/**** 
* Classes
****/ 
var ActionButton = Container.expand(function (text, color, callback) {
	var self = Container.call(this);
	var bg = self.attachAsset(color === 'green' ? 'copyButtonBg' : 'resetButtonBg', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var buttonText = new Text2(text, {
		size: 28,
		fill: 0xFFFFFF
	});
	buttonText.anchor.set(0.5, 0.5);
	buttonText.y = -10;
	self.addChild(buttonText);
	self.callback = callback;
	self.down = function (x, y, obj) {
		if (self.callback) {
			self.callback();
		}
	};
	return self;
});
var ChessSquare = Container.expand(function (isLight, x, y) {
	var self = Container.call(this);
	var square = self.attachAsset(isLight ? 'chessSquareLight' : 'chessSquareDark', {
		anchorX: 0,
		anchorY: 0
	});
	self.squareX = x;
	self.squareY = y;
	self.isLight = isLight;
	self.piece = null;
	self.pieceText = null;
	self.setPiece = function (pieceSymbol) {
		if (self.pieceText) {
			self.removeChild(self.pieceText);
		}
		if (pieceSymbol) {
			self.piece = pieceSymbol;
			self.pieceText = new Text2(pieceSymbol, {
				size: 120,
				fill: 0x000000
			});
			self.pieceText.anchor.set(0.5, 0.5);
			self.pieceText.x = square.width / 2;
			self.pieceText.y = square.height / 2;
			self.addChild(self.pieceText);
		} else {
			self.piece = null;
			self.pieceText = null;
		}
	};
	return self;
});
var GenerateButton = Container.expand(function (callback) {
	var self = Container.call(this);
	var bg = self.attachAsset('buttonBg', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var text = new Text2('Generate New Position', {
		size: 36,
		fill: 0xFFFFFF
	});
	text.anchor.set(0.5, 0.5);
	self.addChild(text);
	self.callback = callback;
	self.down = function (x, y, obj) {
		if (self.callback) {
			self.callback();
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2c3e50
});

/**** 
* Game Code
****/ 
var boardSquares = [];
var currentPosition = '';
var positionText = null;
// Chess piece symbols
var pieceSymbols = {
	'K': '♔',
	// King
	'Q': '♕',
	// Queen
	'R': '♖',
	// Rook
	'B': '♗',
	// Bishop
	'N': '♘' // Knight
};
// Standard Chess960 pieces that need to be placed
var piecesToPlace = ['R', 'N', 'B', 'Q', 'K', 'B', 'N', 'R'];
function initializeBoard() {
	var boardSize = 1600; // 8 squares * 200px each
	var startX = (2048 - boardSize) / 2;
	var startY = 400;
	// Create 2 ranks: 8 and 2 (back rank and pawn rank)
	for (var rank = 0; rank < 2; rank++) {
		// Show ranks 8 and 2
		for (var file = 0; file < 8; file++) {
			var isLight = (rank + file) % 2 === 0;
			var square = new ChessSquare(isLight, file, rank);
			square.x = startX + file * 200;
			square.y = startY + rank * 200;
			game.addChild(square);
			if (rank === 0) {
				// Only store rank 8 squares for piece placement
				boardSquares.push(square);
			}
			// Add pawns to rank 2 (white pawns) only
			if (rank === 1) {
				// Rank 2 - white pawns (one rank in front of pieces)
				square.setPiece('♙');
			}
		}
	}
}
function generateChess960Position() {
	// Clear current pieces
	for (var i = 0; i < boardSquares.length; i++) {
		boardSquares[i].setPiece(null);
	}
	var position = new Array(8);
	var availableSquares = [0, 1, 2, 3, 4, 5, 6, 7];
	// Step 1: Place bishops on opposite colored squares
	var lightSquares = [1, 3, 5, 7]; // Light squares
	var darkSquares = [0, 2, 4, 6]; // Dark squares
	// Place first bishop on light square
	var lightBishopPos = lightSquares[Math.floor(Math.random() * lightSquares.length)];
	position[lightBishopPos] = 'B';
	availableSquares.splice(availableSquares.indexOf(lightBishopPos), 1);
	// Place second bishop on dark square
