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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 { | |
7e8a7ea1 | 5 | |
4313762d BA |
6 | static get Options() { |
7 | return { | |
8 | check: [ | |
9 | { | |
10 | label: "Random", | |
11 | defaut: false, | |
12 | variable: "random" | |
13 | } | |
14 | ], | |
15 | select: [ | |
16 | { | |
17 | label: "Number of pawns", | |
18 | variable: "pawnsCount", | |
19 | defaut: 4, | |
20 | options: [ | |
21 | { label: "Two", value: 2 }, | |
22 | { label: "Four", value: 4 }, | |
23 | { label: "Six", value: 6 } | |
24 | ] | |
25 | } | |
26 | ] | |
27 | }; | |
28 | } | |
29 | ||
30 | static AbbreviateOptions(opts) { | |
31 | return opts["pawnsCount"]; | |
32 | } | |
33 | ||
5e1bc651 BA |
34 | static IsGoodFlags(flags) { |
35 | // Only black can castle | |
36 | return !!flags.match(/^[a-z]{2,2}$/); | |
37 | } | |
38 | ||
4313762d BA |
39 | static GenRandInitFen(options) { |
40 | const baseFen = ChessRules.GenRandInitFen( | |
41 | { randomness: (options.random ? 1 : 0) }); | |
42 | let pawnsLine = ""; | |
43 | switch (options.pawnsCount) { | |
44 | case 2: pawnsLine = "3PP3"; break; | |
45 | case 4: pawnsLine = "2PPPP2"; break; | |
46 | case 6: pawnsLine = "1PPPPPP1"; break; | |
47 | } | |
5e1bc651 BA |
48 | return ( |
49 | // 26 first chars are 6 rows + 6 slashes | |
4313762d | 50 | baseFen.substr(0, 26) + pawnsLine + "/4K3 w 0 " + |
5e1bc651 | 51 | // En passant available, and "half-castle" |
4313762d | 52 | baseFen.substr(-6, 2) + " -" |
5e1bc651 BA |
53 | ); |
54 | } | |
55 | ||
56 | getFlagsFen() { | |
57 | return this.castleFlags['b'].map(V.CoordToColumn).join(""); | |
58 | } | |
59 | ||
60 | setFlags(fenflags) { | |
61 | this.castleFlags = { 'b': [-1, -1] }; | |
62 | for (let i = 0; i < 2; i++) | |
63 | this.castleFlags['b'][i] = V.ColumnToCoord(fenflags.charAt(i)); | |
64 | } | |
65 | ||
66 | setOtherVariables(fen) { | |
67 | super.setOtherVariables(fen); | |
68 | this.subTurn = 1; | |
69 | } | |
70 | ||
71 | getPotentialKingMoves([x, y]) { | |
72 | if (this.getColor(x, y) == 'b') return super.getPotentialKingMoves([x, y]); | |
73 | // White doesn't castle: | |
74 | return this.getSlideNJumpMoves( | |
4313762d | 75 | [x, y], V.steps[V.ROOK].concat(V.steps[V.BISHOP]), 1); |
5e1bc651 BA |
76 | } |
77 | ||
34bfe151 | 78 | isAttacked() { |
bc0b9205 | 79 | // Goal is king capture => no checks |
5e1bc651 BA |
80 | return false; |
81 | } | |
82 | ||
bc0b9205 BA |
83 | filterValid(moves) { |
84 | return moves; | |
85 | } | |
86 | ||
87 | getCheckSquares() { | |
88 | return []; | |
89 | } | |
90 | ||
91 | getCurrentScore() { | |
92 | const color = this.turn; | |
93 | if (this.kingPos[color][0] < 0) return (color == 'w' ? "0-1" : "1-0"); | |
94 | return "*"; | |
95 | } | |
96 | ||
5e1bc651 BA |
97 | play(move) { |
98 | move.flags = JSON.stringify(this.aggregateFlags()); | |
99 | if (this.turn == 'b' || this.subTurn == 2) | |
100 | this.epSquares.push(this.getEpSquare(move)); | |
101 | else this.epSquares.push(null); | |
102 | V.PlayOnBoard(this.board, move); | |
103 | if (this.turn == 'w') { | |
104 | if (this.subTurn == 1) this.movesCount++; | |
964eda04 BA |
105 | if ( |
106 | this.subTurn == 2 || | |
107 | // King captured | |
108 | (move.vanish.length == 2 && move.vanish[1].p == V.KING) | |
109 | ) { | |
110 | this.turn = 'b'; | |
111 | this.subTurn = 1; | |
112 | } | |
113 | else this.subTurn = 2; | |
114 | } | |
115 | else { | |
5e1bc651 BA |
116 | this.turn = 'w'; |
117 | this.movesCount++; | |
118 | } | |
119 | this.postPlay(move); | |
120 | } | |
121 | ||
122 | updateCastleFlags(move, piece) { | |
123 | // Only black can castle: | |
124 | const firstRank = 0; | |
125 | if (piece == V.KING && move.appear[0].c == 'b') | |
126 | this.castleFlags['b'] = [8, 8]; | |
127 | else if ( | |
128 | move.start.x == firstRank && | |
129 | this.castleFlags['b'].includes(move.start.y) | |
130 | ) { | |
131 | const flagIdx = (move.start.y == this.castleFlags['b'][0] ? 0 : 1); | |
132 | this.castleFlags['b'][flagIdx] = 8; | |
133 | } | |
