X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=public%2Fjavascripts%2Fvariants%2FUltima.js;h=04d62b7d016a992083fdfa86af0d890fd6ae4fbb;hb=643479f8d7c3622b57fc49c4f10d9950793ebf4f;hp=57f3e25c6e8cd6fbabfafe7ccc224fde1c1e3c8b;hpb=2f3c845159670ec8bfba8a3999571d6ee1e45320;p=vchess.git

diff --git a/public/javascripts/variants/Ultima.js b/public/javascripts/variants/Ultima.js
index 57f3e25c..04d62b7d 100644
--- a/public/javascripts/variants/Ultima.js
+++ b/public/javascripts/variants/Ultima.js
@@ -1,5 +1,9 @@
 class UltimaRules extends ChessRules
 {
+	static get HasFlags() { return false; }
+
+	static get HasEnpassant() { return false; }
+
 	static getPpath(b)
 	{
 		if (b[1] == "m") //'m' for Immobilizer (I is too similar to 1)
@@ -7,7 +11,13 @@ class UltimaRules extends ChessRules
 		return b; //usual piece
 	}
 
-	initVariables(fen)
+	static get PIECES()
+	{
+		return ChessRules.PIECES.concat([V.IMMOBILIZER]);
+	}
+
+	// No castling, but checks, so keep track of kings
+	setOtherVariables(fen)
 	{
 		this.kingPos = {'w':[-1,-1], 'b':[-1,-1]};
 		const fenParts = fen.split(" ");
@@ -33,13 +43,6 @@ class UltimaRules extends ChessRules
 				k++;
 			}
 		}
-		this.epSquares = []; //no en-passant here
-	}
-
-	setFlags(fen)
-	{
-		// TODO: for compatibility?
-		this.castleFlags = {"w":[false,false], "b":[false,false]};
 	}
 
 	static get IMMOBILIZER() { return 'm'; }
@@ -53,70 +56,41 @@ class UltimaRules extends ChessRules
 	// Is piece on square (x,y) immobilized?
 	isImmobilized([x,y])
 	{
-					// Final check: is this knight immobilized?
-					let foundImmobilizer = false;
-					let neutralized = false;
-					outerLoop:
-					for (let step of steps)
-					{
-						const [i2,j2] = [i+step[0],j+step[1]];
-						if (i2>=0 && i2<sizeX && j2>=0 && j2<sizeY
-							&& this.board[i2][j2] != V.EMPTY
-							&& this.getColor(i2,j2) == oppCol
-							&& this.getPiece(i2,j2) == V.IMMOBILIZER)
-						{
-							foundImmobilizer = true;
-							// Moving is possible only if this immobilizer is neutralized
-							for (let step2 of steps)
-							{
-								const [i3,j3] = [i2+step2[0],j2+step2[1]];
-								if (i3>=0 && i3<sizeX && j3>=0 && j3<sizeY
-									&& this.board[i3][j3] != V.EMPTY && this.getColor(i3,j3) == color
-									&& [V.BISHOP,V.IMMOBILIZER].includes(this.getPiece(i3,j3)))
-								{
-									neutralized = true;
-									break outerLoop;
-								}
-							}
-						}
-					}
-					if (!foundImmobilizer || neutralized)
-						return false;
-		
 		const piece = this.getPiece(x,y);
 		const color = this.getColor(x,y);
 		const oppCol = this.getOppCol(color);
-		const V = VariantRules;
 		const adjacentSteps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
-		const [sizeX,sizeY] = V.size;
 		outerLoop:
 		for (let step of adjacentSteps)
 		{
 			const [i,j] = [x+step[0],y+step[1]];
-			if (i>=0 && i<sizeX && j>=0 && j<sizeY && this.board[i][j] != V.EMPTY
+			if (V.OnBoard(i,j) && this.board[i][j] != V.EMPTY
 				&& this.getColor(i,j) == oppCol)
 			{
 				const oppPiece = this.getPiece(i,j);
-				if (oppPiece == V.BISHOP && piece == V.IMMOBILIZER)
-					return [];
-				if (oppPiece == V.IMMOBILIZER && ![V.BISHOP,V.IMMOBILIZER].includes(piece))
+				if (oppPiece == V.IMMOBILIZER)
 				{
 					// Moving is impossible only if this immobilizer is not neutralized
 					for (let step2 of adjacentSteps)
 					{
 						const [i2,j2] = [i+step2[0],j+step2[1]];
-						if (i2>=0 && i2<sizeX && j2>=0 && j2<sizeY
-							&& this.board[i2][j2] != V.EMPTY && this.getColor(i2,j2) == color)
+						if (i2 == x && j2 == y)
+							continue; //skip initial piece!