	var darkBishopPos = darkSquares[Math.floor(Math.random() * darkSquares.length)];
	position[darkBishopPos] = 'B';
	availableSquares.splice(availableSquares.indexOf(darkBishopPos), 1);
	// Step 2: Place queen randomly in remaining squares
	var queenPos = availableSquares[Math.floor(Math.random() * availableSquares.length)];
	position[queenPos] = 'Q';
	availableSquares.splice(availableSquares.indexOf(queenPos), 1);
	// Step 3: Place knights randomly in remaining squares
	var knight1Pos = availableSquares[Math.floor(Math.random() * availableSquares.length)];
	position[knight1Pos] = 'N';
	availableSquares.splice(availableSquares.indexOf(knight1Pos), 1);
	var knight2Pos = availableSquares[Math.floor(Math.random() * availableSquares.length)];
	position[knight2Pos] = 'N';
	availableSquares.splice(availableSquares.indexOf(knight2Pos), 1);
	// Step 4: Place king and rooks (king must be between rooks)
	// Sort remaining squares to ensure proper rook-king-rook placement
	availableSquares.sort(function (a, b) {
		return a - b;
	});
	position[availableSquares[0]] = 'R'; // First rook
	position[availableSquares[1]] = 'K'; // King
	position[availableSquares[2]] = 'R'; // Second rook
	// Update board display
	for (var i = 0; i < 8; i++) {
		boardSquares[i].setPiece(pieceSymbols[position[i]]);
	}
	// Generate position notation
	currentPosition = position.join('');
	updatePositionText();
}
function calculatePositionNumber(position) {
	// Calculate Chess960 position number (0-959)
	var n = 0;
	var pieces = position.split('');
	// Find king position
	var kingPos = pieces.indexOf('K');
	var leftRook = pieces.indexOf('R');
	var rightRook = pieces.lastIndexOf('R');
	// N1: King position relative to rooks (0-3)
	var rookPairs = [[0, 1], [0, 2], [0, 3], [0, 4], [0, 5], [0, 6], [0, 7], [1, 2], [1, 3], [1, 4], [1, 5], [1, 6], [1, 7], [2, 3], [2, 4], [2, 5], [2, 6], [2, 7], [3, 4], [3, 5], [3, 6], [3, 7], [4, 5], [4, 6], [4, 7], [5, 6], [5, 7], [6, 7]];
	var rookPairIndex = -1;
	for (var i = 0; i < rookPairs.length; i++) {
		if (rookPairs[i][0] === leftRook && rookPairs[i][1] === rightRook) {
			rookPairIndex = i;
			break;
		}
	}
	var n1 = 0;
	for (var pos = leftRook + 1; pos < rightRook; pos++) {
		if (pieces[pos] === 'K') break;
		n1++;
	}
	// N2: Queen position (0-5)
	var queenPos = pieces.indexOf('Q');
	var emptySquares = [];
	for (var i = 0; i < 8; i++) {
		if (pieces[i] !== 'R' && pieces[i] !== 'K') {
			emptySquares.push(i);
		}
	}
	var n2 = emptySquares.indexOf(queenPos);
	// N3: Light bishop position (0-3)
	var lightSquares = [1, 3, 5, 7];
	var lightBishopPos = -1;
	for (var i = 0; i < lightSquares.length; i++) {
		if (pieces[lightSquares[i]] === 'B') {
			lightBishopPos = i;
			break;
		}
	}
	var n3 = lightBishopPos;
	// N4: Dark bishop position (0-3)
	var darkSquares = [0, 2, 4, 6];
	var darkBishopPos = -1;
	for (var i = 0; i < darkSquares.length; i++) {
		if (pieces[darkSquares[i]] === 'B') {
			darkBishopPos = i;
			break;
		}
	}
	var n4 = darkBishopPos;
	// N5: Knight positions (0-9)
	var knights = [];
	for (var i = 0; i < 8; i++) {
		if (pieces[i] === 'N') {
			knights.push(i);
		}
	}
	var availableForKnights = [];
	for (var i = 0; i < 8; i++) {
		if (pieces[i] !== 'R' && pieces[i] !== 'K' && pieces[i] !== 'Q' && pieces[i] !== 'B') {
			availableForKnights.push(i);
		}
	}
	var n5 = 0;
	if (availableForKnights.length >= 2) {
		var first = availableForKnights.indexOf(knights[0]);
		var second = availableForKnights.indexOf(knights[1]);
		if (first < second) {
			n5 = first * (availableForKnights.length - 1) + second - 1;
