X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=public%2Fjavascripts%2Fbase_rules.js;h=71695c49336fac471d71db083aeca76843a69b1f;hb=97fc8bf769610b26d5edca92905f30af2e4b9633;hp=360f60c53487bb49210ad5ad2d406593d93e7505;hpb=1221ac47836806efb287b0323b92957d9129c653;p=vchess.git

diff --git a/public/javascripts/base_rules.js b/public/javascripts/base_rules.js
index 360f60c5..71695c49 100644
--- a/public/javascripts/base_rules.js
+++ b/public/javascripts/base_rules.js
@@ -124,7 +124,7 @@ class ChessRules
 		return board;
 	}
 
-	// Overridable: flags can change a lot
+	// Extract (relevant) flags from fen
 	setFlags(fen)
 	{
 		// white a-castle, h-castle, black a-castle, h-castle
@@ -137,7 +137,6 @@ class ChessRules
 	///////////////////
 	// GETTERS, SETTERS
 
-	// Simple useful getters
 	static get size() { return [8,8]; }
 	// Two next functions return 'undefined' if called on empty square
 	getColor(i,j) { return this.board[i][j].charAt(0); }
@@ -199,7 +198,7 @@ class ChessRules
 		return undefined; //default
 	}
 
-	// can thing on square1 take thing on square2
+	// Can thing on square1 take thing on square2
 	canTake([x1,y1], [x2,y2])
 	{
 		return this.getColor(x1,y1) != this.getColor(x2,y2);
@@ -291,7 +290,7 @@ class ChessRules
 		return moves;
 	}
 
-	// What are the pawn moves from square x,y considering color "color" ?
+	// What are the pawn moves from square x,y ?
 	getPotentialPawnMoves([x,y])
 	{
 		const color = this.turn;
@@ -332,21 +331,22 @@ class ChessRules
 		if (x+shift == lastRank)
 		{
 			// Promotion
+			const pawnColor = this.getColor(x,y); //can be different for checkered
 			let promotionPieces = [V.ROOK,V.KNIGHT,V.BISHOP,V.QUEEN];
 			promotionPieces.forEach(p => {
 				// Normal move
 				if (this.board[x+shift][y] == V.EMPTY)
-					moves.push(this.getBasicMove([x,y], [x+shift,y], {c:color,p:p}));
+					moves.push(this.getBasicMove([x,y], [x+shift,y], {c:pawnColor,p:p}));
 				// Captures
 				if (y>0 && this.canTake([x,y], [x+shift,y-1])
 					&& this.board[x+shift][y-1] != V.EMPTY)
 				{
-					moves.push(this.getBasicMove([x,y], [x+shift,y-1], {c:color,p:p}));
+					moves.push(this.getBasicMove([x,y], [x+shift,y-1], {c:pawnColor,p:p}));
 				}
 				if (y<sizeY-1 && this.canTake([x,y], [x+shift,y+1])
 					&& this.board[x+shift][y+1] != V.EMPTY)
 				{
-					moves.push(this.getBasicMove([x,y], [x+shift,y+1], {c:color,p:p}));
+					moves.push(this.getBasicMove([x,y], [x+shift,y+1], {c:pawnColor,p:p}));
 				}
 			});
 		}
@@ -546,7 +546,7 @@ class ChessRules
 		return false;
 	}
 
-	// Check if pieces of color 'colors' are attacking square x,y
+	// Check if pieces of color in array 'colors' are attacking square x,y
 	isAttacked(sq, colors)
 	{
 		return (this.isAttackedByPawn(sq, colors)
@@ -557,7 +557,7 @@ class ChessRules
 			|| this.isAttackedByKing(sq, colors));
 	}
 
-	// Is square x,y attacked by pawns of color c ?
+	// Is square x,y attacked by 'colors' pawns ?
 	isAttackedByPawn([x,y], colors)
 	{
 		const [sizeX,sizeY] = VariantRules.size;
@@ -579,28 +579,28 @@ class ChessRules
 		return false;
 	}
 
-	// Is square x,y attacked by rooks of color c ?
+	// Is square x,y attacked by 'colors' rooks ?
 	isAttackedByRook(sq, colors)
 	{
 		return this.isAttackedBySlideNJump(sq, colors,
 			VariantRules.ROOK, VariantRules.steps[VariantRules.ROOK]);
 	}
 
-	// Is square x,y attacked by knights of color c ?
+	// Is square x,y attacked by 'colors' knights ?
 	isAttackedByKnight(sq, colors)
 	{
 		return this.isAttackedBySlideNJump(sq, colors,
 			VariantRules.KNIGHT, VariantRules.steps[VariantRules.KNIGHT], "oneStep");
 	}
 
