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1a3cfdc0 BA |
1 | import { ChessRules } from "@/base_rules"; |
2 | import { randInt } from "@/utils/alea"; | |
3 | ||
4 | export class ApocalypseRules extends ChessRules { | |
5 | static get PawnSpecs() { | |
6 | return Object.assign( | |
7 | {}, | |
8 | ChessRules.PawnSpecs, | |
9 | { | |
10 | twoSquares: false, | |
11 | promotions: [V.KNIGHT] | |
12 | } | |
13 | ); | |
14 | } | |
15 | ||
00eef1ca BA |
16 | static get SomeHiddenMoves() { |
17 | return true; | |
18 | } | |
19 | ||
1a3cfdc0 BA |
20 | static get HasCastle() { |
21 | return false; | |
22 | } | |
23 | ||
24 | static get HasEnpassant() { | |
25 | return false; | |
26 | } | |
27 | ||
28 | static get CanAnalyze() { | |
70d47c1d | 29 | return false; |
1a3cfdc0 BA |
30 | } |
31 | ||
32 | static get ShowMoves() { | |
33 | return "byrow"; | |
34 | } | |
35 | ||
6ec2feb2 BA |
36 | getPPpath(m) { |
37 | // Show the piece taken, if any, and not multiple pawns: | |
38 | if (m.vanish.length == 1) return "Apocalypse/empty"; | |
39 | return m.vanish[1].c + m.vanish[1].p; | |
40 | } | |
41 | ||
1a3cfdc0 BA |
42 | static get PIECES() { |
43 | return [V.PAWN, V.KNIGHT]; | |
44 | } | |
45 | ||
46 | static IsGoodPosition(position) { | |
47 | if (position.length == 0) return false; | |
48 | const rows = position.split("/"); | |
49 | if (rows.length != V.size.x) return false; | |
50 | // At least one pawn per color | |
51 | let pawns = { "p": 0, "P": 0 }; | |
52 | for (let row of rows) { | |
53 | let sumElts = 0; | |
54 | for (let i = 0; i < row.length; i++) { | |
55 | if (['P','p'].includes(row[i])) pawns[row[i]]++; | |
56 | if (V.PIECES.includes(row[i].toLowerCase())) sumElts++; | |
57 | else { | |
e50a8025 | 58 | const num = parseInt(row[i], 10); |
1a3cfdc0 BA |
59 | if (isNaN(num)) return false; |
60 | sumElts += num; | |
61 | } | |
62 | } | |
63 | if (sumElts != V.size.y) return false; | |
64 | } | |
65 | if (Object.values(pawns).some(v => v == 0)) | |
66 | return false; | |
67 | return true; | |
68 | } | |
69 | ||
70 | static IsGoodFen(fen) { | |
71 | if (!ChessRules.IsGoodFen(fen)) return false; | |
72 | const fenParsed = V.ParseFen(fen); | |
73 | // 4) Check whiteMove | |
74 | if ( | |
75 | ( | |
9edfb714 | 76 | fenParsed.turn == "b" && |
1a3cfdc0 BA |
77 | // NOTE: do not check really JSON stringified move... |
78 | (!fenParsed.whiteMove || fenParsed.whiteMove == "-") | |
79 | ) | |
80 | || | |
9edfb714 | 81 | (fenParsed.turn == "w" && fenParsed.whiteMove != "-") |
1a3cfdc0 BA |
82 | ) { |
83 | return false; | |
84 | } | |
85 | return true; | |
86 | } | |
87 | ||
88 | static IsGoodFlags(flags) { | |
89 | return !!flags.match(/^[0-2]{2,2}$/); | |
90 | } | |
91 | ||
92 | aggregateFlags() { | |
93 | return this.penaltyFlags; | |
94 | } | |
95 | ||
96 | disaggregateFlags(flags) { | |
97 | this.penaltyFlags = flags; | |
98 | } | |
99 | ||
100 | static ParseFen(fen) { | |
101 | const fenParts = fen.split(" "); | |
102 | return Object.assign( | |
103 | ChessRules.ParseFen(fen), | |
104 | { whiteMove: fenParts[4] } | |
105 | ); | |
106 | } | |
107 | ||
108 | static get size() { | |
109 | return { x: 5, y: 5 }; | |
110 | } | |
111 | ||
112 | static GenRandInitFen() { | |
113 | return "npppn/p3p/5/P3P/NPPPN w 0 00 -"; | |
114 | } | |
115 | ||
116 | getFen() { | |
117 | return super.getFen() + " " + this.getWhitemoveFen(); | |
118 | } | |
119 | ||
120 | getFenForRepeat() { | |