		} else {
			n5 = second * (availableForKnights.length - 1) + first;
		}
	}
	return n4 + 4 * n3 + 16 * n5 + 96 * n2 + 576 * n1;
}
function updatePositionText() {
	if (positionText) {
		positionText.setText('Position: ' + currentPosition);
	}
	if (numericalText) {
		var posNumber = calculatePositionNumber(currentPosition);
		numericalText.setText('Position #' + posNumber);
	}
}
function copyPosition() {
	// Flash effect to show copy action
	LK.effects.flashScreen(0x27ae60, 300);
}
function resetToStandard() {
	var standardPosition = ['R', 'N', 'B', 'Q', 'K', 'B', 'N', 'R'];
	for (var i = 0; i < 8; i++) {
		boardSquares[i].setPiece(pieceSymbols[standardPosition[i]]);
	}
	currentPosition = standardPosition.join('');
	updatePositionText();
}
// Initialize board
initializeBoard();
// Create title
var titleText = new Text2('Chess960 Position Generator', {
	size: 60,
	fill: 0xFFFFFF
});
titleText.anchor.set(0.5, 0);
titleText.x = 2048 / 2;
titleText.y = 100;
game.addChild(titleText);
// Create subtitle for ranks
var rankLabel = new Text2('Ranks 8 (Black) and 2 (White)', {
	size: 32,
	fill: 0xBDC3C7
});
rankLabel.anchor.set(0.5, 1);
rankLabel.x = 2048 / 2;
rankLabel.y = 380;
game.addChild(rankLabel);
// Create position display text
positionText = new Text2('Position: RNBQKBNR', {
	size: 48,
	fill: 0xFFFFFF
});
positionText.anchor.set(0.5, 0);
positionText.x = 2048 / 2;
positionText.y = 1000;
game.addChild(positionText);
// Create numerical position display
var numericalText = new Text2('Position #518', {
	size: 40,
	fill: 0xE8C547
});
numericalText.anchor.set(0.5, 0);
numericalText.x = 2048 / 2;
numericalText.y = 1060;
game.addChild(numericalText);
// Create generate button
var generateBtn = new GenerateButton(generateChess960Position);
generateBtn.x = 2048 / 2;
generateBtn.y = 1200;
game.addChild(generateBtn);
// Create copy button
var copyBtn = new ActionButton('Copy Position', 'green', copyPosition);
copyBtn.x = 2048 / 2 - 200;
copyBtn.y = 1400;
game.addChild(copyBtn);
// Create reset button
var resetBtn = new ActionButton('Standard Setup', 'red', resetToStandard);
resetBtn.x = 2048 / 2 + 200;
resetBtn.y = 1380;
game.addChild(resetBtn);
// Create rules title
var rulesText = new Text2('Rules', {
	size: 36,
	fill: 0xFFFFFF
});
rulesText.anchor.set(0.5, 0);
rulesText.x = 2048 / 2;
rulesText.y = 1420;
game.addChild(rulesText);
// Create instructions
var instructionText = new Text2('Bishops on opposite colors, King between Rooks', {
	size: 28,
	fill: 0x95A5A6
});
instructionText.anchor.set(0.5, 0);
instructionText.x = 2048 / 2;
instructionText.y = 1460;
game.addChild(instructionText);
// Set initial standard position
currentPosition = 'RNBQKBNR';
resetToStandard();

===================================================================
--- original.js
+++ change.js
@@ -321,16 +321,25 @@
 var resetBtn = new ActionButton('Standard Setup', 'red', resetToStandard);
 resetBtn.x = 2048 / 2 + 200;
 resetBtn.y = 1380;
 game.addChild(resetBtn);
+// Create rules title
+var rulesText = new Text2('Rules', {
+	size: 36,
+	fill: 0xFFFFFF
+});
+rulesText.anchor.set(0.5, 0);
+rulesText.x = 2048 / 2;
+rulesText.y = 1420;
+game.addChild(rulesText);
 // Create instructions
 var instructionText = new Text2('Bishops on opposite colors, King between Rooks', {
 	size: 28,
 	fill: 0x95A5A6
 });
 instructionText.anchor.set(0.5, 0);
 instructionText.x = 2048 / 2;
-instructionText.y = 1450;
+instructionText.y = 1460;
 game.addChild(instructionText);
 // Set initial standard position
 currentPosition = 'RNBQKBNR';
 resetToStandard();
\ No newline at end of file