-	// Is square x,y attacked by bishops of color c ?
+	// Is square x,y attacked by 'colors' bishops ?
 	isAttackedByBishop(sq, colors)
 	{
 		return this.isAttackedBySlideNJump(sq, colors,
 			VariantRules.BISHOP, VariantRules.steps[VariantRules.BISHOP]);
 	}
 
-	// Is square x,y attacked by queens of color c ?
+	// Is square x,y attacked by 'colors' queens ?
 	isAttackedByQueen(sq, colors)
 	{
 		const V = VariantRules;
@@ -608,7 +608,7 @@ class ChessRules
 			V.steps[V.ROOK].concat(V.steps[V.BISHOP]));
 	}
 
-	// Is square x,y attacked by king of color c ?
+	// Is square x,y attacked by 'colors' king(s) ?
 	isAttackedByKing(sq, colors)
 	{
 		const V = VariantRules;
@@ -617,7 +617,7 @@ class ChessRules
 	}
 
 	// Generic method for non-pawn pieces ("sliding or jumping"):
-	// is x,y attacked by piece !of color in colors?
+	// is x,y attacked by a piece of color in array 'colors' ?
 	isAttackedBySlideNJump([x,y], colors, piece, steps, oneStep)
 	{
 		const [sizeX,sizeY] = VariantRules.size;
@@ -640,7 +640,7 @@ class ChessRules
 		return false;
 	}
 
-	// Is color c under check after move ?
+	// Is current player under check after his move ?
 	underCheck(move)
 	{
 		const color = this.turn;
@@ -650,7 +650,7 @@ class ChessRules
 		return res;
 	}
 
-	// On which squares is color c under check (after move) ?
+	// On which squares is opponent under check after our move ?
 	getCheckSquares(move)
 	{
 		this.play(move);
@@ -711,6 +711,8 @@ class ChessRules
 		}
 	}
 
+	// After move is undo-ed, un-update variables (flags are reset)
+	// TODO: more symmetry, by storing flags increment in move...
 	unupdateVariables(move)
 	{
 		// (Potentially) Reset king position
@@ -721,12 +723,8 @@ class ChessRules
 
 	play(move, ingame)
 	{
-		// DEBUG:
-//		if (!this.states) this.states = [];
-//		if (!ingame) this.states.push(JSON.stringify(this.board));
-
 		if (!!ingame)
-			move.notation = this.getNotation(move);
+			move.notation = [this.getNotation(move), this.getLongNotation(move)];
 
 		move.flags = JSON.stringify(this.flags); //save flags (for undo)
 		this.updateVariables(move);
@@ -742,22 +740,16 @@ class ChessRules
 		this.moves.pop();
 		this.unupdateVariables(move);
 		this.parseFlags(JSON.parse(move.flags));
-
-		// DEBUG:
-//		let state = this.states.pop();
-//		if (JSON.stringify(this.board) != state)
-//			debugger;
 	}
 
 	//////////////
 	// END OF GAME
 
+	// Basic check for 3 repetitions (in the last moves only)
 	checkRepetition()
 	{
-		// Check for 3 repetitions
 		if (this.moves.length >= 8)
 		{
-			// NOTE: crude detection, only moves repetition
 			const L = this.moves.length;
 			if (_.isEqual(this.moves[L-1], this.moves[L-5]) &&
 				_.isEqual(this.moves[L-2], this.moves[L-6]) &&
@@ -770,6 +762,7 @@ class ChessRules
 		return false;
 	}
 
+	// Is game over ? And if yes, what is the score ?
 	checkGameOver()
 	{
 		if (this.checkRepetition())
@@ -844,27 +837,41 @@ class ChessRules
 		for (let i=0; i<moves1.length; i++)
 		{
 			moves1[i].eval = (color=="w" ? -1 : 1) * maxeval; //very low, I'm checkmated
-			let eval2 = (color=="w" ? 1 : -1) * maxeval; //initialized with checkmate value
 			this.play(moves1[i]);
-			// Second half-move:
-			let moves2 = this.getAllValidMoves();
-			// If no possible moves AND underCheck, eval2 is correct.
-			// If !underCheck, eval2 is 0 (stalemate).
-			if (moves2.length == 0 && this.checkGameEnd() == "1/2")
-				eval2 = 0;
-			for (let j=0; j<moves2.length; j++)
+			let eval2 = undefined;
+			if (this.atLeastOneMove())
+			{
+				eval2 = (color=="w" ? 1 : -1) * maxeval; //initialized with checkmate value
+				// Second half-move:
+				let moves2 = this.getAllValidMoves();
+				for (let j=0; j<moves2.length; j++)
+				{
+					this.play(moves2[j]);
+					let evalPos = undefined;
+					if (this.atLeastOneMove())
+						evalPos = this.evalPosition()
+					else
+					{
+						// Work with scores for Loser variant
+						const score = this.checkGameEnd();
+						evalPos = (score=="1/2" ? 0 : (score=="1-0" ? 1 : -1) * maxeval);
+					}
+					if ((color == "w" && evalPos < eval2) || (color=="b" && evalPos > eval2))
+						eval2 = evalPos;
+					this.undo(moves2[j]);
+				}
+			}
+			else
 			{
-				this.play(moves2[j]);
-				let evalPos = this.evalPosition();
-				if ((color == "w" && evalPos < eval2) || (color=="b" && evalPos > eval2))
-					eval2 = evalPos;
-				this.undo(moves2[j]);
+				const score = this.checkGameEnd();
+				eval2 = (score=="1/2" ? 0 : (score=="1-0" ? 1 : -1) * maxeval);
 			}
 			if ((color=="w" && eval2 > moves1[i].eval) || (color=="b" && eval2 < moves1[i].eval))
 				moves1[i].eval = eval2;
 			this.undo(moves1[i]);
 		}
 		moves1.sort( (a,b) => { return (color=="w" ? 1 : -1) * (b.eval - a.eval); });
+		//console.log(moves1.map(m => { return [this.getNotation(m), m.eval]; }));
 
