Generalize pawn movements: cleaner and smaller code
[vchess.git] / client / src / variants / Losers.js
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1import { ChessRules } from "@/base_rules";
2import { ArrayFun } from "@/utils/array";
3import { randInt } from "@/utils/alea";
4
32f6285e 5export class LosersRules extends ChessRules {
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6 // Trim all non-capturing moves
7 static KeepCaptures(moves) {
8 return moves.filter(m => m.vanish.length == 2);
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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 =>
21 // Warning: duscard castle moves
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() {
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40 const moves = super.getAllValidMoves();
41 if (moves.some(m => m.vanish.length == 2)) return V.KeepCaptures(moves);
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42 return moves;
43 }
44
6808d7a1 45 getCurrentScore() {
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46 // If only my king remains, I win
47 const color = this.turn;
48 let onlyKing = true;
49 outerLoop: for (let i=0; i<V.size.x; i++) {
50 for (let j=0; j<V.size.y; j++) {
51 if (
52 this.board[i][j] != V.EMPTY &&
53 this.getColor(i,j) == color &&
54 this.getPiece(i,j) != V.KING
55 ) {
56 onlyKing = false;
57 break outerLoop;
58 }
59 }
60 }
61 if (onlyKing) return color == "w" ? "1-0" : "0-1";
62 if (this.atLeastOneMove()) return "*";
63 // No valid move: the side who cannot move (or is checkmated) wins
6808d7a1 64 return this.turn == "w" ? "1-0" : "0-1";
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65 }
66
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67 static get SEARCH_DEPTH() {
68 return 4;
69 }
dac39588 70
6808d7a1 71 evalPosition() {
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72 // Less material is better (more subtle in fact but...)
73 return -super.evalPosition();
dac39588 74 }
6808d7a1 75};