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5e1bc651 BA |
1 | import { ChessRules } from "@/base_rules"; |
2 | import { randInt } from "@/utils/alea"; | |
3 | ||
4 | export class MonsterRules extends ChessRules { | |
5 | static IsGoodFlags(flags) { | |
6 | // Only black can castle | |
7 | return !!flags.match(/^[a-z]{2,2}$/); | |
8 | } | |
9 | ||
10 | static GenRandInitFen(randomness) { | |
11 | if (randomness == 2) randomness--; | |
12 | const fen = ChessRules.GenRandInitFen(randomness); | |
13 | return ( | |
14 | // 26 first chars are 6 rows + 6 slashes | |
15 | fen.substr(0, 26) | |
16 | // En passant available, and "half-castle" | |
dd3ec662 | 17 | .concat("1PPPPPP1/4K3 w 0 ") |
5e1bc651 BA |
18 | .concat(fen.substr(-6, 2)) |
19 | .concat(" -") | |
20 | ); | |
21 | } | |
22 | ||
23 | getFlagsFen() { | |
24 | return this.castleFlags['b'].map(V.CoordToColumn).join(""); | |
25 | } | |
26 | ||
27 | setFlags(fenflags) { | |
28 | this.castleFlags = { 'b': [-1, -1] }; | |
29 | for (let i = 0; i < 2; i++) | |
30 | this.castleFlags['b'][i] = V.ColumnToCoord(fenflags.charAt(i)); | |
31 | } | |
32 | ||
33 | setOtherVariables(fen) { | |
34 | super.setOtherVariables(fen); | |
35 | this.subTurn = 1; | |
36 | } | |
37 | ||
38 | getPotentialKingMoves([x, y]) { | |
39 | if (this.getColor(x, y) == 'b') return super.getPotentialKingMoves([x, y]); | |
40 | // White doesn't castle: | |
41 | return this.getSlideNJumpMoves( | |
42 | [x, y], | |
43 | V.steps[V.ROOK].concat(V.steps[V.BISHOP]), | |
44 | "oneStep" | |
45 | ); | |
46 | } | |
47 | ||
34bfe151 | 48 | isAttacked() { |
bc0b9205 | 49 | // Goal is king capture => no checks |
5e1bc651 BA |
50 | return false; |
51 | } | |
52 | ||
bc0b9205 BA |
53 | filterValid(moves) { |
54 | return moves; | |
55 | } | |
56 | ||
57 | getCheckSquares() { | |
58 | return []; | |
59 | } | |
60 | ||
61 | getCurrentScore() { | |
62 | const color = this.turn; | |
63 | if (this.kingPos[color][0] < 0) return (color == 'w' ? "0-1" : "1-0"); | |
64 | return "*"; | |
65 | } | |
66 | ||
5e1bc651 BA |
67 | play(move) { |
68 | move.flags = JSON.stringify(this.aggregateFlags()); | |
69 | if (this.turn == 'b' || this.subTurn == 2) | |
70 | this.epSquares.push(this.getEpSquare(move)); | |
71 | else this.epSquares.push(null); | |
72 | V.PlayOnBoard(this.board, move); | |
73 | if (this.turn == 'w') { | |
74 | if (this.subTurn == 1) this.movesCount++; | |
75 | else this.turn = 'b'; | |
76 | this.subTurn = 3 - this.subTurn; | |
77 | } else { | |
78 | this.turn = 'w'; | |
79 | this.movesCount++; | |
80 | } | |
81 | this.postPlay(move); | |
82 | } | |
83 | ||
84 | updateCastleFlags(move, piece) { | |
85 | // Only black can castle: | |
86 | const firstRank = 0; | |
87 | if (piece == V.KING && move.appear[0].c == 'b') | |
88 | this.castleFlags['b'] = [8, 8]; | |
89 | else if ( | |
90 | move.start.x == firstRank && | |
91 | this.castleFlags['b'].includes(move.start.y) | |
92 | ) { | |
93 | const flagIdx = (move.start.y == this.castleFlags['b'][0] ? 0 : 1); | |
94 | this.castleFlags['b'][flagIdx] = 8; | |
95 | } | |
96 | else if ( | |
97 | move.end.x == firstRank && | |
98 | this.castleFlags['b'].includes(move.end.y) | |
99 | ) { | |
100 | const flagIdx = (move.end.y == this.castleFlags['b'][0] ? 0 : 1); | |
101 | this.castleFlags['b'][flagIdx] = 8; | |
102 | } | |
103 | } | |
104 | ||
105 | postPlay(move) { | |
106 | // Definition of 'c' in base class doesn't work: | |
107 | const c = move.vanish[0].c; | |
