| 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 | getPartFen(o) { |
| 64 | return Object.assign( |
| 65 | { |
| 66 | "cmove": o.init ? "-" : this.getCmoveFen(), |
| 67 | "stage": o.init ? "1" : this.getStageFen() |
| 68 | }, |
| 69 | super.getPartFen(o) |
| 70 | ); |
| 71 | } |
| 72 | |
| 73 | getCmoveFen() { |
| 74 | if (!this.cmove) |
| 75 | return "-"; |
| 76 | return ( |
| 77 | C.CoordsToSquare(this.cmove.start) + C.CoordsToSquare(this.cmove.end) |
| 78 | ); |
| 79 | } |
| 80 | |
| 81 | getStageFen() { |
| 82 | return (this.stage + this.sideCheckered); |
| 83 | } |
| 84 | |
| 85 | getFlagsFen() { |
| 86 | let fen = super.getFlagsFen(); |
| 87 | // Add pawns flags |
| 88 | for (let c of ["w", "b"]) { |
| 89 | for (let i = 0; i < 8; i++) |
| 90 | fen += (this.pawnFlags[c][i] ? "1" : "0"); |
| 91 | } |
| 92 | return fen; |
| 93 | } |
| 94 | |
| 95 | getPawnShift(color) { |
| 96 | return super.getPawnShift(color == 'c' ? this.turn : color); |
| 97 | } |
| 98 | |
| 99 | getOppCols(color) { |
| 100 | if (this.stage == 1) |
| 101 | return super.getOppCols(color).concat(['c']); |
| 102 | // Stage 2: depends if color is w+b or checkered |
| 103 | if (color == this.sideCheckered) |
| 104 | return ['w', 'b']; |
| 105 | return ['c']; |
| 106 | } |
| 107 | |
| 108 | pieces(color, x, y) { |
| 109 | let baseRes = super.pieces(color, x, y); |
| 110 | if ( |
| 111 | this.getPiece(x, y) == 'p' && |
| 112 | this.stage == 2 && |
| 113 | this.getColor(x, y) == 'c' |
| 114 | ) { |
| 115 | // Checkered pawns on stage 2 are bidirectional |
| 116 | const initRank = ((color == 'w' && x >= 6) || (color == 'b' && x <= 1)); |
| 117 | baseRes['p'] = { |
| 118 | "class": "pawn", |
| 119 | moves: [ |
| 120 | { |
| 121 | steps: [[1, 0], [-1, 0]], |
| 122 | range: (initRank ? 2 : 1) |
| 123 | } |
| 124 | ], |
| 125 | attack: [ |
| 126 | { |
| 127 | steps: [[1, 1], [1, -1], [-1, 1], [-1, -1]], |
| 128 | range: 1 |
| 129 | } |
| 130 | ] |
| 131 | }; |
| 132 | } |
| 133 | const checkered = { |
| 134 | 's': {"class": "checkered-pawn", moveas: 'p'}, |
| 135 | 'u': {"class": "checkered-rook", moveas: 'r'}, |
| 136 | 'o': {"class": "checkered-knight", moveas: 'n'}, |
| 137 | 'c': {"class": "checkered-bishop", moveas: 'b'}, |
| 138 | 't': {"class": "checkered-queen", moveas: 'q'} |
| 139 | }; |
| 140 | return Object.assign(baseRes, checkered); |
| 141 | } |
| 142 | |
| 143 | setOtherVariables(fenParsed) { |
| 144 | super.setOtherVariables(fenParsed); |
| 145 | // Non-capturing last checkered move (if any) |
| 146 | const cmove = fenParsed.cmove; |
| 147 | if (cmove == "-") this.cmove = null; |
| 148 | else { |
| 149 | this.cmove = { |
| 150 | start: C.SquareToCoords(cmove.substr(0, 2)), |
| 151 | end: C.SquareToCoords(cmove.substr(2)) |
| 152 | }; |
| 153 | } |
| 154 | // Stage 1: as Checkered2. Stage 2: checkered pieces are autonomous |
| 155 | const stageInfo = fenParsed.stage; |
| 156 | this.stage = parseInt(stageInfo[0], 10); |
| 157 | this.sideCheckered = (this.stage == 2 ? stageInfo[1] : ""); |