121 | return super.getFenForRepeat() + "_" + this.getWhitemoveFen(); | |
122 | } | |
123 | ||
124 | getFlagsFen() { | |
6ec2feb2 BA |
125 | return ( |
126 | this.penaltyFlags['w'].toString() + this.penaltyFlags['b'].toString() | |
127 | ); | |
1a3cfdc0 BA |
128 | } |
129 | ||
130 | setOtherVariables(fen) { | |
131 | const parsedFen = V.ParseFen(fen); | |
132 | this.setFlags(parsedFen.flags); | |
133 | // Also init whiteMove | |
134 | this.whiteMove = | |
135 | parsedFen.whiteMove != "-" | |
136 | ? JSON.parse(parsedFen.whiteMove) | |
137 | : null; | |
138 | } | |
139 | ||
140 | setFlags(fenflags) { | |
6ec2feb2 | 141 | this.penaltyFlags = { |
e50a8025 BA |
142 | 'w': parseInt(fenflags[0], 10), |
143 | 'b': parseInt(fenflags[1], 10) | |
6ec2feb2 | 144 | }; |
1a3cfdc0 BA |
145 | } |
146 | ||
147 | getWhitemoveFen() { | |
148 | if (!this.whiteMove) return "-"; | |
149 | return JSON.stringify({ | |
150 | start: this.whiteMove.start, | |
151 | end: this.whiteMove.end, | |
152 | appear: this.whiteMove.appear, | |
6e0f2842 | 153 | vanish: this.whiteMove.vanish |
1a3cfdc0 BA |
154 | }); |
155 | } | |
156 | ||
157 | getSpeculations(moves, sq) { | |
158 | let moveSet = {}; | |
159 | moves.forEach(m => { | |
160 | const mHash = "m" + m.start.x + m.start.y + m.end.x + m.end.y; | |
161 | moveSet[mHash] = true; | |
162 | }); | |
163 | const color = this.turn; | |
164 | this.turn = V.GetOppCol(color); | |
165 | const oppMoves = super.getAllValidMoves(); | |
166 | this.turn = color; | |
6ec2feb2 | 167 | // For each opponent's move, generate valid moves [from sq if same color] |
1a3cfdc0 BA |
168 | let speculations = []; |
169 | oppMoves.forEach(m => { | |
170 | V.PlayOnBoard(this.board, m); | |
171 | const newValidMoves = | |
172 | !!sq | |
6ec2feb2 BA |
173 | ? ( |
174 | this.getColor(sq[0], sq[1]) == color | |
175 | ? super.getPotentialMovesFrom(sq) | |
176 | : [] | |
177 | ) | |
1a3cfdc0 BA |
178 | : super.getAllValidMoves(); |
179 | newValidMoves.forEach(vm => { | |
180 | const mHash = "m" + vm.start.x + vm.start.y + vm.end.x + vm.end.y; | |
181 | if (!moveSet[mHash]) { | |
182 | moveSet[mHash] = true; | |
6e0f2842 | 183 | vm.end.illegal = true; //potentially illegal! |
1a3cfdc0 BA |
184 | speculations.push(vm); |
185 | } | |
186 | }); | |
187 | V.UndoOnBoard(this.board, m); | |
188 | }); | |
189 | return speculations; | |
190 | } | |
191 | ||
192 | getPossibleMovesFrom([x, y]) { | |
193 | const possibleMoves = super.getPotentialMovesFrom([x, y]) | |
194 | // Augment potential moves with opponent's moves speculation: | |
195 | return possibleMoves.concat(this.getSpeculations(possibleMoves, [x, y])); | |
196 | } | |
197 | ||
198 | getAllValidMoves() { | |
199 | // Return possible moves + potentially valid moves | |
200 | const validMoves = super.getAllValidMoves(); | |
201 | return validMoves.concat(this.getSpeculations(validMoves)); | |
202 | } | |
203 | ||
204 | addPawnMoves([x1, y1], [x2, y2], moves) { | |
205 | let finalPieces = [V.PAWN]; | |
206 | const color = this.turn; | |
207 | const lastRank = (color == "w" ? 0 : V.size.x - 1); | |
208 | if (x2 == lastRank) { | |
209 | // If 0 or 1 horsemen, promote in knight | |
210 | let knightCounter = 0; | |
211 | let emptySquares = []; | |
6ec2feb2 BA |
212 | for (let i = 0; i < V.size.x; i++) { |
213 | for (let j = 0; j < V.size.y; j++) { | |
1a3cfdc0 BA |
214 | if (this.board[i][j] == V.EMPTY) emptySquares.push([i, j]); |
215 | else if ( | |
