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[vchess.git] / client / src / variants / Isardam.js
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059f0aa2
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1import { ChessRules } from "@/base_rules";
2
3export class IsardamRules extends ChessRules {
4
5 isImmobilized(sq) {
6 const oppCol = V.GetOppCol(this.getColor(sq[0], sq[1]));
7 const piece = this.getPiece(sq[0], sq[1]);
8 let steps = [];
9 switch (piece) {
10 // NOTE: cannot use super.isAttackedByXXX
11 // because it would call the redefined isAttackedBySlideNJump
12 // => Infinite recursive calls.
13 case V.PAWN: {
14 const forward = (oppCol == 'w' ? 1 : -1);
15 steps = [[forward, 1], [forward, -1]];
16 break;
17 }
18 case V.ROOK:
19 case V.BISHOP:
20 case V.KNIGHT:
21 steps = V.steps[piece];
22 break;
23 case V.KING:
24 case V.QUEEN:
25 steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
26 break;
27 }
28 return super.isAttackedBySlideNJump(
29 sq, oppCol, piece, steps, [V.KING, V.PAWN, V.KNIGHT].includes(piece))
30 }
31
32 getPotentialMovesFrom([x, y]) {
33 return (
34 super.getPotentialMovesFrom([x, y]).filter(m => {
35 let res = true;
36 this.play(m);
37 if (this.isImmobilized([m.end.x, m.end.y])) res = false;
38 else {
39 // Check discovered attacks
40 for (let step of V.steps[V.BISHOP].concat(V.steps[V.ROOK])) {
41 let allowedPieces = [V.QUEEN];
42 if (step[0] == 0 || step[1] == 0) allowedPieces.push(V.ROOK);
43 else allowedPieces.push(V.BISHOP);
44 let [i, j] = [m.start.x + step[0], m.start.y + step[1]];
45 while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
46 i += step[0];
47 j += step[1];
48 }
49 if (V.OnBoard(i, j)) {
50 const meet = { c: this.getColor(i, j), p: this.getPiece(i, j) };
51 if (allowedPieces.includes(meet.p)) {
52 // Search in the other direction
53 [i, j] = [m.start.x - step[0], m.start.y - step[1]];
54 while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
55 i -= step[0];
56 j -= step[1];
57 }
58 if (
59 V.OnBoard(i, j) &&
60 this.getPiece(i, j) == meet.p &&
61 this.getColor(i, j) != meet.c
62 ) {
63 res = false;
64 break;
65 }
66 }
67 }
68 }
69 }
70 this.undo(m);
71 return res;
72 })
73 );
74 }
75
4258b58c
BA
76 static get SEARCH_DEPTH() {
77 return 2;
78 }
79
059f0aa2 80};