who cannot move (or is checkmated) wins | |
6808d7a1 | 65 | return this.turn == "w" ? "1-0" : "0-1"; |
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66 | } |
67 | ||
6808d7a1 | 68 | evalPosition() { |
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69 | // Less material is better (more subtle in fact but...) |
70 | return -super.evalPosition(); | |
dac39588 | 71 | } |
6808d7a1 | 72 | }; |