| 158 | } |
| 159 | |
| 160 | setFlags(fenflags) { |
| 161 | super.setFlags(fenflags); //castleFlags |
| 162 | this.pawnFlags = { |
| 163 | w: [...Array(8)], //pawns can move 2 squares? |
| 164 | b: [...Array(8)] |
| 165 | }; |
| 166 | const flags = fenflags.substr(4); //skip first 4 letters, for castle |
| 167 | for (let c of ["w", "b"]) { |
| 168 | for (let i = 0; i < 8; i++) |
| 169 | this.pawnFlags[c][i] = flags.charAt((c == "w" ? 0 : 8) + i) == "1"; |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | getEpSquare(moveOrSquare) { |
| 174 | // At stage 2, all pawns can be captured en-passant |
| 175 | if ( |
| 176 | this.stage == 2 || |
| 177 | typeof moveOrSquare !== "object" || |
| 178 | (moveOrSquare.appear.length > 0 && moveOrSquare.appear[0].c != 'c') |
| 179 | ) |
| 180 | return super.getEpSquare(moveOrSquare); |
| 181 | // Checkered or switch move: no en-passant |
| 182 | return undefined; |
| 183 | } |
| 184 | |
| 185 | getCmove(move) { |
| 186 | // No checkered move to undo at stage 2: |
| 187 | if (this.stage == 1 && move.vanish.length == 1 && move.appear[0].c == "c") |
| 188 | return {start: move.start, end: move.end}; |
| 189 | return null; |
| 190 | } |
| 191 | |
| 192 | canTake([x1, y1], [x2, y2]) { |
| 193 | const color1 = this.getColor(x1, y1); |
| 194 | const color2 = this.getColor(x2, y2); |
| 195 | if (this.stage == 2) { |
| 196 | // Black & White <-- takes --> Checkered |
| 197 | const color1 = this.getColor(x1, y1); |
| 198 | const color2 = this.getColor(x2, y2); |
| 199 | return color1 != color2 && [color1, color2].includes('c'); |
| 200 | } |
| 201 | return ( |
| 202 | color1 != color2 && |
| 203 | color2 != "c" && //checkered aren't captured |
| 204 | (color1 != "c" || color2 != this.turn) |
| 205 | ); |
| 206 | } |
| 207 | |
| 208 | postProcessPotentialMoves(moves) { |
| 209 | if (this.stage == 2 || moves.length == 0) |
| 210 | return moves; |
| 211 | const color = this.turn; |
| 212 | // Apply "checkerization" of standard moves |
| 213 | const lastRank = (color == "w" ? 0 : 7); |
| 214 | const [x, y] = [moves[0].start.x, moves[0].start.y]; |
| 215 | const piece = this.getPiece(x, y); |
| 216 | // King is treated differently: it never turn checkered |
| 217 | if (piece == 'k' && this.stage == 1) { |
| 218 | // If at least one checkered piece, allow switching: |
| 219 | if ( |
| 220 | this.options["withswitch"] && |
| 221 | this.board.some(b => b.some(cell => cell[0] == 'c')) |
| 222 | ) { |
| 223 | const oppKingPos = this.searchKingPos(C.GetOppTurn(this.turn))[0]; |
| 224 | moves.push( |
| 225 | new Move({ |
| 226 | start: { x: x, y: y }, |
| 227 | end: {x: oppKingPos[0], y: oppKingPos[1]}, |
| 228 | appear: [], |
| 229 | vanish: [] |
| 230 | }) |
| 231 | ); |
| 232 | } |
| 233 | return moves; |
| 234 | } |
| 235 | if (piece == 'p') { |
| 236 | // Filter out forbidden pawn moves |
| 237 | moves = moves.filter(m => { |
| 238 | if (m.vanish.length > 0 && m.vanish[0].p == 'p') { |
| 239 | if ( |