+						if (V.OnBoard(i2,j2) && this.board[i2][j2] != V.EMPTY
+							&& this.getColor(i2,j2) == color)
 						{
-							const friendlyPiece = this.getPiece(i2,j2);
-							if ([V.BISHOP,V.IMMOBILIZER].includes(friendlyPiece))
-								break outerLoop;
+							if ([V.BISHOP,V.IMMOBILIZER].includes(this.getPiece(i2,j2)))
+								return false;
 						}
 					}
-					return []; //immobilizer isn't neutralized
+					return true; //immobilizer isn't neutralized
 				}
+				// Chameleons can't be immobilized twice, because there is only one immobilizer
+				if (oppPiece == V.BISHOP && piece == V.IMMOBILIZER)
+					return true;
 			}
 		}
+		return false;
 	}
 
 	getPotentialMovesFrom([x,y])
@@ -126,7 +100,7 @@ class UltimaRules extends ChessRules
 			return [];
 		switch (this.getPiece(x,y))
 		{
-			case VariantRules.IMMOBILIZER:
+			case V.IMMOBILIZER:
 				return this.getPotentialImmobilizerMoves([x,y]);
 			default:
 				return super.getPotentialMovesFrom([x,y]);
@@ -138,14 +112,12 @@ class UltimaRules extends ChessRules
 		const color = this.getColor(x,y);
 		const piece = this.getPiece(x,y);
 		let moves = [];
-		const [sizeX,sizeY] = VariantRules.size;
 		outerLoop:
 		for (let step of steps)
 		{
 			let i = x + step[0];
 			let j = y + step[1];
-			while (i>=0 && i<sizeX && j>=0 && j<sizeY
-				&& this.board[i][j] == VariantRules.EMPTY)
+			while (V.OnBoard(i,j) && this.board[i][j] == V.EMPTY)
 			{
 				moves.push(this.getBasicMove([x,y], [i,j]));
 				if (oneStep !== undefined)
@@ -154,11 +126,8 @@ class UltimaRules extends ChessRules
 				j += step[1];
 			}
 			// Only king can take on occupied square:
-			if (piece==VariantRules.KING && i>=0 && i<sizeX && j>=0
-				&& j<sizeY && this.canTake([x,y], [i,j]))
-			{
+			if (piece==V.KING && V.OnBoard(i,j) && this.canTake([x,y], [i,j]))
 				moves.push(this.getBasicMove([x,y], [i,j]));
-			}
 		}
 		return moves;
 	}
@@ -166,8 +135,7 @@ class UltimaRules extends ChessRules
 	// Modify capturing moves among listed pawn moves
 	addPawnCaptures(moves, byChameleon)
 	{
-		const steps = VariantRules.steps[VariantRules.ROOK];
-		const [sizeX,sizeY] = VariantRules.size;
+		const steps = V.steps[V.ROOK];
 		const color = this.turn;
 		const oppCol = this.getOppCol(color);
 		moves.forEach(m => {
@@ -177,17 +145,16 @@ class UltimaRules extends ChessRules
 			for (let step of steps)
 			{
 				const sq2 = [m.end.x+2*step[0],m.end.y+2*step[1]];
-				if (sq2[0]>=0 && sq2[0]<sizeX && sq2[1]>=0 && sq2[1]<sizeY
-					&& this.board[sq2[0]][sq2[1]] != VariantRules.EMPTY
+				if (V.OnBoard(sq2[0],sq2[1]) && this.board[sq2[0]][sq2[1]] != V.EMPTY
 					&& this.getColor(sq2[0],sq2[1]) == color)
 				{
 					// Potential capture
 					const sq1 = [m.end.x+step[0],m.end.y+step[1]];
-					if (this.board[sq1[0]][sq1[1]] != VariantRules.EMPTY
+					if (this.board[sq1[0]][sq1[1]] != V.EMPTY
 						&& this.getColor(sq1[0],sq1[1]) == oppCol)
 					{
 						const piece1 = this.getPiece(sq1[0],sq1[1]);
-						if (!byChameleon || piece1 == VariantRules.PAWN)
