| 1 | import ChessRules from "/base_rules.js"; |
| 2 | import PiPo from "/utils/PiPo.js"; |
| 3 | import Move from "/utils/Move.js"; |
| 4 | |
| 5 | export default class CheckeredRules extends ChessRules { |
| 6 | |
| 7 | static get Options() { |
| 8 | return { |
| 9 | select: C.Options.select, |
| 10 | input: [ |
| 11 | { |
| 12 | label: "Allow switching", |
| 13 | variable: "withswitch", |
| 14 | type: "checkbox", |
| 15 | defaut: false |
| 16 | } |
| 17 | ], |
| 18 | styles: [ |
| 19 | "balance", |
| 20 | "capture", |
| 21 | "cylinder", |
| 22 | "doublemove", |
| 23 | "madrasi", |
| 24 | "progressive", |
| 25 | "recycle", |
| 26 | "teleport" |
| 27 | ] |
| 28 | }; |
| 29 | } |
| 30 | |
| 31 | static board2fen(b) { |
| 32 | const checkered_codes = { |
| 33 | p: "s", |
| 34 | q: "t", |
| 35 | r: "u", |
| 36 | b: "c", |
| 37 | n: "o" |
| 38 | }; |
| 39 | if (b[0] == "c") |
| 40 | return checkered_codes[b[1]]; |
| 41 | return super.board2fen(b); |
| 42 | } |
| 43 | |
| 44 | static fen2board(f) { |
| 45 | // Tolerate upper-case versions of checkered pieces (why not?) |
| 46 | const checkered_pieces = { |
| 47 | s: "p", |
| 48 | S: "p", |
| 49 | t: "q", |
| 50 | T: "q", |
| 51 | u: "r", |
| 52 | U: "r", |
| 53 | c: "b", |
| 54 | C: "b", |
| 55 | o: "n", |
| 56 | O: "n" |
| 57 | }; |
| 58 | if (Object.keys(checkered_pieces).includes(f)) |
| 59 | return "c" + checkered_pieces[f]; |
| 60 | return super.fen2board(f); |
| 61 | } |
| 62 | |
| 63 | pieces(color, x, y) { |
| 64 | let baseRes = super.pieces(color, x, y); |
| 65 | if ( |
| 66 | this.getPiece(x, y) == 'p' && |
| 67 | this.stage == 2 && |
| 68 | this.getColor(x, y) == 'c' |
| 69 | ) { |
| 70 | // Checkered pawns on stage 2 are bidirectional |
| 71 | const initRank = ((color == 'w' && x >= 6) || (color == 'b' && x <= 1)); |
| 72 | baseRes['p'] = { |
| 73 | "class": "pawn", |
| 74 | moves: [ |
| 75 | { |
| 76 | steps: [[1, 0], [-1, 0]], |
| 77 | range: (initRank ? 2 : 1) |
| 78 | } |
| 79 | ], |
| 80 | attack: [ |
| 81 | { |
| 82 | steps: [[1, 1], [1, -1], [-1, 1], [-1, -1]], |
| 83 | range: 1 |
| 84 | } |
| 85 | ] |
| 86 | }; |
| 87 | } |
| 88 | const checkered = { |
| 89 | 's': {"class": "checkered-pawn", moveas: 'p'}, |
| 90 | 'u': {"class": "checkered-rook", moveas: 'r'}, |
| 91 | 'o': {"class": "checkered-knight", moveas: 'n'}, |
| 92 | 'c': {"class": "checkered-bishop", moveas: 'b'}, |
| 93 | 't': {"class": "checkered-queen", moveas: 'q'} |
| 94 | }; |
| 95 | return Object.assign(baseRes, checkered); |
| 96 | } |
| 97 | |
| 98 | setOtherVariables(fenParsed) { |
| 99 | super.setOtherVariables(fenParsed); |
| 100 | // Non-capturing last checkered move (if any) |
| 101 | const cmove = fenParsed.cmove; |
| 102 | if (cmove == "-") this.cmove = null; |
| 103 | else { |
| 104 | this.cmove = { |
| 105 | start: C.SquareToCoords(cmove.substr(0, 2)), |
| 106 | end: C.SquareToCoords(cmove.substr(2)) |
| 107 | }; |
| 108 | } |