216 | this.getColor(i, j) == color && | |
217 | this.getPiece(i, j) == V.KNIGHT | |
218 | ) { | |
219 | knightCounter++; | |
220 | } | |
221 | } | |
222 | } | |
223 | if (knightCounter <= 1) finalPieces = [V.KNIGHT]; | |
224 | else { | |
6ec2feb2 BA |
225 | // Generate all possible landings, maybe capturing something on the way |
226 | let capture = undefined; | |
227 | if (this.board[x2][y2] != V.EMPTY) { | |
228 | capture = JSON.parse(JSON.stringify({ | |
229 | x: x2, | |
230 | y: y2, | |
231 | c: this.getColor(x2, y2), | |
232 | p: this.getPiece(x2, y2) | |
233 | })); | |
234 | } | |
1a3cfdc0 | 235 | emptySquares.forEach(sq => { |
6ec2feb2 BA |
236 | if (sq[0] != lastRank) { |
237 | let newMove = this.getBasicMove([x1, y1], [sq[0], sq[1]]); | |
238 | if (!!capture) newMove.vanish.push(capture); | |
239 | moves.push(newMove); | |
240 | } | |
1a3cfdc0 BA |
241 | }); |
242 | return; | |
243 | } | |
244 | } | |
245 | let tr = null; | |
246 | for (let piece of finalPieces) { | |
247 | tr = (piece != V.PAWN ? { c: color, p: piece } : null); | |
248 | moves.push(this.getBasicMove([x1, y1], [x2, y2], tr)); | |
249 | } | |
250 | } | |
251 | ||
252 | filterValid(moves) { | |
253 | // No checks: | |
254 | return moves; | |
255 | } | |
256 | ||
257 | atLeastOneMove(color) { | |
258 | const curTurn = this.turn; | |
259 | this.turn = color; | |
260 | const res = super.atLeastOneMove(); | |
261 | this.turn = curTurn; | |
262 | return res; | |
263 | } | |
264 | ||
265 | // White and black (partial) moves were played: merge | |
266 | resolveSynchroneMove(move) { | |
6ec2feb2 BA |
267 | let m1 = this.whiteMove; |
268 | let m2 = move; | |
269 | const movingLikeCapture = (m) => { | |
270 | const shift = (m.vanish[0].c == 'w' ? -1 : 1); | |
271 | return ( | |
272 | m.start.x + shift == m.end.x && | |
273 | Math.abs(m.end.y - m.start.y) == 1 | |
274 | ); | |
275 | }; | |
276 | const isPossible = (m, other) => { | |
277 | return ( | |
278 | ( | |
279 | m.vanish[0].p == V.KNIGHT && | |
b866a62a BA |
280 | ( |
281 | m.vanish.length == 1 || | |
282 | m.vanish[1].c != m.vanish[0].c || | |
283 | // Self-capture attempt | |
284 | ( | |
6e0f2842 | 285 | !other.end.illegal && |
b866a62a BA |
286 | other.end.x == m.end.x && |
287 | other.end.y == m.end.y | |
288 | ) | |
289 | ) | |
6ec2feb2 BA |
290 | ) |
291 | || | |
292 | ( | |
b866a62a | 293 | m.vanish[0].p == V.PAWN && |
6e0f2842 | 294 | !other.end.illegal && |
b866a62a BA |
295 | ( |
296 | ( | |
297 | // Promotion attempt | |
298 | m.end.x == (m.vanish[0].c == "w" ? 0 : V.size.x - 1) && | |
299 | other.vanish.length == 2 && | |
300 | other.vanish[1].p == V.KNIGHT && | |
301 | other.vanish[1].c == m.vanish[0].c | |
302 | ) | |
303 | || | |
304 | ( | |
305 | // Moving attempt | |
306 | !movingLikeCapture(m) && | |
307 | other.start.x == m.end.x && | |
308 | other.start.y == m.end.y | |
309 | ) | |
310 | || | |
311 | ( | |
312 | // Capture attempt | |
313 | movingLikeCapture(m) && | |
314 | other.end.x == m.end.x && | |
315 | other.end.y == m.end.y | |
316 | ) | |
317 | ) | |
6ec2feb2 BA |
318 | ) |
319 | ); | |
320 | }; | |
6e0f2842 | 321 | if (!!m1.end.illegal && !isPossible(m1, m2)) { |
6ec2feb2 BA |
322 | // Either an anticipated capture of something which didn't move |
323 | // (or not to the right square), or a push through blocus. | |
324 | // ==> Just discard the move, and add a penalty point | |
325 | this.penaltyFlags[m1.vanish[0].c]++; | |
326 | m1.isNull = true; | |