+						if (!byChameleon || piece1 == V.PAWN)
 						{
 							m.vanish.push(new PiPo({
 								x:sq1[0],
@@ -219,14 +186,14 @@ class UltimaRules extends ChessRules
 			// Check piece-king rectangle (if any) corners for enemy pieces
 			if (m.end.x == kp[0] || m.end.y == kp[1])
 				return; //"flat rectangle"
-			const corner1 = [Math.max(m.end.x,kp[0]), Math.min(m.end.y,kp[1])];
-			const corner2 = [Math.min(m.end.x,kp[0]), Math.max(m.end.y,kp[1])];
+			const corner1 = [m.end.x, kp[1]];
+			const corner2 = [kp[0], m.end.y];
 			for (let [i,j] of [corner1,corner2])
 			{
-				if (this.board[i][j] != VariantRules.EMPTY && this.getColor(i,j) == oppCol)
+				if (this.board[i][j] != V.EMPTY && this.getColor(i,j) == oppCol)
 				{
 					const piece = this.getPiece(i,j);
-					if (!byChameleon || piece == VariantRules.ROOK)
+					if (!byChameleon || piece == V.ROOK)
 					{
 						m.vanish.push( new PiPo({
 							x:i,
@@ -252,9 +219,7 @@ class UltimaRules extends ChessRules
 	getKnightCaptures(startSquare, byChameleon)
 	{
 		// Look in every direction for captures
-		const V = VariantRules;
 		const steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
-		const [sizeX,sizeY] = V.size;
 		const color = this.turn;
 		const oppCol = this.getOppCol(color);
 		let moves = [];
@@ -264,12 +229,12 @@ class UltimaRules extends ChessRules
 		for (let step of steps)
 		{
 			let [i,j] = [x+step[0], y+step[1]];
-			while (i>=0 && i<sizeX && j>=0 && j<sizeY && this.board[i][j]==V.EMPTY)
+			while (V.OnBoard(i,j) && this.board[i][j]==V.EMPTY)
 			{
 				i += step[0];
 				j += step[1];
 			}
-			if (i<0 || i>=sizeX || j<0 || j>=sizeY || this.getColor(i,j)==color
+			if (!V.OnBoard(i,j) || this.getColor(i,j)==color
 				|| (!!byChameleon && this.getPiece(i,j)!=V.KNIGHT))
 			{
 				continue;
@@ -281,7 +246,7 @@ class UltimaRules extends ChessRules
 			let last = [i,j];
 			let cur = [i+step[0],j+step[1]];
 			let vanished = [ new PiPo({x:x,y:y,c:color,p:piece}) ];
-			while (cur[0]>=0 && cur[0]<sizeX && cur[1]>=0 && cur[1]<sizeY)
+			while (V.OnBoard(cur[0],cur[1]))
 			{
 				if (this.board[last[0]][last[1]] != V.EMPTY)
 				{
@@ -331,9 +296,8 @@ class UltimaRules extends ChessRules
 		this.addQueenCaptures(moves, "asChameleon");
 		// Post-processing: merge similar moves, concatenating vanish arrays
 		let mergedMoves = {};
-		const [sizeX,sizeY] = VariantRules.size;
 		moves.forEach(m => {
-			const key = m.end.x + sizeX * m.end.y;
+			const key = m.end.x + V.size.x * m.end.y;
 			if (!mergedMoves[key])
 				mergedMoves[key] = m;
 			else
@@ -354,16 +318,13 @@ class UltimaRules extends ChessRules
 		if (moves.length == 0)
 			return;
 		const [x,y] = [moves[0].start.x,moves[0].start.y];
-		const V = VariantRules;
 		const adjacentSteps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
 		let capturingDirections = [];
 		const color = this.turn;
 		const oppCol = this.getOppCol(color);
-		const [sizeX,sizeY] = V.size;
 		adjacentSteps.forEach(step => {
 			const [i,j] = [x+step[0],y+step[1]];
