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0c3fe8a6 BA |
1 | import { ChessRules } from "@/base_rules"; |
2 | ||
32f6285e BA |
3 | export class ExtinctionRules extends ChessRules { |
4 | static get PawnSpecs() { | |
5 | return Object.assign( | |
6 | {}, | |
7 | ChessRules.PawnSpecs, | |
8 | { promotions: ChessRules.PawnSpecs.promotions.concat([V.KING]) } | |
9 | ); | |
10 | } | |
11 | ||
d7c00f6a | 12 | static IsGoodPosition(position) { |
6f2f9437 | 13 | if (!ChessRules.IsGoodPosition(position)) return false; |
d7c00f6a BA |
14 | // Also check that each piece type is present |
15 | const rows = position.split("/"); | |
16 | let pieces = {}; | |
17 | for (let row of rows) { | |
18 | for (let i = 0; i < row.length; i++) { | |
19 | if (isNaN(parseInt(row[i])) && !pieces[row[i]]) | |
20 | pieces[row[i]] = true; | |
21 | } | |
22 | } | |
6f2f9437 | 23 | if (Object.keys(pieces).length != 12) return false; |
d7c00f6a BA |
24 | return true; |
25 | } | |
26 | ||
6808d7a1 | 27 | setOtherVariables(fen) { |
dac39588 BA |
28 | super.setOtherVariables(fen); |
29 | const pos = V.ParseFen(fen).position; | |
30 | // NOTE: no need for safety "|| []", because each piece type must be present | |
31 | // (otherwise game is already over!) | |
6808d7a1 BA |
32 | this.material = { |
33 | w: { | |
dac39588 BA |
34 | [V.KING]: pos.match(/K/g).length, |
35 | [V.QUEEN]: pos.match(/Q/g).length, | |
36 | [V.ROOK]: pos.match(/R/g).length, | |
37 | [V.KNIGHT]: pos.match(/N/g).length, | |
38 | [V.BISHOP]: pos.match(/B/g).length, | |
39 | [V.PAWN]: pos.match(/P/g).length | |
40 | }, | |
6808d7a1 | 41 | b: { |
dac39588 BA |
42 | [V.KING]: pos.match(/k/g).length, |
43 | [V.QUEEN]: pos.match(/q/g).length, | |
44 | [V.ROOK]: pos.match(/r/g).length, | |
45 | [V.KNIGHT]: pos.match(/n/g).length, | |
46 | [V.BISHOP]: pos.match(/b/g).length, | |
47 | [V.PAWN]: pos.match(/p/g).length | |
48 | } | |
49 | }; | |
50 | } | |
a6abf094 | 51 | |
dac39588 | 52 | // TODO: verify this assertion |
6808d7a1 | 53 | atLeastOneMove() { |
dac39588 BA |
54 | return true; //always at least one possible move |
55 | } | |
a6abf094 | 56 | |
6b7b2cf7 BA |
57 | filterValid(moves) { |
58 | return moves; //there is no check | |
dac39588 | 59 | } |
a6abf094 | 60 | |
6808d7a1 | 61 | getCheckSquares() { |
dac39588 BA |
62 | return []; |
63 | } | |
a6abf094 | 64 | |
3a2a7b5f BA |
65 | postPlay(move) { |
66 | super.postPlay(move); | |
dac39588 | 67 | // Treat the promotion case: (not the capture part) |
6808d7a1 | 68 | if (move.appear[0].p != move.vanish[0].p) { |
dac39588 BA |
69 | this.material[move.appear[0].c][move.appear[0].p]++; |
70 | this.material[move.appear[0].c][V.PAWN]--; | |
71 | } | |
6808d7a1 BA |
72 | if (move.vanish.length == 2 && move.appear.length == 1) |
73 | //capture | |
dac39588 BA |
74 | this.material[move.vanish[1].c][move.vanish[1].p]--; |
75 | } | |
a6abf094 | 76 | |
3a2a7b5f BA |
77 | postUndo(move) { |
78 | super.postUndo(move); | |
6808d7a1 | 79 | if (move.appear[0].p != move.vanish[0].p) { |
dac39588 BA |
80 | this.material[move.appear[0].c][move.appear[0].p]--; |
81 | this.material[move.appear[0].c][V.PAWN]++; | |
82 | } | |
6808d7a1 | 83 | if (move.vanish.length == 2 && move.appear.length == 1) |
dac39588 BA |
84 | this.material[move.vanish[1].c][move.vanish[1].p]++; |
85 | } | |
a6abf094 | 86 | |
6808d7a1 BA |
87 | getCurrentScore() { |
88 | if (this.atLeastOneMove()) { | |
6b7b2cf7 | 89 | // Game not over? |
dac39588 | 90 | const color = this.turn; |
6808d7a1 BA |
91 | if ( |
92 | Object.keys(this.material[color]).some(p => { | |
93 | return this.material[color][p] == 0; | |
94 | }) | |
95 | ) { | |
96 | return this.turn == "w" ? "0-1" : "1-0"; | |
dac39588 BA |
97 | } |
98 | return "*"; | |
99 | } | |
6808d7a1 | 100 | return this.turn == "w" ? "0-1" : "1-0"; //NOTE: currently unreachable... |
dac39588 | 101 | } |
a6abf094 | 102 | |
6808d7a1 | 103 | evalPosition() { |
dac39588 | 104 | const color = this.turn; |
6808d7a1 BA |
105 | if ( |
106 | Object.keys(this.material[color]).some(p => { | |
107 | return this.material[color][p] == 0; | |
108 | }) | |
109 | ) { | |
dac39588 | 110 | // Very negative (resp. positive) if white (reps. black) pieces set is incomplete |
6808d7a1 | 111 | return (color == "w" ? -1 : 1) * V.INFINITY; |
dac39588 BA |
112 | } |
113 | return super.evalPosition(); | |
114 | } | |
6808d7a1 | 115 | }; |