| 109 | // Stage 1: as Checkered2. Stage 2: checkered pieces are autonomous |
| 110 | const stageInfo = fenParsed.stage; |
| 111 | this.stage = parseInt(stageInfo[0], 10); |
| 112 | this.canSwitch = (this.stage == 1 && stageInfo[1] != '-'); |
| 113 | this.sideCheckered = (this.stage == 2 ? stageInfo[1] : undefined); |
| 114 | } |
| 115 | |
| 116 | setFlags(fenflags) { |
| 117 | super.setFlags(fenflags); //castleFlags |
| 118 | this.pawnFlags = { |
| 119 | w: [...Array(8)], //pawns can move 2 squares? |
| 120 | b: [...Array(8)] |
| 121 | }; |
| 122 | const flags = fenflags.substr(4); //skip first 4 letters, for castle |
| 123 | for (let c of ["w", "b"]) { |
| 124 | for (let i = 0; i < 8; i++) |
| 125 | this.pawnFlags[c][i] = flags.charAt((c == "w" ? 0 : 8) + i) == "1"; |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | aggregateFlags() { |
| 130 | return [this.castleFlags, this.pawnFlags]; |
| 131 | } |
| 132 | |
| 133 | disaggregateFlags(flags) { |
| 134 | this.castleFlags = flags[0]; |
| 135 | this.pawnFlags = flags[1]; |
| 136 | } |
| 137 | |
| 138 | getEpSquare(moveOrSquare) { |
| 139 | // At stage 2, all pawns can be captured en-passant |
| 140 | if ( |
| 141 | this.stage == 2 || |
| 142 | typeof moveOrSquare !== "object" || |
| 143 | (moveOrSquare.appear.length > 0 && moveOrSquare.appear[0].c != 'c') |
| 144 | ) |
| 145 | return super.getEpSquare(moveOrSquare); |
| 146 | // Checkered or switch move: no en-passant |
| 147 | return undefined; |
| 148 | } |
| 149 | |
| 150 | getCmove(move) { |
| 151 | // No checkered move to undo at stage 2: |
| 152 | if (this.stage == 1 && move.vanish.length == 1 && move.appear[0].c == "c") |
| 153 | return { start: move.start, end: move.end }; |
| 154 | return null; |
| 155 | } |
| 156 | |
| 157 | canTake([x1, y1], [x2, y2]) { |
| 158 | const color1 = this.getColor(x1, y1); |
| 159 | const color2 = this.getColor(x2, y2); |
| 160 | if (this.stage == 2) { |
| 161 | // Black & White <-- takes --> Checkered |
| 162 | const color1 = this.getColor(x1, y1); |
| 163 | const color2 = this.getColor(x2, y2); |
| 164 | return color1 != color2 && [color1, color2].includes('c'); |
| 165 | } |
| 166 | return ( |
| 167 | color1 != color2 && |
| 168 | color2 != "c" && //checkered aren't captured |
| 169 | (color1 != "c" || color2 != this.turn) |
| 170 | ); |
| 171 | } |
| 172 | |
| 173 | postProcessPotentialMoves(moves) { |
| 174 | if (this.stage == 2 || moves.length == 0) |
| 175 | return moves; |
| 176 | const color = this.turn; |
| 177 | // Apply "checkerization" of standard moves |
| 178 | const lastRank = (color == "w" ? 0 : 7); |
| 179 | const [x, y] = [moves[0].start.x, moves[0].start.y]; |
| 180 | let moves = []; |
| 181 | const piece = this.getPiece(x, y); |
| 182 | // King is treated differently: it never turn checkered |
| 183 | if (piece == 'k') { |
| 184 | // If at least one checkered piece, allow switching: |
| 185 | if ( |