-			if (i>=0 && i<sizeX && j>=0 && j<sizeY
-				&& this.board[i][j] != V.EMPTY && this.getColor(i,j) == oppCol
+			if (V.OnBoard(i,j) && this.board[i][j] != V.EMPTY && this.getColor(i,j) == oppCol
 				&& (!byChameleon || this.getPiece(i,j) == V.QUEEN))
 			{
 				capturingDirections.push(step);
@@ -405,66 +366,80 @@ class UltimaRules extends ChessRules
 
 	getPotentialKingMoves(sq)
 	{
-		const V = VariantRules;
 		return this.getSlideNJumpMoves(sq,
 			V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep");
 	}
 
 	// isAttacked() is OK because the immobilizer doesn't take
 
-	// TODO: check if any pawn can reach capturing square + !immobilized
 	isAttackedByPawn([x,y], colors)
 	{
-		// Square (x,y) must be surrounded by two enemy pieces,
-		// and one of them at least should be a pawn.
-		const dirs = [ [1,0],[0,1],[1,1],[-1,1] ];
-		const [sizeX,sizeY] = VariantRules.size;
+		// Square (x,y) must be surroundable by two enemy pieces,
+		// and one of them at least should be a pawn (moving).
+		const dirs = [ [1,0],[0,1] ];
+		const steps = V.steps[V.ROOK];
 		for (let dir of dirs)
 		{
 			const [i1,j1] = [x-dir[0],y-dir[1]]; //"before"
 			const [i2,j2] = [x+dir[0],y+dir[1]]; //"after"
-			if (i1>=0 && i1<sizeX && i2>=0 && i2<sizeX
-				&& j1>=0 && j1<sizeY && j2>=0 && j2<sizeY
-				&& this.board[i1][j1]!=VariantRules.EMPTY
-				&& this.board[i2][j2]!=VariantRules.EMPTY
-				&& colors.includes(this.getColor(i1,j1))
-				&& colors.includes(this.getColor(i2,j2))
-				&& [this.getPiece(i1,j1),this.getPiece(i2,j2)].includes(VariantRules.PAWN))
+			if (V.OnBoard(i1,j1) && V.OnBoard(i2,j2))
 			{
-				return true;
+				if ((this.board[i1][j1]!=V.EMPTY && colors.includes(this.getColor(i1,j1))
+					&& this.board[i2][j2]==V.EMPTY)
+						||
+					(this.board[i2][j2]!=V.EMPTY && colors.includes(this.getColor(i2,j2))
+					&& this.board[i1][j1]==V.EMPTY))
+				{
+					// Search a movable enemy pawn landing on the empty square
+					for (let step of steps)
+					{
+						let [ii,jj] = (this.board[i1][j1]==V.EMPTY ? [i1,j1] : [i2,j2]);
+						let [i3,j3] = [ii+step[0],jj+step[1]];
+						while (V.OnBoard(i3,j3) && this.board[i3][j3]==V.EMPTY)
+						{
+							i3 += step[0];
+							j3 += step[1];
+						}
+						if (V.OnBoard(i3,j3) && colors.includes(this.getColor(i3,j3))
+							&& this.getPiece(i3,j3) == V.PAWN && !this.isImmobilized([i3,j3]))
+						{
+							return true;
+						}
+					}
+				}
 			}
 		}
 		return false;
 	}
 
-	// TODO: check if enemy's rook can reach capturing squares + !immobilized
 	isAttackedByRook([x,y], colors)
 	{
-		const [sizeX,sizeY] = VariantRules.size;
-		// King must be on same column and a rook on same row (or reverse)
-		if (x == this.kingPos[colors[0]][0]) //using colors[0], only element in this case
+		// King must be on same column or row,
+		// and a rook should be able to reach a capturing square
+		// colors contains only one element, giving the oppCol and thus king position
+		const sameRow = (x == this.kingPos[colors[0]][0]);
