X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=public%2Fjavascripts%2Fbase_rules.js;h=11de1471fa398a5dc912f8a5fd80d67a01e05702;hb=cd4cad0468612cf00c6e6879554e3cee58d4b1f9;hp=0a5c0e72e5e8d7f6f7e3597a8b4eb913b23be8f5;hpb=dfb4afc10d56715b80f753b1273738bd11a309dd;p=vchess.git

diff --git a/public/javascripts/base_rules.js b/public/javascripts/base_rules.js
index 0a5c0e72..11de1471 100644
--- a/public/javascripts/base_rules.js
+++ b/public/javascripts/base_rules.js
@@ -46,14 +46,14 @@ class ChessRules
 	/////////////////
 	// INITIALIZATION
 
-	// fen = "position flags epSquare movesCount"
+	// fen == "position flags"
 	constructor(fen, moves)
 	{
 		this.moves = moves;
 		// Use fen string to initialize variables, flags and board
-		this.initVariables(fen);
-		this.flags = VariantRules.GetFlags(fen);
 		this.board = VariantRules.GetBoard(fen);
+		this.flags = VariantRules.GetFlags(fen);
+		this.initVariables(fen);
 	}
 
 	initVariables(fen)
@@ -98,14 +98,8 @@ class ChessRules
 				j++;
 			}
 		}
-		let epSq = undefined;
-		if (fenParts[2] != "-")
-		{
-			const digits = fenParts[2].split(","); //3,2 ...
-			epSq = { x:Number.parseInt(digits[0]), y:Number.parseInt(digits[1]) };
-		}
+		const epSq = this.moves.length > 0 ? this.getEpSquare(this.lastMove) : undefined;
 		this.epSquares = [ epSq ];
-		this.movesCount = Number.parseInt(fenParts[3]);
 	}
 
 	// Turn diagram fen into double array ["wb","wp","bk",...]
@@ -158,7 +152,7 @@ class ChessRules
 		return L>0 ? this.moves[L-1] : null;
 	}
 	get turn() {
-		return this.movesCount%2==0 ? 'w' : 'b';
+		return this.moves.length%2==0 ? 'w' : 'b';
 	}
 
 	// Pieces codes
@@ -476,8 +470,8 @@ class ChessRules
 
 	canIplay(color, sq)
 	{
-		return ((color=='w' && this.movesCount%2==0)
-				|| (color=='b' && this.movesCount%2==1))
+		return ((color=='w' && this.moves.length%2==0)
+				|| (color=='b' && this.moves.length%2==1))
 			&& this.getColor(sq[0], sq[1]) == color;
 	}
 
@@ -517,6 +511,32 @@ class ChessRules
 		// No: if happen on last 1/2 move, could lead to forbidden moves, wrong evals
 		return this.filterValid(potentialMoves);
 	}
+	
+	// Stop at the first move found
+	atLeastOneMove(color)
+	{
+		const oppCol = this.getOppCol(color);
+		let [sizeX,sizeY] = VariantRules.size;
+		for (var i=0; i<sizeX; i++)
+		{
+			for (var j=0; j<sizeY; j++)
+			{
+				if (this.board[i][j] != VariantRules.EMPTY && this.getColor(i,j) != oppCol)
+				{
+					const moves = this.getPotentialMovesFrom([i,j]);
+					if (moves.length > 0)
+					{
+						for (let i=0; i<moves.length; i++)
+						{
+							if (this.filterValid([moves[i]]).length > 0)
+								return true;
+						}
+					}
+				}
+			}
+		}
+		return false;
+	}
 
 	// Check if pieces of color 'color' are attacking square x,y
 	isAttacked(sq, color)
@@ -603,6 +623,7 @@ class ChessRules
 		return false;
 	}
 
+	// Is color c under check after move ?
 	underCheck(move, c)
 	{
 		this.play(move);
@@ -611,6 +632,17 @@ class ChessRules
 		return res;
 	}
 
+	// On which squares is color c under check (after move) ?
+	getCheckSquares(move, c)
+	{
+		this.play(move);
+		let res = this.isAttacked(this.kingPos[c], this.getOppCol(c))
+			? [ JSON.parse(JSON.stringify(this.kingPos[c])) ] //need to duplicate!
+			: [ ];
+		this.undo(move);
+		return res;
+	}
+
 	// Apply a move on board
 	static PlayOnBoard(board, move)
 	{
@@ -628,7 +660,7 @@ class ChessRules
 			board[psq.x][psq.y] = psq.c + psq.p;
 	}
 
-	// Before move is played:
+	// Before move is played, update variables + flags
 	updateVariables(move)
 	{
 		const piece = this.getPiece(move.start.x,move.start.y);
@@ -659,34 +691,33 @@ class ChessRules
 		}
 	}
 
-	play(move, ingame)
+	unupdateVariables(move)
 	{
-		// Save flags (for undo)
-		move.flags = JSON.stringify(this.flags); //TODO: less costly
-		this.updateVariables(move);
+		// (Potentially) Reset king position
+		const c = this.getColor(move.start.x,move.start.y);
+		if (this.getPiece(move.start.x,move.start.y) == VariantRules.KING)
+			this.kingPos[c] = [move.start.x, move.start.y];
+	}
 