 		let candidates = [0]; //indices of candidates moves
 		for (let j=1; j<moves1.length && moves1[j].eval == moves1[0].eval; j++)
@@ -889,11 +896,11 @@ class ChessRules
 		}
 		else
 			return currentBest;
+		//console.log(moves1.map(m => { return [this.getNotation(m), m.eval]; }));
 
 		candidates = [0];
 		for (let j=1; j<moves1.length && moves1[j].eval == moves1[0].eval; j++)
 			candidates.push(j);
-//		console.log(moves1.map(m => { return [this.getNotation(m), m.eval]; }));
 		return moves1[_.sample(candidates, 1)];
 	}
 
@@ -905,8 +912,11 @@ class ChessRules
 		{
 			switch (this.checkGameEnd())
 			{
-				case "1/2": return 0;
-				default: return color=="w" ? -maxeval : maxeval;
+				case "1/2":
+					return 0;
+				default:
+					const score = this.checkGameEnd();
+					return (score=="1/2" ? 0 : (score=="1-0" ? 1 : -1) * maxeval);
 			}
 		}
 		if (depth == 0)
@@ -962,7 +972,7 @@ class ChessRules
 	////////////
 	// FEN utils
 
-	// Overridable..
+	// Setup the initial random (assymetric) position
 	static GenRandInitFen()
 	{
 		let pieces = [new Array(8), new Array(8)];
@@ -1022,6 +1032,7 @@ class ChessRules
 		return this.getBaseFen() + " " + this.getFlagsFen();
 	}
 
+	// Position part of the FEN string
 	getBaseFen()
 	{
 		let fen = "";
@@ -1055,7 +1066,7 @@ class ChessRules
 		return fen;
 	}
 
-	// Overridable..
+	// Flags part of the FEN string
 	getFlagsFen()
 	{
 		let fen = "";
@@ -1110,6 +1121,16 @@ class ChessRules
 		}
 	}
 
+	// Complete the usual notation, may be required for de-ambiguification
+	getLongNotation(move)
+	{
+		const startSquare =
+			String.fromCharCode(97 + move.start.y) + (VariantRules.size[0]-move.start.x);
+		const finalSquare =
+			String.fromCharCode(97 + move.end.y) + (VariantRules.size[0]-move.end.x);
+		return startSquare + finalSquare; //not encoding move. But short+long is enough
+	}
+
 	// The score is already computed when calling this function
 	getPGN(mycolor, score, fenStart, mode)
 	{
@@ -1121,17 +1142,27 @@ class ChessRules
 		pgn += '[Date "' + d.getFullYear() + '-' + (d.getMonth()+1) + '-' + d.getDate() + '"]<br>';
 		pgn += '[White "' + (mycolor=='w'?'Myself':opponent) + '"]<br>';
 		pgn += '[Black "' + (mycolor=='b'?'Myself':opponent) + '"]<br>';
-		pgn += '[Fen "' + fenStart + '"]<br>';
+		pgn += '[FenStart "' + fenStart + '"]<br>';
+		pgn += '[Fen "' + this.getFen() + '"]<br>';
 		pgn += '[Result "' + score + '"]<br><br>';
 
+		// Standard PGN
+		for (let i=0; i<this.moves.length; i++)
+		{
+			if (i % 2 == 0)
+				pgn += ((i/2)+1) + ".";
+			pgn += this.moves[i].notation[0] + " ";
+		}
+		pgn += "<br><br>";
+
+		// "Complete moves" PGN (helping in ambiguous cases)
 		for (let i=0; i<this.moves.length; i++)
 		{
 			if (i % 2 == 0)
 				pgn += ((i/2)+1) + ".";
-			pgn += this.moves[i].notation + " ";
+			pgn += this.moves[i].notation[1] + " ";
 		}
 
-		pgn += score;
 		return pgn;
 	}
 }