| 240 | Math.abs(m.end.x - m.start.x) == 2 && |
| 241 | !this.pawnFlags[this.turn][m.start.y] |
| 242 | ) { |
| 243 | return false; //forbidden 2-squares jumps |
| 244 | } |
| 245 | if ( |
| 246 | this.board[m.end.x][m.end.y] == V.EMPTY && |
| 247 | m.vanish.length == 2 && |
| 248 | this.getColor(m.start.x, m.start.y) == "c" |
| 249 | ) { |
| 250 | return false; //checkered pawns cannot take en-passant |
| 251 | } |
| 252 | } |
| 253 | return true; |
| 254 | }); |
| 255 | } |
| 256 | let extraMoves = []; |
| 257 | moves.forEach(m => { |
| 258 | if (m.vanish.length == 2 && m.appear.length == 1) { |
| 259 | // A capture occured |
| 260 | m.appear[0].c = "c"; |
| 261 | if ( |
| 262 | m.appear[0].p != m.vanish[1].p && |
| 263 | // No choice if promotion: |
| 264 | (m.vanish[0].p != 'p' || m.end.x != lastRank) |
| 265 | ) { |
| 266 | // Add transformation into captured piece |
| 267 | let m2 = JSON.parse(JSON.stringify(m)); |
| 268 | m2.appear[0].p = m.vanish[1].p; |
| 269 | extraMoves.push(m2); |
| 270 | } |
| 271 | } |
| 272 | }); |
| 273 | return moves.concat(extraMoves); |
| 274 | } |
| 275 | |
| 276 | canIplay(x, y) { |
| 277 | if (this.stage == 2) { |
| 278 | const color = this.getColor(x, y); |
| 279 | return ( |
| 280 | this.turn == this.sideCheckered |
| 281 | ? color == 'c' |
| 282 | : ['w', 'b'].includes(color) |
| 283 | ); |
| 284 | } |
| 285 | return ( |
| 286 | this.playerColor == this.turn && |
| 287 | [this.turn, "c"].includes(this.getColor(x, y)) |
| 288 | ); |
| 289 | } |
| 290 | |
| 291 | // Does m2 un-do m1 ? (to disallow undoing checkered moves) |
| 292 | oppositeMoves(m1, m2) { |
| 293 | return ( |
| 294 | !!m1 && |
| 295 | m2.appear.length == 1 && |
| 296 | m2.vanish.length == 1 && |
| 297 | m2.appear[0].c == "c" && |
| 298 | m1.start.x == m2.end.x && |
| 299 | m1.end.x == m2.start.x && |
| 300 | m1.start.y == m2.end.y && |
| 301 | m1.end.y == m2.start.y |
| 302 | ); |
| 303 | } |
| 304 | |
| 305 | filterValid(moves) { |
| 306 | const color = this.turn; |
| 307 | if (stage == 2 && this.sideCheckered == color) |
| 308 | // Checkered cannot be under check (no king) |
| 309 | return moves; |
| 310 | let kingPos = super.searchKingPos(color); |
| 311 | if (this.stage == 2) |
| 312 | // Must consider both kings (attacked by checkered side) |
| 313 | kingPos = [kingPos, super.searchKingPos(C.GetOppTurn(this.turn))]; |
| 314 | const oppCols = this.getOppCols(color); |
| 315 | return moves.filter(m => { |
| 316 | this.playOnBoard(m); |
| 317 | let res = true; |
| 318 | if (stage == 1) |
| 319 | res = !this.oppositeMoves(this.cmove, m); |
| 320 | if (res && m.appear.length > 0) |
| 321 | res = !this.underCheck(kingPos, oppCols); |
| 322 | this.undoOnBoard(m); |
| 323 | return res; |
| 324 | }); |
| 325 | } |
| 326 | |
| 327 | atLeastOneMove(color) { |
| 328 | const myCols = [color, 'c']; |
| 329 | for (let i = 0; i < this.size.x; i++) { |
| 330 | for (let j = 0; j < this.size.y; j++) { |
| 331 | const colIJ = this.getColor(i, j); |
| 332 | if ( |