+	play(move, ingame)
+	{
 		if (!!ingame)
-		{
 			move.notation = this.getNotation(move);
-			this.moves.push(move);
-		}
 
+		// Save flags (for undo)
+		move.flags = JSON.stringify(this.flags); //TODO: less costly?
+		this.updateVariables(move);
+		this.moves.push(move);
 		this.epSquares.push( this.getEpSquare(move) );
 		VariantRules.PlayOnBoard(this.board, move);
-		this.movesCount++;
 	}
 
 	undo(move)
 	{
 		VariantRules.UndoOnBoard(this.board, move);
 		this.epSquares.pop();
-		this.movesCount--;
-
-		// Update king position, and reset stored/computed flags
-		const c = this.getColor(move.start.x,move.start.y);
-		if (this.getPiece(move.start.x,move.start.y) == VariantRules.KING)
-			this.kingPos[c] = [move.start.x, move.start.y];
-
+		this.moves.pop();
+		this.unupdateVariables(move);
 		this.flags = JSON.parse(move.flags);
 	}
 
@@ -709,8 +740,7 @@ class ChessRules
 			}
 		}
 
-		// TODO: not required to generate ALL: just need one (callback ? hook ? ...)
-		if (this.getAllValidMoves(color).length > 0)
+		if (this.atLeastOneMove(color))
 		{
 			// game not over
 			return "*";
@@ -779,14 +809,14 @@ class ChessRules
 		moves1.sort( (a,b) => { return (color=="w" ? 1 : -1) * (b.eval - a.eval); });
 
 		// TODO: show current analyzed move for depth 3, allow stopping eval (return moves1[0])
-//		for (let i=0; i<moves1.length; i++)
-//		{
-//			this.play(moves1[i]);
-//			// 0.1 * oldEval : heuristic to avoid some bad moves (not all...)
-//			moves1[i].eval = 0.1*moves1[i].eval + this.alphabeta(oppCol, color, 2, -1000, 1000);
-//			this.undo(moves1[i]);
-//		}
-//		moves1.sort( (a,b) => { return (color=="w" ? 1 : -1) * (b.eval - a.eval); });
+		for (let i=0; i<moves1.length; i++)
+		{
+			this.play(moves1[i]);
+			// 0.1 * oldEval : heuristic to avoid some bad moves (not all...)
+			moves1[i].eval = 0.1*moves1[i].eval + this.alphabeta(oppCol, color, 2, -1000, 1000);
+			this.undo(moves1[i]);
+		}
+		moves1.sort( (a,b) => { return (color=="w" ? 1 : -1) * (b.eval - a.eval); });
 
 		let candidates = [0]; //indices of candidates moves
 		for (let j=1; j<moves1.length && moves1[j].eval == moves1[0].eval; j++)
@@ -798,8 +828,7 @@ class ChessRules
 
 	alphabeta(color, oppCol, depth, alpha, beta)
   {
-		let moves = this.getAllValidMoves(color);
-		if (moves.length == 0)
+		if (!this.atLeastOneMove(color))
 		{
 			switch (this.checkGameEnd(color))
 			{
@@ -809,6 +838,7 @@ class ChessRules
 		}
 		if (depth == 0)
       return this.evalPosition();
+		const moves = this.getAllValidMoves(color);
     let v = color=="w" ? -1000 : 1000;
 		if (color == "w")
 		{
@@ -909,19 +939,14 @@ class ChessRules
 		let fen = pieces[0].join("") +
 			"/pppppppp/8/8/8/8/PPPPPPPP/" +
 			pieces[1].join("").toUpperCase() +
-			" 1111 - 0"; //flags + enPassant + movesCount
+			" 1111"; //add flags
 		return fen;
 	}
 
 	// Return current fen according to pieces+colors state
 	getFen()
 	{
-		const L = this.epSquares.length;
-		const epSq = this.epSquares[L-1]===undefined
-			? "-"
-			: this.epSquares[L-1].x+","+this.epSquares[L-1].y;
-		return this.getBaseFen() + " " + this.getFlagsFen()
-			+ " " + epSq + " " + this.movesCount;
+		return this.getBaseFen() + " " + this.getFlagsFen();
 	}
 
 	getBaseFen()
@@ -1012,7 +1037,7 @@ class ChessRules
 	}
 
 	// The score is already computed when calling this function
-	getPGN(mycolor, score)
+	getPGN(mycolor, score, fenStart)
 	{
 		let pgn = "";
 		pgn += '[Site "vchess.club"]<br>';
@@ -1020,7 +1045,8 @@ class ChessRules
 		pgn += '[Date "' + d.getFullYear() + '-' + d.getMonth() + '-' + d.getDate() + '"]<br>';
 		pgn += '[White "' + (mycolor=='w'?'Myself':'Anonymous') + '"]<br>';
 		pgn += '[Black "' + (mycolor=='b'?'Myself':'Anonymous') + '"]<br>';
-		pgn += '[Result "' + score + '"]<br>';
+		pgn += '[Fen "' + fenStart + '"]<br>';
+		pgn += '[Result "' + score + '"]<br><br>';
 
 		for (let i=0; i<this.moves.length; i++)
 		{