From: Benjamin Auder Date: Thu, 9 Apr 2020 09:20:48 +0000 (+0200) Subject: Fix Sittuyin promotions X-Git-Url: https://git.auder.net/variants/Chakart/pieces/%3C?a=commitdiff_plain;h=e28faeddfea0ce4416e863d5785e81ae98f13b29;p=vchess.git Fix Sittuyin promotions --- diff --git a/client/src/variants/Sittuyin.js b/client/src/variants/Sittuyin.js index ccdd7b23..0912e701 100644 --- a/client/src/variants/Sittuyin.js +++ b/client/src/variants/Sittuyin.js @@ -166,30 +166,76 @@ export class SittuyinRules extends ChessRules { (color == 'b' && ((y >= 4 && x == y) || (y <= 3 && x == 7 - y))) ) ) { - // Add potential promotions const addPromotion = ([xx, yy], moveTo) => { - moves.push( - new Move({ - appear: [ - new PiPo({ - x: !!moveTo ? xx : x, - y: yy, //yy == y if !!moveTo - c: color, - p: V.QUEEN - }) - ], - vanish: [ - new PiPo({ - x: x, - y: y, - c: color, - p: V.PAWN - }) - ], - start: { x: x, y: y }, - end: { x: xx, y: yy } - }) - ); + // The promoted pawn shouldn't attack anything, + // and the promotion shouldn't discover a rook attack on anything. + const finalSquare = (!moveTo ? [x, y] : [xx, yy]); + let validP = true; + for (let step of V.steps[V.BISHOP]) { + const [i, j] = [finalSquare[0] + step[0], finalSquare[1] + step[1]]; + if ( + V.OnBoard(i, j) && + this.board[i][j] != V.EMPTY && + this.getColor(i, j) != color + ) { + validP = false; + break; + } + } + if (validP && !!moveTo) { + // Also check discovered attacks { n, e, w, s : enemy / my rook --> if both, then it's a discovered attack } + let found = { + "0,-1": 0, + "0,1": 0, + "1,0": 0, + "-1,0": 0 + }; + // TODO: check opposite steps one after another, which could + // save some time (no need to explore the other line). + for (let step of V.steps[V.ROOK]) { + let [i, j] = [x + step[0], y + step[1]]; + while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) { + i += step[0]; + j += step[1]; + } + if (V.OnBoard(i, j)) { + if (this.getColor(i, j) != color) + found[step[0] + "," + step[1]] = -1; //enemy + else if (this.getPiece(i, j) == V.ROOK) + found[step[0] + "," + step[1]] = 1; //my rook + } + } + if ( + (found["0,-1"] * found["0,1"] < 0) || + (found["-1,0"] * found["1,0"] < 0) + ) { + validP = false; + } + } + if (validP) { + moves.push( + new Move({ + appear: [ + new PiPo({ + x: !!moveTo ? xx : x, + y: yy, //yy == y if !!moveTo + c: color, + p: V.QUEEN + }) + ], + vanish: [ + new PiPo({ + x: x, + y: y, + c: color, + p: V.PAWN + }) + ], + start: { x: x, y: y }, + end: { x: xx, y: yy } + }) + ); + } }; // In-place promotion always possible: addPromotion([x - shiftX, y]);