| 186 | this.canSwitch && !noswitch && |
| 187 | this.board.some(b => b.some(cell => cell[0] == 'c')) |
| 188 | ) { |
| 189 | const oppCol = C.GetOppCol(color); |
| 190 | const oppKingPos = this.searchKingPos(oppCol)[0]; |
| 191 | moves.push( |
| 192 | new Move({ |
| 193 | start: { x: x, y: y }, |
| 194 | end: { x: oppKingPos[0], y: oppKingPos[1] }, |
| 195 | appear: [], |
| 196 | vanish: [] |
| 197 | }) |
| 198 | ); |
| 199 | } |
| 200 | return moves; |
| 201 | } |
| 202 | if (piece == 'p') { |
| 203 | // Filter out forbidden pawn moves |
| 204 | moves = moves.filter(m => { |
| 205 | if (m.vanish[0].p == 'p') { |
| 206 | if ( |
| 207 | Math.abs(m.end.x - m.start.x) == 2 && |
| 208 | !this.pawnFlags[this.turn][m.start.y] |
| 209 | ) { |
| 210 | return false; //forbidden 2-squares jumps |
| 211 | } |
| 212 | if ( |
| 213 | this.board[m.end.x][m.end.y] == V.EMPTY && |
| 214 | m.vanish.length == 2 && |
| 215 | this.getColor(m.start.x, m.start.y) == "c" |
| 216 | ) { |
| 217 | return false; //checkered pawns cannot take en-passant |
| 218 | } |
| 219 | } |
| 220 | return true; |
| 221 | }); |
| 222 | } |
| 223 | let extraMoves = []; |
| 224 | moves.forEach(m => { |
| 225 | if (m.vanish.length == 2 && m.appear.length == 1) |
| 226 | // A capture occured |
| 227 | m.appear[0].c = "c"; |
| 228 | if ( |
| 229 | m.appear[0].p != m.vanish[1].p && |
| 230 | // No choice if promotion: |
| 231 | (m.vanish[0].p != 'p' || m.end.x != lastRank) |
| 232 | ) { |
| 233 | // Add transformation into captured piece |
| 234 | let m2 = JSON.parse(JSON.stringify(m)); |
| 235 | m2.appear[0].p = m.vanish[1].p; |
| 236 | extraMoves.push(m2); |
| 237 | } |
| 238 | } |
| 239 | }); |
| 240 | return moves.concat(extraMoves); |
| 241 | } |
| 242 | |
| 243 | canIplay(side, [x, y]) { |
| 244 | if (this.stage == 2) { |
| 245 | const color = this.getColor(x, y); |
| 246 | return ( |
| 247 | this.turn == this.sideCheckered |
| 248 | ? color == 'c' |
| 249 | : ['w', 'b'].includes(color) |
| 250 | ); |
| 251 | } |
| 252 | return side == this.turn && [side, "c"].includes(this.getColor(x, y)); |
| 253 | } |
| 254 | |
| 255 | // Does m2 un-do m1 ? (to disallow undoing checkered moves) |
| 256 | oppositeMoves(m1, m2) { |
| 257 | return ( |
| 258 | !!m1 && |
| 259 | m2.appear[0].c == "c" && |
| 260 | m2.appear.length == 1 && |
| 261 | m2.vanish.length == 1 && |
| 262 | m1.start.x == m2.end.x && |
| 263 | m1.end.x == m2.start.x && |
| 264 | m1.start.y == m2.end.y && |
| 265 | m1.end.y == m2.start.y |
| 266 | ); |
| 267 | } |
| 268 | |
| 269 | // TODO: adapt, merge |
| 270 | filterValid(moves) { |
| 271 | if (moves.length == 0) |
| 272 | return []; |
| 273 | const color = this.turn; |
| 274 | const oppCol = C.GetOppCol(color); |
| 275 | return moves.filter(m => { |
| 276 | // Checkered cannot be under check (no king) |
| 277 | if (stage == 2 && this.sideCheckered == color) |
| 278 | return true; |
| 279 | this.playOnBoard(m); |
