X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=public%2Fjavascripts%2Fvariants%2FMarseille.js;h=2eb42606756a4256fb80f33ec5e4698f0eee426c;hb=0596f5e7f9a87acbb13445f1bb93e803e9f5ea3c;hp=6e72a23609152ec29d1475a5a03ac47c0ce5bbfc;hpb=1b61a94dbd13f6a37a89e62216615d2496c760a2;p=vchess.git diff --git a/public/javascripts/variants/Marseille.js b/public/javascripts/variants/Marseille.js index 6e72a236..2eb42606 100644 --- a/public/javascripts/variants/Marseille.js +++ b/public/javascripts/variants/Marseille.js @@ -43,15 +43,13 @@ class MarseilleRules extends ChessRules const parsedFen = V.ParseFen(fen); this.setFlags(parsedFen.flags); if (parsedFen.enpassant == "-") - this.epSquares = [ [undefined,undefined] ]; + this.epSquares = [ [undefined] ]; else { let res = []; const squares = parsedFen.enpassant.split(","); for (let sq of squares) res.push(V.SquareToCoords(sq)); - if (res.length == 1) - res.push(undefined); //always 2 slots in epSquares[i] this.epSquares = [ res ]; } this.scanKingsRooks(fen); @@ -73,40 +71,37 @@ class MarseilleRules extends ChessRules const startRank = (color == "w" ? sizeX-2 : 1); const lastRank = (color == "w" ? 0 : sizeX-1); const pawnColor = this.getColor(x,y); //can be different for checkered + const finalPieces = x + shiftX == lastRank + ? [V.ROOK,V.KNIGHT,V.BISHOP,V.QUEEN] + : [V.PAWN]; - if (x+shiftX >= 0 && x+shiftX < sizeX) //TODO: always true + // One square forward + if (this.board[x+shiftX][y] == V.EMPTY) { - const finalPieces = x + shiftX == lastRank - ? [V.ROOK,V.KNIGHT,V.BISHOP,V.QUEEN] - : [V.PAWN] - // One square forward - if (this.board[x+shiftX][y] == V.EMPTY) + for (let piece of finalPieces) { - for (let piece of finalPieces) - { - moves.push(this.getBasicMove([x,y], [x+shiftX,y], - {c:pawnColor,p:piece})); - } - // Next condition because pawns on 1st rank can generally jump - if ([startRank,firstRank].includes(x) - && this.board[x+2*shiftX][y] == V.EMPTY) - { - // Two squares jump - moves.push(this.getBasicMove([x,y], [x+2*shiftX,y])); - } + moves.push(this.getBasicMove([x,y], [x+shiftX,y], + {c:pawnColor,p:piece})); } - // Captures - for (let shiftY of [-1,1]) + // Next condition because pawns on 1st rank can generally jump + if ([startRank,firstRank].includes(x) + && this.board[x+2*shiftX][y] == V.EMPTY) { - if (y + shiftY >= 0 && y + shiftY < sizeY - && this.board[x+shiftX][y+shiftY] != V.EMPTY - && this.canTake([x,y], [x+shiftX,y+shiftY])) + // Two squares jump + moves.push(this.getBasicMove([x,y], [x+2*shiftX,y])); + } + } + // Captures + for (let shiftY of [-1,1]) + { + if (y + shiftY >= 0 && y + shiftY < sizeY + && this.board[x+shiftX][y+shiftY] != V.EMPTY + && this.canTake([x,y], [x+shiftX,y+shiftY])) + { + for (let piece of finalPieces) { - for (let piece of finalPieces) - { - moves.push(this.getBasicMove([x,y], [x+shiftX,y+shiftY], - {c:pawnColor,p:piece})); - } + moves.push(this.getBasicMove([x,y], [x+shiftX,y+shiftY], + {c:pawnColor,p:piece})); } } } @@ -127,6 +122,7 @@ class MarseilleRules extends ChessRules { if (this.subTurn == 1 || (epSqs.length == 2 && // Was this en-passant capture already played at subturn 1 ? + // (Or maybe the opponent filled the en-passant square with a piece) this.board[epSqs[0].x][epSqs[0].y] != V.EMPTY)) { if (sq.x == x+shiftX && Math.abs(sq.y - y) == 1) @@ -155,32 +151,30 @@ class MarseilleRules extends ChessRules move.color = this.turn; } move.flags = JSON.stringify(this.aggregateFlags()); - let lastEpsq = this.epSquares[this.epSquares.length-1]; - const epSq = this.getEpSquare(move); - if (lastEpsq.length == 1) - lastEpsq.push(epSq); - else - { - // New turn - let newEpsqs = [epSq]; - if (this.startAtFirstMove && this.moves.length == 0) - newEpsqs.push(undefined); //at first move, to force length==2 (TODO) - this.epSquares.push(newEpsqs); - } V.PlayOnBoard(this.board, move); + const epSq = this.getEpSquare(move); if (this.startAtFirstMove && this.moves.length == 0) + { this.turn = "b"; + this.epSquares.push([epSq]); + } // Does this move give check on subturn 1? If yes, skip subturn 2 else if (this.subTurn==1 && this.underCheck(this.getOppCol(this.turn))) { - this.epSquares[this.epSquares.length-1].push(undefined); this.turn = this.getOppCol(this.turn); + this.epSquares.push([epSq]); move.checkOnSubturn1 = true; } else { if (this.subTurn == 2) + { this.turn = this.getOppCol(this.turn); + let lastEpsq = this.epSquares[this.epSquares.length-1]; + lastEpsq.push(epSq); + } + else + this.epSquares.push([epSq]); this.subTurn = 3 - this.subTurn; } this.moves.push(move); @@ -192,31 +186,28 @@ class MarseilleRules extends ChessRules undo(move) { this.disaggregateFlags(JSON.parse(move.flags)); - let lastEpsq = this.epSquares[this.epSquares.length-1]; - if (lastEpsq.length == 2) - { - if (!!move.checkOnSubturn1 || - (this.startAtFirstMove && this.moves.length == 1)) - { - this.epSquares.pop(); //remove real + artificial e.p. squares - } - else - lastEpsq.pop(); - } - else - this.epSquares.pop(); V.UndoOnBoard(this.board, move); if (this.startAtFirstMove && this.moves.length == 1) + { this.turn = "w"; + this.epSquares.pop(); + } else if (move.checkOnSubturn1) { this.turn = this.getOppCol(this.turn); this.subTurn = 1; + this.epSquares.pop(); } else { if (this.subTurn == 1) + { this.turn = this.getOppCol(this.turn); + let lastEpsq = this.epSquares[this.epSquares.length-1]; + lastEpsq.pop(); + } + else + this.epSquares.pop(); this.subTurn = 3 - this.subTurn; } this.moves.pop(); @@ -226,6 +217,18 @@ class MarseilleRules extends ChessRules // NOTE: GenRandInitFen() is OK, // since at first move turn indicator is just "w" + static get VALUES() + { + return { + 'p': 1, + 'r': 5, + 'n': 3, + 'b': 3, + 'q': 7, //slightly less than in orthodox game + 'k': 1000 + }; + } + // No alpha-beta here, just adapted min-max at depth 2(+1) getComputerMove() { @@ -238,6 +241,7 @@ class MarseilleRules extends ChessRules // Search best (half) move for opponent turn const getBestMoveEval = () => { + const turnBefore = this.turn + this.subTurn; let moves = this.getAllValidMoves(); if (moves.length == 0) { @@ -250,7 +254,8 @@ class MarseilleRules extends ChessRules for (let m of moves) { this.play(m); - this.turn = color; //very artificial... + // Now turn is oppCol,2 if m doesn't give check + // Otherwise it's color,1. In both cases the next test makes sense if (!this.atLeastOneMove()) { const score = this.checkGameEnd(); @@ -259,14 +264,12 @@ class MarseilleRules extends ChessRules else { // Found a mate - this.turn = oppCol; this.undo(m); return maxeval * (score == "1-0" ? 1 : -1); } } const evalPos = this.evalPosition(); res = (oppCol == "w" ? Math.max(res, evalPos) : Math.min(res, evalPos)); - this.turn = oppCol; this.undo(m); } return res; @@ -277,7 +280,6 @@ class MarseilleRules extends ChessRules // Rank moves using a min-max at depth 2 for (let i=0; i