+		const sameColumn = (y == this.kingPos[colors[0]][1]);
+		if (sameRow || sameColumn)
 		{
-			// Look for enemy rook on this column
-			for (let i=0; i<sizeY; i++)
+			// Look for the enemy rook (maximum 1)
+			for (let i=0; i<V.size.x; i++)
 			{
-				if (this.board[x][i] != VariantRules.EMPTY
-					&& colors.includes(this.getColor(x,i))
-					&& this.getPiece(x,i) == VariantRules.ROOK)
+				for (let j=0; j<V.size.y; j++)
 				{
-					return true;
-				}
-			}
-		}
-		else if (y == this.kingPos[colors[0]][1])
-		{
-			// Look for enemy rook on this row
-			for (let i=0; i<sizeX; i++)
-			{
-				if (this.board[i][y] != VariantRules.EMPTY
-					&& colors.includes(this.getColor(i,y))
-					&& this.getPiece(i,y) == VariantRules.ROOK)
-				{
-					return true;
+					if (this.board[i][j] != V.EMPTY && colors.includes(this.getColor(i,j))
+						&& this.getPiece(i,j) == V.ROOK)
+					{
+						if (this.isImmobilized([i,j]))
+							return false; //because only one rook
+						// Can it reach a capturing square?
+						// Easy but quite suboptimal way (TODO): generate all moves (turn is OK)
+						const moves = this.getPotentialMovesFrom([i,j]);
+						for (let move of moves)
+						{
+							if (sameRow && move.end.y == y || sameColumn && move.end.x == x)
+								return true;
+						}
+					}
 				}
 			}
 		}
@@ -475,27 +450,36 @@ class UltimaRules extends ChessRules
 	{
 		// Square (x,y) must be on same line as a knight,
 		// and there must be empty square(s) behind.
-		const V = VariantRules;
 		const steps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
-		const [sizeX,sizeY] = V.size;
 		outerLoop:
 		for (let step of steps)
 		{
 			const [i0,j0] = [x+step[0],y+step[1]];
-			if (i0>=0 && i0<sizeX && j0>=0 && j0<sizeY && this.board[i0][j0] == V.EMPTY)
+			if (V.OnBoard(i0,j0) && this.board[i0][j0] == V.EMPTY)
 			{
 				// Try in opposite direction:
 				let [i,j] = [x-step[0],y-step[1]];
-				while (i>=0 && i<sizeX && j>=0 && j<sizeY && this.board[i][j] == V.EMPTY)
-				{
-					i -= step[0];
-					j -= step[1];
-				}
-				if (i>=0 && i<sizeX && j>=0 && j<sizeY && colors.includes(this.getColor(i,j))
-					&& this.getPiece(i,j) == V.KNIGHT)
+				while (V.OnBoard(i,j))
 				{
-					if (!this.isImmobilized([i,j]))
-						return true;
+					while (V.OnBoard(i,j) && this.board[i][j] == V.EMPTY)
+					{
+						i -= step[0];
+						j -= step[1];
+					}
+					if (V.OnBoard(i,j))
+					{
+						if (colors.includes(this.getColor(i,j)))
+						{
+							if (this.getPiece(i,j) == V.KNIGHT && !this.isImmobilized([i,j]))
+								return true;
+							continue outerLoop;
+						}
+						// [else] Our color, could be captured *if there was an empty space*
+						if (this.board[i+step[0]][j+step[1]] != V.EMPTY)
+							continue outerLoop;
+						i -= step[0];
+						j -= step[1];
+					}
 				}
 			}
 		}
@@ -506,13 +490,11 @@ class UltimaRules extends ChessRules
 	{
 		// We cheat a little here: since this function is used exclusively for king,
 		// it's enough to check the immediate surrounding of the square.