134 | else if ( | |
135 | move.end.x == firstRank && | |
136 | this.castleFlags['b'].includes(move.end.y) | |
137 | ) { | |
138 | const flagIdx = (move.end.y == this.castleFlags['b'][0] ? 0 : 1); | |
139 | this.castleFlags['b'][flagIdx] = 8; | |
140 | } | |
141 | } | |
142 | ||
143 | postPlay(move) { | |
144 | // Definition of 'c' in base class doesn't work: | |
145 | const c = move.vanish[0].c; | |
146 | const piece = move.vanish[0].p; | |
bc0b9205 BA |
147 | if (piece == V.KING) |
148 | this.kingPos[c] = [move.appear[0].x, move.appear[0].y]; | |
964eda04 | 149 | if (move.vanish.length == 2 && move.vanish[1].p == V.KING) { |
bc0b9205 BA |
150 | // Opponent's king is captured, game over |
151 | this.kingPos[move.vanish[1].c] = [-1, -1]; | |
964eda04 BA |
152 | move.captureKing = true; //for undo |
153 | } | |
5e1bc651 BA |
154 | this.updateCastleFlags(move, piece); |
155 | } | |
156 | ||
157 | undo(move) { | |
158 | this.epSquares.pop(); | |
159 | this.disaggregateFlags(JSON.parse(move.flags)); | |
160 | V.UndoOnBoard(this.board, move); | |
161 | if (this.turn == 'w') { | |
162 | if (this.subTurn == 2) this.subTurn = 1; | |
163 | else this.turn = 'b'; | |
164 | this.movesCount--; | |
bc0b9205 BA |
165 | } |
166 | else { | |
5e1bc651 | 167 | this.turn = 'w'; |
964eda04 | 168 | this.subTurn = (!move.captureKing ? 2 : 1); |
5e1bc651 BA |
169 | } |
170 | this.postUndo(move); | |
171 | } | |
172 | ||
bc0b9205 BA |
173 | postUndo(move) { |
174 | if (move.vanish.length == 2 && move.vanish[1].p == V.KING) | |
175 | // Opponent's king was captured | |
176 | this.kingPos[move.vanish[1].c] = [move.vanish[1].x, move.vanish[1].y]; | |
177 | super.postUndo(move); | |
5e1bc651 BA |
178 | } |
179 | ||
bc0b9205 | 180 | // Custom search at depth 1(+1) |
5e1bc651 | 181 | getComputerMove() { |
bc0b9205 | 182 | const getBestWhiteMove = (terminal) => { |
5e1bc651 | 183 | // Generate all sequences of 2-moves |
bc0b9205 | 184 | let moves1 = this.getAllValidMoves(); |
5e1bc651 BA |
185 | moves1.forEach(m1 => { |
186 | m1.eval = -V.INFINITY; | |
187 | m1.move2 = null; | |
188 | this.play(m1); | |
bc0b9205 BA |
189 | if (!!terminal) m1.eval = this.evalPosition(); |
190 | else { | |
191 | const moves2 = this.getAllValidMoves(); | |
192 | moves2.forEach(m2 => { | |
193 | this.play(m2); | |
194 | const eval2 = this.evalPosition() + 0.05 - Math.random() / 10; | |
195 | this.undo(m2); | |
196 | if (eval2 > m1.eval) { | |
197 | m1.eval = eval2; | |
198 | m1.move2 = m2; | |
199 | } | |
200 | }); | |
201 | } | |
5e1bc651 BA |
202 | this.undo(m1); |
203 | }); | |
204 | moves1.sort((a, b) => b.eval - a.eval); | |
bc0b9205 BA |
205 | if (!!terminal) |
206 | // The move itself doesn't matter, only its eval: | |
207 | return moves1[0]; | |
5e1bc651 BA |
208 | let candidates = [0]; |
209 | for ( | |
210 | let i = 1; | |
211 | i < moves1.length && moves1[i].eval == moves1[0].eval; | |
212 | i++ | |
213 | ) { | |
214 | candidates.push(i); | |
215 | } | |
216 | const idx = candidates[randInt(candidates.length)]; | |
217 | const move2 = moves1[idx].move2; | |
218 | delete moves1[idx]["move2"]; | |
219 | return [moves1[idx], move2]; | |
bc0b9205 BA |
220 | }; |
221 | ||
222 | const getBestBlackMove = () => { | |
223 | let moves = this.getAllValidMoves(); | |
224 | moves.forEach(m => { | |
225 | m.eval = V.INFINITY; | |
226 | this.play(m); | |
227 | const evalM = getBestWhiteMove("terminal").eval | |
228 | this.undo(m); | |
229 | if (evalM < m.eval) m.eval = evalM; | |
230 | }); | |
231 | moves.sort((a, b) => a.eval - b.eval); | |
232 | let candidates = [0]; | |
233 | for ( | |
234 | let i = 1; | |
235 | i < moves.length && moves[i].eval == moves[0].eval; | |
236 | i++ | |
237 | ) { | |
238 | candidates.push(i); | |
239 | } | |
240 | const idx = candidates[randInt(candidates.length)]; | |
241 | return moves[idx]; | |
242 | }; | |
243 | ||
244 | const color = this.turn; | |
245 | return (color == 'w' ? getBestWhiteMove() : getBestBlackMove()); | |
5e1bc651 | 246 | } |
7e8a7ea1 | 247 | |
5e1bc651 | 248 | }; |