| 333 | this.board[i][j] != "" && |
| 334 | ( |
| 335 | (this.stage == 1 && myCols.includes(colIJ)) || |
| 336 | (this.stage == 2 && |
| 337 | ( |
| 338 | (this.sideCheckered == color && colIJ == 'c') || |
| 339 | (this.sideCheckered != color && ['w', 'b'].includes(colIJ)) |
| 340 | ) |
| 341 | ) |
| 342 | ) |
| 343 | ) { |
| 344 | const moves = this.getPotentialMovesFrom([i, j]); |
| 345 | if (moves.some(m => this.filterValid([m]).length >= 1)) |
| 346 | return true; |
| 347 | } |
| 348 | } |
| 349 | } |
| 350 | return false; |
| 351 | } |
| 352 | |
| 353 | underCheck(square_s, oppCols) { |
| 354 | if (this.stage == 2 && oppCol != this.sideCheckered) |
| 355 | return false; //checkered pieces is me, I'm not under check |
| 356 | return super.underAttack(square_s, oppCols); |
| 357 | } |
| 358 | |
| 359 | prePlay(move) { |
| 360 | if (move.appear.length > 0 && move.vanish.length > 0) { |
| 361 | super.prePlay(move); |
| 362 | if ( |
| 363 | [1, 6].includes(move.start.x) && |
| 364 | move.vanish[0].p == V.PAWN && |
| 365 | Math.abs(move.end.x - move.start.x) == 2 |
| 366 | ) { |
| 367 | // This move turns off a 2-squares pawn flag |
| 368 | this.pawnFlags[move.start.x == 6 ? "w" : "b"][move.start.y] = false; |
| 369 | } |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | postPlay(move) { |
| 374 | if (move.appear.length == 0 && move.vanish.length == 0) { |
| 375 | this.stage = 2; |
| 376 | this.sideCheckered = this.turn; |
| 377 | } |
| 378 | else |
| 379 | super.postPlay(move); |
| 380 | this.cmove = this.getCmove(move); |
| 381 | } |
| 382 | |
| 383 | tryChangeTurn(move) { |
| 384 | if (move.appear.length > 0 && move.vanish.length > 0) |
| 385 | super.tryChangeTurn(move); |
| 386 | } |
| 387 | |
| 388 | getCurrentScore() { |
| 389 | const color = this.turn; |
| 390 | if (this.stage == 1) { |
| 391 | if (this.atLeastOneMove(color)) |
| 392 | return "*"; |
| 393 | // Artifically change turn, for checkered pawns |
| 394 | const oppTurn = C.GetOppTurn(color); |
| 395 | this.turn = oppTurn; |
| 396 | const kingPos = super.searchKingPos(color)[0]; |
| 397 | let res = "1/2"; |
| 398 | if (super.underAttack(kingPos, [oppTurn, 'c'])) |
| 399 | res = (color == "w" ? "0-1" : "1-0"); |
| 400 | this.turn = color; |
| 401 | return res; |
| 402 | } |
| 403 | // Stage == 2: |
| 404 | if (this.sideCheckered == color) { |
| 405 | // Check if remaining checkered pieces: if none, I lost |
| 406 | if (this.board.some(b => b.some(cell => cell[0] == 'c'))) { |
| 407 | if (!this.atLeastOneMove(color)) |
| 408 | return "1/2"; |
| 409 | return "*"; |
| 410 | } |
| 411 | return (color == 'w' ? "0-1" : "1-0"); |
| 412 | } |
| 413 | if (this.atLeastOneMove(color)) |
| 414 | return "*"; |
| 415 | let res = super.underAttack(super.searchKingPos(color)[0], ['c']); |
| 416 | if (!res) |
| 417 | res = super.underAttack(super.searchKingPos(oppCol)[0], ['c']); |
| 418 | if (res) |
| 419 | return (color == 'w' ? "0-1" : "1-0"); |
| 420 | return "1/2"; |
| 421 | } |
| 422 | |
| 423 | }; |