X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=public%2Fjavascripts%2Fbase_rules.js;h=11de1471fa398a5dc912f8a5fd80d67a01e05702;hb=cd4cad0468612cf00c6e6879554e3cee58d4b1f9;hp=b604e7970ffc357c4b05b0217836756485bde3c6;hpb=4b5fe3061829e184f9ad86a13d831eda22d95343;p=vchess.git

diff --git a/public/javascripts/base_rules.js b/public/javascripts/base_rules.js
index b604e797..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;
 	}
 
@@ -666,7 +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);
@@ -697,37 +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, ingame)
+	undo(move)
 	{
 		VariantRules.UndoOnBoard(this.board, move);
 		this.epSquares.pop();
-		this.movesCount--;
-
-		if (!!ingame)
-			this.moves.pop();
-
-		// 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);
 	}
 
@@ -838,8 +828,7 @@ class ChessRules
 
 	alphabeta(color, oppCol, depth, alpha, beta)
   {
-		const moves = this.getAllValidMoves(color);
-		if (moves.length == 0)
+		if (!this.atLeastOneMove(color))
 		{
 			switch (this.checkGameEnd(color))
 			{
@@ -849,6 +838,7 @@ class ChessRules
 		}
 		if (depth == 0)
       return this.evalPosition();
+		const moves = this.getAllValidMoves(color);
     let v = color=="w" ? -1000 : 1000;
 		if (color == "w")
 		{
@@ -949,19 +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()