Konane: simplify code, easier gameplay
[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 {
7e8a7ea1 6
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7 // Trim all non-capturing moves
8 static KeepCaptures(moves) {
57d9b2c4 9 return moves.filter(m => m.vanish.length == 2 && m.appear.length == 1);
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10 }
11
801e2870 12 // Stop at the first capture found (if any)
6808d7a1 13 atLeastOneCapture() {
dac39588 14 const color = this.turn;
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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 &&
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19 this.getColor(i, j) == color &&
20 this.getPotentialMovesFrom([i, j]).some(m => {
21 return (
22 // Warning: discard castle moves
23 m.vanish.length == 2 && m.appear.length == 1 &&
24 this.filterValid([m]).length == 1
25 );
26 })
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27 ) {
28 return true;
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29 }
30 }
31 }
32 return false;
33 }
34
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35 getPossibleMovesFrom(sq) {
36 let moves = this.filterValid(this.getPotentialMovesFrom(sq));
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37 const captureMoves = V.KeepCaptures(moves);
38 if (captureMoves.length > 0) return captureMoves;
39 if (this.atLeastOneCapture()) return [];
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40 return moves;
41 }
42
6808d7a1 43 getAllValidMoves() {
6b7b2cf7 44 const moves = super.getAllValidMoves();
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45 if (moves.some(m => m.vanish.length == 2 && m.appear.length == 1))
46 return V.KeepCaptures(moves);
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47 return moves;
48 }
49
6808d7a1 50 getCurrentScore() {
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51 // If only my king remains, I win
52 const color = this.turn;
53 let onlyKing = true;
54 outerLoop: for (let i=0; i<V.size.x; i++) {
55 for (let j=0; j<V.size.y; j++) {
56 if (
57 this.board[i][j] != V.EMPTY &&
58 this.getColor(i,j) == color &&
59 this.getPiece(i,j) != V.KING
60 ) {
61 onlyKing = false;
62 break outerLoop;
63 }
64 }
65 }
66 if (onlyKing) return color == "w" ? "1-0" : "0-1";
67 if (this.atLeastOneMove()) return "*";
68 // No valid move: the side who cannot move (or is checkmated) wins
6808d7a1 69 return this.turn == "w" ? "1-0" : "0-1";
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70 }
71
6808d7a1 72 evalPosition() {
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73 // Less material is better (more subtle in fact but...)
74 return -super.evalPosition();
dac39588 75 }
7e8a7ea1 76
6808d7a1 77};