| 280 | let res = true; |
| 281 | if (stage == 1) { |
| 282 | if (m.appear.length == 0 && m.vanish.length == 0) { |
| 283 | // Special "switch" move: kings must not be attacked by checkered. |
| 284 | // Not checking for oppositeMoves here: checkered are autonomous |
| 285 | res = ( |
| 286 | !this.isAttacked(this.kingPos['w'], ['c']) && |
| 287 | !this.isAttacked(this.kingPos['b'], ['c']) && |
| 288 | this.getAllPotentialMoves().length > 0 |
| 289 | ); |
| 290 | } |
| 291 | else res = !this.oppositeMoves(this.cmove, m); |
| 292 | } |
| 293 | if (res && m.appear.length > 0) res = !this.underCheck(color); |
| 294 | // At stage 2, side with B & W can be undercheck with both kings: |
| 295 | if (res && stage == 2) res = !this.underCheck(oppCol); |
| 296 | this.undo(m); |
| 297 | return res; |
| 298 | }); |
| 299 | } |
| 300 | |
| 301 | atLeastOneMove() { |
| 302 | const color = this.turn; |
| 303 | const oppCol = V.GetOppCol(color); |
| 304 | for (let i = 0; i < V.size.x; i++) { |
| 305 | for (let j = 0; j < V.size.y; j++) { |
| 306 | const colIJ = this.getColor(i, j); |
| 307 | if ( |
| 308 | this.board[i][j] != V.EMPTY && |
| 309 | ( |
| 310 | (this.stage == 1 && colIJ != oppCol) || |
| 311 | (this.stage == 2 && |
| 312 | ( |
| 313 | (this.sideCheckered == color && colIJ == 'c') || |
| 314 | (this.sideCheckered != color && ['w', 'b'].includes(colIJ)) |
| 315 | ) |
| 316 | ) |
| 317 | ) |
| 318 | ) { |
| 319 | const moves = this.getPotentialMovesFrom([i, j]); |
| 320 | if (moves.length > 0) { |
| 321 | for (let k = 0; k < moves.length; k++) |
| 322 | if (this.filterValid([moves[k]]).length > 0) return true; |
| 323 | } |
| 324 | } |
| 325 | } |
| 326 | } |
| 327 | return false; |
| 328 | } |
| 329 | |
| 330 | // TODO: adapt |
| 331 | underCheck(color) { |
| 332 | if (this.stage == 1) |
| 333 | return this.isAttacked(this.kingPos[color], [V.GetOppCol(color), "c"]); |
| 334 | if (color == this.sideCheckered) return false; |
| 335 | return ( |
| 336 | this.isAttacked(this.kingPos['w'], ["c"]) || |
| 337 | this.isAttacked(this.kingPos['b'], ["c"]) |
| 338 | ); |
| 339 | } |
| 340 | |
| 341 | play(move) { |
| 342 | move.flags = JSON.stringify(this.aggregateFlags()); |
| 343 | this.epSquares.push(this.getEpSquare(move)); |
| 344 | V.PlayOnBoard(this.board, move); |
| 345 | if (move.appear.length > 0 || move.vanish.length > 0) |
| 346 | { |
| 347 | this.turn = V.GetOppCol(this.turn); |
| 348 | this.movesCount++; |
| 349 | } |
| 350 | this.postPlay(move); |
| 351 | } |
| 352 | |
| 353 | postPlay(move) { |
| 354 | if (move.appear.length == 0 && move.vanish.length == 0) { |
| 355 | this.stage = 2; |
| 356 | this.sideCheckered = this.turn; |
| 357 | } |
| 358 | else { |
| 359 | const c = move.vanish[0].c; |
| 360 | const piece = move.vanish[0].p; |
| 361 | if (piece == V.KING) { |
| 362 | this.kingPos[c][0] = move.appear[0].x; |
| 363 | this.kingPos[c][1] = move.appear[0].y; |