1a3cfdc0 | 327 | } |
6e0f2842 | 328 | if (!!m2.end.illegal && !isPossible(m2, m1)) { |
6ec2feb2 BA |
329 | this.penaltyFlags[m2.vanish[0].c]++; |
330 | m2.isNull = true; | |
331 | } | |
332 | if (!!m1.isNull) m1 = null; | |
333 | if (!!m2.isNull) m2 = null; | |
334 | // If one move is illegal, just execute the other | |
335 | if (!m1 && !!m2) return m2; | |
336 | if (!m2 && !!m1) return m1; | |
1a3cfdc0 BA |
337 | // For PlayOnBoard (no need for start / end, irrelevant) |
338 | let smove = { | |
339 | appear: [], | |
340 | vanish: [] | |
341 | }; | |
1a3cfdc0 | 342 | if (!m1 && !m2) return smove; |
54f51146 | 343 | // Both moves are now legal or at least possible: |
1a3cfdc0 BA |
344 | smove.vanish.push(m1.vanish[0]); |
345 | smove.vanish.push(m2.vanish[0]); | |
346 | if ((m1.end.x != m2.end.x) || (m1.end.y != m2.end.y)) { | |
347 | // Easy case: two independant moves | |
348 | smove.appear.push(m1.appear[0]); | |
349 | smove.appear.push(m2.appear[0]); | |
350 | // "Captured" pieces may have moved: | |
351 | if ( | |
352 | m1.vanish.length == 2 && | |
353 | ( | |
354 | m1.vanish[1].x != m2.start.x || | |
355 | m1.vanish[1].y != m2.start.y | |
356 | ) | |
357 | ) { | |
358 | smove.vanish.push(m1.vanish[1]); | |
359 | } | |
360 | if ( | |
361 | m2.vanish.length == 2 && | |
362 | ( | |
363 | m2.vanish[1].x != m1.start.x || | |
364 | m2.vanish[1].y != m1.start.y | |
365 | ) | |
366 | ) { | |
367 | smove.vanish.push(m2.vanish[1]); | |
368 | } | |
369 | } else { | |
6ec2feb2 BA |
370 | // Collision: priority to the anticipated capture, if any. |
371 | // If ex-aequo: knight wins (higher risk), or both disappears. | |
372 | // Then, priority to the knight vs pawn: remains. | |
373 | // Finally: both disappears. | |
374 | let remain = null; | |
1a3cfdc0 BA |
375 | const p1 = m1.vanish[0].p; |
376 | const p2 = m2.vanish[0].p; | |
6e0f2842 BA |
377 | if (!!m1.end.illegal && !m2.end.illegal) remain = { c: 'w', p: p1 }; |
378 | else if (!!m2.end.illegal && !m1.end.illegal) remain = { c: 'b', p: p2 }; | |
6ec2feb2 BA |
379 | if (!remain) { |
380 | // Either both are illegal or both are legal | |
381 | if (p1 == V.KNIGHT && p2 == V.PAWN) remain = { c: 'w', p: p1 }; | |
382 | else if (p2 == V.KNIGHT && p1 == V.PAWN) remain = { c: 'b', p: p2 }; | |
383 | // If remain is still null: same type same risk, both disappear | |
384 | } | |
385 | if (!!remain) { | |
1a3cfdc0 BA |
386 | smove.appear.push({ |
387 | x: m1.end.x, | |
388 | y: m1.end.y, | |
6ec2feb2 BA |
389 | p: remain.p, |
390 | c: remain.c | |
1a3cfdc0 BA |
391 | }); |
392 | } | |
393 | } | |
394 | return smove; | |
395 | } | |
396 | ||
397 | play(move) { | |
398 | // Do not play on board (would reveal the move...) | |
399 | move.flags = JSON.stringify(this.aggregateFlags()); | |
400 | this.turn = V.GetOppCol(this.turn); | |
401 | this.movesCount++; | |
402 | this.postPlay(move); | |
403 | } | |
404 | ||
405 | postPlay(move) { | |
406 | if (this.turn == 'b') { | |
407 | // NOTE: whiteMove is used read-only, so no need to copy | |
408 | this.whiteMove = move; | |
409 | return; | |
410 | } | |
1a3cfdc0 BA |
411 | // A full turn just ended: |
412 | const smove = this.resolveSynchroneMove(move); | |
413 | V.PlayOnBoard(this.board, smove); | |
414 | move.whiteMove = this.whiteMove; //for undo | |
415 | this.whiteMove = null; | |
416 | move.smove = smove; | |
417 | } | |
418 | ||
419 | undo(move) { | |
420 | this.disaggregateFlags(JSON.parse(move.flags)); | |