108 | const piece = move.vanish[0].p; | |
bc0b9205 BA |
109 | if (piece == V.KING) |
110 | this.kingPos[c] = [move.appear[0].x, move.appear[0].y]; | |
111 | if (move.vanish.length == 2 && move.vanish[1].p == V.KING) | |
112 | // Opponent's king is captured, game over | |
113 | this.kingPos[move.vanish[1].c] = [-1, -1]; | |
5e1bc651 BA |
114 | this.updateCastleFlags(move, piece); |
115 | } | |
116 | ||
117 | undo(move) { | |
118 | this.epSquares.pop(); | |
119 | this.disaggregateFlags(JSON.parse(move.flags)); | |
120 | V.UndoOnBoard(this.board, move); | |
121 | if (this.turn == 'w') { | |
122 | if (this.subTurn == 2) this.subTurn = 1; | |
123 | else this.turn = 'b'; | |
124 | this.movesCount--; | |
bc0b9205 BA |
125 | } |
126 | else { | |
5e1bc651 BA |
127 | this.turn = 'w'; |
128 | this.subTurn = 2; | |
129 | } | |
130 | this.postUndo(move); | |
131 | } | |
132 | ||
bc0b9205 BA |
133 | postUndo(move) { |
134 | if (move.vanish.length == 2 && move.vanish[1].p == V.KING) | |
135 | // Opponent's king was captured | |
136 | this.kingPos[move.vanish[1].c] = [move.vanish[1].x, move.vanish[1].y]; | |
137 | super.postUndo(move); | |
5e1bc651 BA |
138 | } |
139 | ||
bc0b9205 | 140 | // Custom search at depth 1(+1) |
5e1bc651 | 141 | getComputerMove() { |
bc0b9205 | 142 | const getBestWhiteMove = (terminal) => { |
5e1bc651 | 143 | // Generate all sequences of 2-moves |
bc0b9205 | 144 | let moves1 = this.getAllValidMoves(); |
5e1bc651 BA |
145 | moves1.forEach(m1 => { |
146 | m1.eval = -V.INFINITY; | |
147 | m1.move2 = null; | |
148 | this.play(m1); | |
bc0b9205 BA |
149 | if (!!terminal) m1.eval = this.evalPosition(); |
150 | else { | |
151 | const moves2 = this.getAllValidMoves(); | |
152 | moves2.forEach(m2 => { | |
153 | this.play(m2); | |
154 | const eval2 = this.evalPosition() + 0.05 - Math.random() / 10; | |
155 | this.undo(m2); | |
156 | if (eval2 > m1.eval) { | |
157 | m1.eval = eval2; | |
158 | m1.move2 = m2; | |
159 | } | |
160 | }); | |
161 | } | |
5e1bc651 BA |
162 | this.undo(m1); |
163 | }); | |
164 | moves1.sort((a, b) => b.eval - a.eval); | |
bc0b9205 BA |
165 | if (!!terminal) |
166 | // The move itself doesn't matter, only its eval: | |
167 | return moves1[0]; | |
5e1bc651 BA |
168 | let candidates = [0]; |
169 | for ( | |
170 | let i = 1; | |
171 | i < moves1.length && moves1[i].eval == moves1[0].eval; | |
172 | i++ | |
173 | ) { | |
174 | candidates.push(i); | |
175 | } | |
176 | const idx = candidates[randInt(candidates.length)]; | |
177 | const move2 = moves1[idx].move2; | |
178 | delete moves1[idx]["move2"]; | |
179 | return [moves1[idx], move2]; | |
bc0b9205 BA |
180 | }; |
181 | ||
182 | const getBestBlackMove = () => { | |
183 | let moves = this.getAllValidMoves(); | |
184 | moves.forEach(m => { | |
185 | m.eval = V.INFINITY; | |
186 | this.play(m); | |
187 | const evalM = getBestWhiteMove("terminal").eval | |
188 | this.undo(m); | |
189 | if (evalM < m.eval) m.eval = evalM; | |
190 | }); | |
191 | moves.sort((a, b) => a.eval - b.eval); | |
192 | let candidates = [0]; | |
193 | for ( | |
194 | let i = 1; | |
195 | i < moves.length && moves[i].eval == moves[0].eval; | |
196 | i++ | |
197 | ) { | |
198 | candidates.push(i); | |
199 | } | |
200 | const idx = candidates[randInt(candidates.length)]; | |
201 | return moves[idx]; | |
202 | }; | |
203 | ||
204 | const color = this.turn; | |
205 | return (color == 'w' ? getBestWhiteMove() : getBestBlackMove()); | |
5e1bc651 BA |
206 | } |
207 | }; |