From: Benjamin Auder Date: Fri, 28 Oct 2022 14:08:41 +0000 (+0200) Subject: Some advances in Checkered variant X-Git-Url: https://git.auder.net/variants/current/doc/doc/html/index.html?a=commitdiff_plain;h=8d19ea48d57c7d97dd1c6f5b6d4c3132cbf2075c;p=xogo.git Some advances in Checkered variant --- diff --git a/variants/Checkered/class.js b/variants/Checkered/class.js index 6ef3353..3148064 100644 --- a/variants/Checkered/class.js +++ b/variants/Checkered/class.js @@ -15,7 +15,6 @@ export default class CheckeredRules extends ChessRules { defaut: false } ], - // Game modifiers (using "elementary variants"). Default: false styles: [ "balance", "capture", @@ -37,7 +36,8 @@ export default class CheckeredRules extends ChessRules { b: "c", n: "o" }; - if (b[0] == "c") return checkered_codes[b[1]]; + if (b[0] == "c") + return checkered_codes[b[1]]; return super.board2fen(b); } @@ -60,7 +60,40 @@ export default class CheckeredRules extends ChessRules { return super.fen2board(f); } - // TODO: pieces() + pieces(color, x, y) { + let baseRes = super.pieces(color, x, y); + if ( + this.getPiece(x, y) == 'p' && + this.stage == 2 && + this.getColor(x, y) == 'c' + ) { + // Checkered pawns on stage 2 are bidirectional + const initRank = ((color == 'w' && x >= 6) || (color == 'b' && x <= 1)); + baseRes['p'] = { + "class": "pawn", + moves: [ + { + steps: [[1, 0], [-1, 0]], + range: (initRank ? 2 : 1) + } + ], + attack: [ + { + steps: [[1, 1], [1, -1], [-1, 1], [-1, -1]], + range: 1 + } + ] + }; + } + const checkered = { + 's': {"class": "checkered-pawn", moveas: 'p'}, + 'u': {"class": "checkered-rook", moveas: 'r'}, + 'o': {"class": "checkered-knight", moveas: 'n'}, + 'c': {"class": "checkered-bishop", moveas: 'b'}, + 't': {"class": "checkered-queen", moveas: 'q'} + }; + return Object.assign(baseRes, checkered); + } setOtherVariables(fenParsed) { super.setOtherVariables(fenParsed); @@ -130,110 +163,81 @@ export default class CheckeredRules extends ChessRules { const color2 = this.getColor(x2, y2); return color1 != color2 && [color1, color2].includes('c'); } - // Checkered aren't captured return ( color1 != color2 && - color2 != "c" && + color2 != "c" && //checkered aren't captured (color1 != "c" || color2 != this.turn) ); } - // TODO:::: - getPotentialMovesFrom([x, y], noswitch) { - let standardMoves = super.getPotentialMovesFrom([x, y]); - if (this.stage == 1) { - const color = this.turn; - // Post-processing: apply "checkerization" of standard moves - const lastRank = (color == "w" ? 0 : 7); - let moves = []; - // King is treated differently: it never turn checkered - if (this.getPiece(x, y) == V.KING) { - // If at least one checkered piece, allow switching: - if ( - this.canSwitch && !noswitch && - this.board.some(b => b.some(cell => cell[0] == 'c')) - ) { - const oppCol = V.GetOppCol(color); - moves.push( - new Move({ - start: { x: x, y: y }, - end: { x: this.kingPos[oppCol][0], y: this.kingPos[oppCol][1] }, - appear: [], - vanish: [] - }) - ); - } - return standardMoves.concat(moves); + postProcessPotentialMoves(moves) { + if (this.stage == 2 || moves.length == 0) + return moves; + const color = this.turn; + // Apply "checkerization" of standard moves + const lastRank = (color == "w" ? 0 : 7); + const [x, y] = [moves[0].start.x, moves[0].start.y]; + let moves = []; + const piece = this.getPiece(x, y); + // King is treated differently: it never turn checkered + if (piece == 'k') { + // If at least one checkered piece, allow switching: + if ( + this.canSwitch && !noswitch && + this.board.some(b => b.some(cell => cell[0] == 'c')) + ) { + const oppCol = C.GetOppCol(color); + const oppKingPos = this.searchKingPos(oppCol)[0]; + moves.push( + new Move({ + start: { x: x, y: y }, + end: { x: oppKingPos[0], y: oppKingPos[1] }, + appear: [], + vanish: [] + }) + ); } - standardMoves.forEach(m => { - if (m.vanish[0].p == V.PAWN) { + return moves; + } + if (piece == 'p') { + // Filter out forbidden pawn moves + moves = moves.filter(m => { + if (m.vanish[0].p == 'p') { if ( Math.abs(m.end.x - m.start.x) == 2 && !this.pawnFlags[this.turn][m.start.y] ) { - return; //skip forbidden 2-squares jumps + return false; //forbidden 2-squares jumps } if ( this.board[m.end.x][m.end.y] == V.EMPTY && m.vanish.length == 2 && this.getColor(m.start.x, m.start.y) == "c" ) { - return; //checkered pawns cannot take en-passant - } - } - if (m.vanish.length == 1) - // No capture - moves.push(m); - else { - // A capture occured (m.vanish.length == 2) - m.appear[0].c = "c"; - moves.push(m); - if ( - // Avoid promotions (already treated): - m.appear[0].p != m.vanish[1].p && - (m.vanish[0].p != V.PAWN || m.end.x != lastRank) - ) { - // Add transformation into captured piece - let m2 = JSON.parse(JSON.stringify(m)); - m2.appear[0].p = m.vanish[1].p; - moves.push(m2); + return false; //checkered pawns cannot take en-passant } } + return true; }); - return moves; } - return standardMoves; - } - - // TODO: merge this into pieces() method - getPotentialPawnMoves([x, y]) { - const color = this.getColor(x, y); - if (this.stage == 2) { - const saveTurn = this.turn; - if (this.sideCheckered == this.turn) { - // Cannot change PawnSpecs.bidirectional, so cheat a little: - this.turn = 'w'; - const wMoves = super.getPotentialPawnMoves([x, y]); - this.turn = 'b'; - const bMoves = super.getPotentialPawnMoves([x, y]); - this.turn = saveTurn; - return wMoves.concat(bMoves); + let extraMoves = []; + moves.forEach(m => { + if (m.vanish.length == 2 && m.appear.length == 1) + // A capture occured + m.appear[0].c = "c"; + if ( + m.appear[0].p != m.vanish[1].p && + // No choice if promotion: + (m.vanish[0].p != 'p' || m.end.x != lastRank) + ) { + // Add transformation into captured piece + let m2 = JSON.parse(JSON.stringify(m)); + m2.appear[0].p = m.vanish[1].p; + extraMoves.push(m2); + } } - // Playing with both colors: - this.turn = color; - const moves = super.getPotentialPawnMoves([x, y]); - this.turn = saveTurn; - return moves; - } - let moves = super.getPotentialPawnMoves([x, y]); - // Post-process: set right color for checkered moves - if (color == 'c') { - moves.forEach(m => { - m.appear[0].c = 'c'; //may be done twice if capture - m.vanish[0].c = 'c'; - }); - } - return moves; + }); + return moves.concat(extraMoves); } canIplay(side, [x, y]) { @@ -264,15 +268,15 @@ export default class CheckeredRules extends ChessRules { // TODO: adapt, merge filterValid(moves) { - if (moves.length == 0) return []; + if (moves.length == 0) + return []; const color = this.turn; - const oppCol = V.GetOppCol(color); - const L = this.cmoves.length; //at least 1: init from FEN - const stage = this.stage; //may change if switch + const oppCol = C.GetOppCol(color); return moves.filter(m => { // Checkered cannot be under check (no king) - if (stage == 2 && this.sideCheckered == color) return true; - this.play(m); + if (stage == 2 && this.sideCheckered == color) + return true; + this.playOnBoard(m); let res = true; if (stage == 1) { if (m.appear.length == 0 && m.vanish.length == 0) { @@ -284,7 +288,7 @@ export default class CheckeredRules extends ChessRules { this.getAllPotentialMoves().length > 0 ); } - else res = !this.oppositeMoves(this.cmoves[L - 1], m); + else res = !this.oppositeMoves(this.cmove, m); } if (res && m.appear.length > 0) res = !this.underCheck(color); // At stage 2, side with B & W can be undercheck with both kings: @@ -312,7 +316,7 @@ export default class CheckeredRules extends ChessRules { ) ) ) { - const moves = this.getPotentialMovesFrom([i, j], "noswitch"); + const moves = this.getPotentialMovesFrom([i, j]); if (moves.length > 0) { for (let k = 0; k < moves.length; k++) if (this.filterValid([moves[k]]).length > 0) return true;