421 | if (this.turn == 'w') | |
422 | // Back to the middle of the move | |
423 | V.UndoOnBoard(this.board, move.smove); | |
424 | this.turn = V.GetOppCol(this.turn); | |
425 | this.movesCount--; | |
426 | this.postUndo(move); | |
427 | } | |
428 | ||
429 | postUndo(move) { | |
430 | if (this.turn == 'w') this.whiteMove = null; | |
431 | else this.whiteMove = move.whiteMove; | |
432 | } | |
433 | ||
af34341d | 434 | getCheckSquares() { |
1a3cfdc0 BA |
435 | return []; |
436 | } | |
437 | ||
438 | getCurrentScore() { | |
439 | if (this.turn == 'b') | |
440 | // Turn (white + black) not over yet | |
441 | return "*"; | |
442 | // Count footmen: if a side has none, it loses | |
443 | let fmCount = { 'w': 0, 'b': 0 }; | |
444 | for (let i=0; i<5; i++) { | |
445 | for (let j=0; j<5; j++) { | |
446 | if (this.board[i][j] != V.EMPTY && this.getPiece(i, j) == V.PAWN) | |
447 | fmCount[this.getColor(i, j)]++; | |
448 | } | |
449 | } | |
450 | if (Object.values(fmCount).some(v => v == 0)) { | |
451 | if (fmCount['w'] == 0 && fmCount['b'] == 0) | |
452 | // Everyone died | |
453 | return "1/2"; | |
454 | if (fmCount['w'] == 0) return "0-1"; | |
455 | return "1-0"; //fmCount['b'] == 0 | |
456 | } | |
457 | // Check penaltyFlags: if a side has 2 or more, it loses | |
6ec2feb2 BA |
458 | if (Object.values(this.penaltyFlags).every(v => v == 2)) return "1/2"; |
459 | if (this.penaltyFlags['w'] == 2) return "0-1"; | |
460 | if (this.penaltyFlags['b'] == 2) return "1-0"; | |
1a3cfdc0 BA |
461 | if (!this.atLeastOneMove('w') || !this.atLeastOneMove('b')) |
462 | // Stalemate (should be very rare) | |
463 | return "1/2"; | |
464 | return "*"; | |
465 | } | |
466 | ||
467 | getComputerMove() { | |
468 | const maxeval = V.INFINITY; | |
469 | const color = this.turn; | |
470 | let moves = this.getAllValidMoves(); | |
471 | if (moves.length == 0) | |
472 | // TODO: this situation should not happen | |
473 | return null; | |
474 | ||
1a3cfdc0 | 475 | // Rank moves at depth 1: |
9edfb714 BA |
476 | let validMoves = []; |
477 | let illegalMoves = []; | |
1a3cfdc0 | 478 | moves.forEach(m => { |
9edfb714 | 479 | // Warning: m might be illegal! |
6e0f2842 | 480 | if (!m.end.illegal) { |
9edfb714 BA |
481 | V.PlayOnBoard(this.board, m); |
482 | m.eval = this.evalPosition(); | |
483 | V.UndoOnBoard(this.board, m); | |
484 | validMoves.push(m); | |
485 | } else illegalMoves.push(m); | |
1a3cfdc0 | 486 | }); |
9edfb714 BA |
487 | |
488 | const illegalRatio = illegalMoves.length / moves.length; | |
489 | if (Math.random() < illegalRatio) | |
490 | // Return a random illegal move | |
491 | return illegalMoves[randInt(illegalMoves.length)]; | |
492 | ||
493 | validMoves.sort((a, b) => { | |
1a3cfdc0 BA |
494 | return (color == "w" ? 1 : -1) * (b.eval - a.eval); |
495 | }); | |
496 | let candidates = [0]; | |
9edfb714 BA |
497 | for ( |
498 | let i = 1; | |
499 | i < validMoves.length && validMoves[i].eval == moves[0].eval; | |
500 | i++ | |
501 | ) { | |
1a3cfdc0 | 502 | candidates.push(i); |
9edfb714 BA |
503 | } |
504 | return validMoves[candidates[randInt(candidates.length)]]; | |
1a3cfdc0 BA |
505 | } |
506 | ||
507 | getNotation(move) { | |
508 | // Basic system: piece + init + dest square | |
509 | return ( | |
54f51146 | 510 | (move.vanish[0].p == V.KNIGHT ? "N" : "") + |
1a3cfdc0 BA |
511 | V.CoordsToSquare(move.start) + |
512 | V.CoordsToSquare(move.end) | |
513 | ); | |
514 | } | |
515 | }; |