| 364 | } |
| 365 | super.updateCastleFlags(move, piece); |
| 366 | if ( |
| 367 | [1, 6].includes(move.start.x) && |
| 368 | move.vanish[0].p == V.PAWN && |
| 369 | Math.abs(move.end.x - move.start.x) == 2 |
| 370 | ) { |
| 371 | // This move turns off a 2-squares pawn flag |
| 372 | this.pawnFlags[move.start.x == 6 ? "w" : "b"][move.start.y] = false; |
| 373 | } |
| 374 | } |
| 375 | this.cmove = this.getCmove(move); |
| 376 | } |
| 377 | |
| 378 | getCurrentScore() { |
| 379 | const color = this.turn; |
| 380 | if (this.stage == 1) { |
| 381 | if (this.atLeastOneMove()) return "*"; |
| 382 | // Artifically change turn, for checkered pawns |
| 383 | this.turn = V.GetOppCol(this.turn); |
| 384 | const res = |
| 385 | this.isAttacked(this.kingPos[color], [V.GetOppCol(color), "c"]) |
| 386 | ? color == "w" |
| 387 | ? "0-1" |
| 388 | : "1-0" |
| 389 | : "1/2"; |
| 390 | this.turn = V.GetOppCol(this.turn); |
| 391 | return res; |
| 392 | } |
| 393 | // Stage == 2: |
| 394 | if (this.sideCheckered == this.turn) { |
| 395 | // Check if remaining checkered pieces: if none, I lost |
| 396 | if (this.board.some(b => b.some(cell => cell[0] == 'c'))) { |
| 397 | if (!this.atLeastOneMove()) return "1/2"; |
| 398 | return "*"; |
| 399 | } |
| 400 | return color == 'w' ? "0-1" : "1-0"; |
| 401 | } |
| 402 | if (this.atLeastOneMove()) return "*"; |
| 403 | let res = this.isAttacked(this.kingPos['w'], ["c"]); |
| 404 | if (!res) res = this.isAttacked(this.kingPos['b'], ["c"]); |
| 405 | if (res) return color == 'w' ? "0-1" : "1-0"; |
| 406 | return "1/2"; |
| 407 | } |
| 408 | |
| 409 | // TODO: adapt |
| 410 | static GenRandInitFen(options) { |
| 411 | const baseFen = ChessRules.GenRandInitFen(options); |
| 412 | return ( |
| 413 | // Add 16 pawns flags + empty cmove + stage == 1: |
| 414 | baseFen.slice(0, -2) + "1111111111111111 - - 1" + |
| 415 | (!options["switch"] ? '-' : "") |
| 416 | ); |
| 417 | } |
| 418 | { |
| 419 | cmove: fenParts[5], |
| 420 | stage: fenParts[6] |
| 421 | } |
| 422 | |
| 423 | getCmoveFen() { |
| 424 | const L = this.cmoves.length; |
| 425 | return ( |
| 426 | !this.cmoves[L - 1] |
| 427 | ? "-" |
| 428 | : ChessRules.CoordsToSquare(this.cmoves[L - 1].start) + |
| 429 | ChessRules.CoordsToSquare(this.cmoves[L - 1].end) |
| 430 | ); |
| 431 | } |
| 432 | |
| 433 | getStageFen() { |
| 434 | if (this.stage == 1) return "1" + (!this.canSwitch ? '-' : ""); |
| 435 | // Stage == 2: |
| 436 | return "2" + this.sideCheckered; |
| 437 | } |
| 438 | |
| 439 | getFen() { |
| 440 | return ( |
| 441 | super.getFen() + " " + this.getCmoveFen() + " " + this.getStageFen() |
| 442 | ); |
| 443 | } |
| 444 | |
| 445 | getFlagsFen() { |
| 446 | let fen = super.getFlagsFen(); |
| 447 | // Add pawns flags |
| 448 | for (let c of ["w", "b"]) |
| 449 | for (let i = 0; i < 8; i++) fen += (this.pawnFlags[c][i] ? "1" : "0"); |
| 450 | return fen; |
| 451 | } |
| 452 | |
| 453 | }; |