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0c3fe8a6 BA |
1 | import { ChessRules } from "@/base_rules"; |
2 | ||
32f6285e | 3 | export class ExtinctionRules extends ChessRules { |
7e8a7ea1 | 4 | |
32f6285e BA |
5 | static get PawnSpecs() { |
6 | return Object.assign( | |
7 | {}, | |
8 | ChessRules.PawnSpecs, | |
9 | { promotions: ChessRules.PawnSpecs.promotions.concat([V.KING]) } | |
10 | ); | |
11 | } | |
12 | ||
d7c00f6a | 13 | static IsGoodPosition(position) { |
6f2f9437 | 14 | if (!ChessRules.IsGoodPosition(position)) return false; |
d7c00f6a BA |
15 | // Also check that each piece type is present |
16 | const rows = position.split("/"); | |
17 | let pieces = {}; | |
18 | for (let row of rows) { | |
19 | for (let i = 0; i < row.length; i++) { | |
e50a8025 | 20 | if (isNaN(parseInt(row[i], 10)) && !pieces[row[i]]) |
d7c00f6a BA |
21 | pieces[row[i]] = true; |
22 | } | |
23 | } | |
6f2f9437 | 24 | if (Object.keys(pieces).length != 12) return false; |
d7c00f6a BA |
25 | return true; |
26 | } | |
27 | ||
6808d7a1 | 28 | setOtherVariables(fen) { |
dac39588 BA |
29 | super.setOtherVariables(fen); |
30 | const pos = V.ParseFen(fen).position; | |
2c5d7b20 | 31 | // NOTE: no need for safety "|| []", because each piece type is present |
dac39588 | 32 | // (otherwise game is already over!) |
6808d7a1 BA |
33 | this.material = { |
34 | w: { | |
dac39588 BA |
35 | [V.KING]: pos.match(/K/g).length, |
36 | [V.QUEEN]: pos.match(/Q/g).length, | |
37 | [V.ROOK]: pos.match(/R/g).length, | |
38 | [V.KNIGHT]: pos.match(/N/g).length, | |
39 | [V.BISHOP]: pos.match(/B/g).length, | |
40 | [V.PAWN]: pos.match(/P/g).length | |
41 | }, | |
6808d7a1 | 42 | b: { |
dac39588 BA |
43 | [V.KING]: pos.match(/k/g).length, |
44 | [V.QUEEN]: pos.match(/q/g).length, | |
45 | [V.ROOK]: pos.match(/r/g).length, | |
46 | [V.KNIGHT]: pos.match(/n/g).length, | |
47 | [V.BISHOP]: pos.match(/b/g).length, | |
48 | [V.PAWN]: pos.match(/p/g).length | |
49 | } | |
50 | }; | |
51 | } | |
a6abf094 | 52 | |
dac39588 | 53 | // TODO: verify this assertion |
6808d7a1 | 54 | atLeastOneMove() { |
dac39588 BA |
55 | return true; //always at least one possible move |
56 | } | |
a6abf094 | 57 | |
6b7b2cf7 BA |
58 | filterValid(moves) { |
59 | return moves; //there is no check | |
dac39588 | 60 | } |
a6abf094 | 61 | |
6808d7a1 | 62 | getCheckSquares() { |
dac39588 BA |
63 | return []; |
64 | } | |
a6abf094 | 65 | |
3a2a7b5f BA |
66 | postPlay(move) { |
67 | super.postPlay(move); | |
dac39588 | 68 | // Treat the promotion case: (not the capture part) |
6808d7a1 | 69 | if (move.appear[0].p != move.vanish[0].p) { |
dac39588 BA |
70 | this.material[move.appear[0].c][move.appear[0].p]++; |
71 | this.material[move.appear[0].c][V.PAWN]--; | |
72 | } | |
6808d7a1 BA |
73 | if (move.vanish.length == 2 && move.appear.length == 1) |
74 | //capture | |
dac39588 BA |
75 | this.material[move.vanish[1].c][move.vanish[1].p]--; |
76 | } | |
a6abf094 | 77 | |
3a2a7b5f BA |
78 | postUndo(move) { |
79 | super.postUndo(move); | |
6808d7a1 | 80 | if (move.appear[0].p != move.vanish[0].p) { |
dac39588 BA |
81 | this.material[move.appear[0].c][move.appear[0].p]--; |
82 | this.material[move.appear[0].c][V.PAWN]++; | |
83 | } | |
6808d7a1 | 84 | if (move.vanish.length == 2 && move.appear.length == 1) |
dac39588 BA |
85 | this.material[move.vanish[1].c][move.vanish[1].p]++; |
86 | } | |
a6abf094 | 87 | |
6808d7a1 BA |
88 | getCurrentScore() { |
89 | if (this.atLeastOneMove()) { | |
6b7b2cf7 | 90 | // Game not over? |
dac39588 | 91 | const color = this.turn; |
6808d7a1 BA |
92 | if ( |
93 | Object.keys(this.material[color]).some(p => { | |
94 | return this.material[color][p] == 0; | |
95 | }) | |
96 | ) { | |
97 | return this.turn == "w" ? "0-1" : "1-0"; | |
dac39588 BA |
98 | } |
99 | return "*"; | |
100 | } | |
6808d7a1 | 101 | return this.turn == "w" ? "0-1" : "1-0"; //NOTE: currently unreachable... |
dac39588 | 102 | } |
a6abf094 | 103 | |
6808d7a1 | 104 | evalPosition() { |
dac39588 | 105 | const color = this.turn; |
6808d7a1 BA |
106 | if ( |
107 | Object.keys(this.material[color]).some(p => { | |
108 | return this.material[color][p] == 0; | |
109 | }) | |
110 | ) { | |
2c5d7b20 BA |
111 | // Very negative (resp. positive) |
112 | // if white (reps. black) pieces set is incomplete | |
6808d7a1 | 113 | return (color == "w" ? -1 : 1) * V.INFINITY; |
dac39588 BA |
114 | } |
115 | return super.evalPosition(); | |
116 | } | |
7e8a7ea1 | 117 | |
6808d7a1 | 118 | }; |