-		const V = VariantRules;
 		const adjacentSteps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
-		const [sizeX,sizeY] = V.size;
 		for (let step of adjacentSteps)
 		{
 			const [i,j] = [x+step[0],y+step[1]];
-			if (i>=0 && i<sizeX && j>=0 && j<sizeY && this.board[i][j]!=V.EMPTY
+			if (V.OnBoard(i,j) && this.board[i][j]!=V.EMPTY
 				&& colors.includes(this.getColor(i,j)) && this.getPiece(i,j) == V.BISHOP)
 			{
 				return true; //bishops are never immobilized
@@ -525,14 +507,11 @@ class UltimaRules extends ChessRules
 	{
 		// Square (x,y) must be adjacent to a queen, and the queen must have
 		// some free space in the opposite direction from (x,y)
-		const V = VariantRules;
 		const adjacentSteps = V.steps[V.ROOK].concat(V.steps[V.BISHOP]);
-		const [sizeX,sizeY] = V.size;
 		for (let step of adjacentSteps)
 		{
 			const sq2 = [x+2*step[0],y+2*step[1]];
-			if (sq2[0]>=0 && sq2[0]<sizeX && sq2[1]>=0 && sq2[1]<sizeY
-				&& this.board[sq2[0]][sq2[1]] == V.EMPTY)
+			if (V.OnBoard(sq2[0],sq2[1]) && this.board[sq2[0]][sq2[1]] == V.EMPTY)
 			{
 				const sq1 = [x+step[0],y+step[1]];
 				if (this.board[sq1[0]][sq1[1]] != V.EMPTY
@@ -552,14 +531,16 @@ class UltimaRules extends ChessRules
 		// Just update king(s) position(s)
 		const piece = this.getPiece(move.start.x,move.start.y);
 		const c = this.getColor(move.start.x,move.start.y);
-		if (piece == VariantRules.KING && move.appear.length > 0)
+		if (piece == V.KING && move.appear.length > 0)
 		{
 			this.kingPos[c][0] = move.appear[0].x;
 			this.kingPos[c][1] = move.appear[0].y;
 		}
 	}
 
-	static get VALUES() { //TODO: totally experimental!
+	static get VALUES()
+	{
+		// TODO: totally experimental!
 		return {
 			'p': 1,
 			'r': 2,
@@ -623,11 +604,27 @@ class UltimaRules extends ChessRules
 		return pieces["b"].join("") +
 			"/pppppppp/8/8/8/8/PPPPPPPP/" +
 			pieces["w"].join("").toUpperCase() +
-			" 0000"; //TODO: flags?!
+			" w";
 	}
 
-	getFlagsFen()
+	getNotation(move)
 	{
-		return "0000"; //TODO: or "-" ?
+		const initialSquare = V.CoordsToSquare(move.start);
+		const finalSquare = V.CoordsToSquare(move.end);
+		let notation = undefined;
+		if (move.appear[0].p == V.PAWN)
+		{
+			// Pawn: generally ambiguous short notation, so we use full description
+			notation = "P" + initialSquare + finalSquare;
+		}
+		else if (move.appear[0].p == V.KING)
+			notation = "K" + (move.vanish.length>1 ? "x" : "") + finalSquare;
+		else
+			notation = move.appear[0].p.toUpperCase() + finalSquare;
+		if (move.vanish.length > 1 && move.appear[0].p != V.KING)
+			notation += "X"; //capture mark (not describing what is captured...)
+		return notation;
 	}
 }
+
+const VariantRules = UltimaRules;