/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
var ChessPiece = Container.expand(function (type, color, row, col) {
	var self = Container.call(this);
	self.type = type;
	self.color = color;
	self.row = row;
	self.col = col;
	self.hasMoved = false;
	self.hasBeenConverted = false;
	var assetName = color + type.charAt(0).toUpperCase() + type.slice(1);
	self.pieceGraphics = self.attachAsset(assetName, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.updatePosition = function () {
		self.x = 124 + self.col * 240;
		self.y = 366 + self.row * 240;
	};
	self.updatePosition();
	self.isValidMove = function (toRow, toCol) {
		var deltaRow = toRow - self.row;
		var deltaCol = toCol - self.col;
		var absDeltaRow = Math.abs(deltaRow);
		var absDeltaCol = Math.abs(deltaCol);
		switch (self.type) {
			case 'pawn':
				var direction = self.color === 'white' ? -1 : 1;
				var startRow = self.color === 'white' ? 6 : 1;
				if (deltaCol === 0) {
					if (deltaRow === direction && !board[toRow][toCol].piece) {
						return true;
					}
					if (self.row === startRow && deltaRow === 2 * direction && !board[toRow][toCol].piece) {
						return true;
					}
				} else if (absDeltaCol === 1 && deltaRow === direction) {
					if (board[toRow][toCol].piece && board[toRow][toCol].piece.color !== self.color) {
						return true;
					}
				}
				break;
			case 'rook':
				if (deltaRow === 0 || deltaCol === 0) {
					return isPathClear(self.row, self.col, toRow, toCol);
				}
				break;
			case 'knight':
				if (absDeltaRow === 2 && absDeltaCol === 1 || absDeltaRow === 1 && absDeltaCol === 2) {
					return true;
				}
				break;
			case 'bishop':
				if (absDeltaRow === absDeltaCol) {
					return isPathClear(self.row, self.col, toRow, toCol);
				}
				break;
			case 'queen':
				if (deltaRow === 0 || deltaCol === 0 || absDeltaRow === absDeltaCol) {
					return isPathClear(self.row, self.col, toRow, toCol);
				}
				break;
			case 'king':
				if (absDeltaRow <= 1 && absDeltaCol <= 1) {
					return true;
				}
				break;
			case 'mage':
				// Mage can move 1 square in any direction when no target
				if (!board[toRow][toCol].piece) {
					if (absDeltaRow <= 1 && absDeltaCol <= 1) {
						return true;
					}
				}
				// Mage can only attack diagonally forward
				else if (board[toRow][toCol].piece && board[toRow][toCol].piece.color !== self.color) {
					var direction = self.color === 'white' ? -1 : 1;
					if (deltaRow === direction && absDeltaCol === 1) {
						return true;
					}
				}
				break;
			case 'guard':
				if (absDeltaRow <= 1 && absDeltaCol <= 1) {
					return true;
				}
				break;
			case 'dragon':
				if (absDeltaRow === absDeltaCol && absDeltaRow <= 3) {
					return isPathClear(self.row, self.col, toRow, toCol);
				}
				if (absDeltaRow === 2 && absDeltaCol === 1 || absDeltaRow === 1 && absDeltaCol === 2) {
					return true;
				}
				break;
			case 'seer':
				var direction = self.color === 'white' ? -1 : 1;
				if (deltaCol === 0) {
					if (deltaRow === direction && !board[toRow][toCol].piece) {
						return true;
					}
				} else if (absDeltaCol === 2 && deltaRow === 2 * direction) {
					if (board[toRow][toCol].piece && board[toRow][toCol].piece.color !== self.color) {
						return true;
					}
				}
				break;
			case 'panther':
				if (absDeltaRow === 1 && absDeltaCol === 1) {
					return true;
				}
				break;
		}
		return false;
	};
	return self;
});
var ChessSquare = Container.expand(function (row, col) {
	var self = Container.call(this);
	self.row = row;
	self.col = col;
	self.isLight = (row + col) % 2 === 0;
	self.piece = null;
	self.isSelected = false;
	self.isValidMove = false;
	self.squareSize = 240;
	self.squareGraphics = self.attachAsset(self.isLight ? 'lightSquare' : 'darkSquare', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.selectedGraphics = null;
	self.validMoveGraphics = null;
	self.x = 124 + col * self.squareSize;
	self.y = 366 + row * self.squareSize;
	self.setSelected = function (selected) {
		self.isSelected = selected;
		if (selected) {
			if (!self.selectedGraphics) {
				self.selectedGraphics = self.attachAsset('selectedSquare', {
					anchorX: 0.5,
					anchorY: 0.5
				});
			}
			self.selectedGraphics.alpha = 0.5;
		} else {
			if (self.selectedGraphics) {
				self.selectedGraphics.alpha = 0;
			}
		}
	};
	self.setValidMove = function (valid) {
		self.isValidMove = valid;
		if (valid) {
			if (!self.validMoveGraphics) {
				self.validMoveGraphics = self.attachAsset('validMoveSquare', {
					anchorX: 0.5,
					anchorY: 0.5
				});
			}
			self.validMoveGraphics.alpha = 0.3;
		} else {
			if (self.validMoveGraphics) {
				self.validMoveGraphics.alpha = 0;
			}
		}
	};
	self.down = function (x, y, obj) {
		handleSquareClick(self.row, self.col);
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x4A4A4A
});

/**** 
* Game Code
****/ 
// Chess game state
var board = [];
var pieces = [];
var currentPlayer = 'white';
var selectedSquare = null;
var gameOver = false;
var whiteKing = null;
var blackKing = null;
var convertedPieces = [];
var isComputerPlayer = false;
var computerColor = 'black';
var computerThinking = false;
// Initialize the chess board
for (var row = 0; row < 8; row++) {
	board[row] = [];
	for (var col = 0; col < 8; col++) {
		var square = new ChessSquare(row, col);
		board[row][col] = square;
		game.addChild(square);
	}
}
// Initial piece setup with fantasy pieces
var initialSetup = [['rook', 'knight', 'bishop', 'queen', 'king', 'bishop', 'knight', 'rook'], ['pawn', 'dragon', 'pawn', 'guard', 'mage', 'pawn', 'dragon', 'pawn']];
var fantasySetup = [['dragon', 'seer', 'panther', '', '', 'panther', 'seer', 'dragon'], ['', '', '', '', '', '', '', '']];
// Place black pieces
for (var row = 0; row < 2; row++) {
	for (var col = 0; col < 8; col++) {
		var piece = new ChessPiece(initialSetup[row][col], 'black', row, col);
		pieces.push(piece);
		board[row][col].piece = piece;
		game.addChild(piece);
		if (piece.type === 'king') {
			blackKing = piece;
		}
	}
}
// Place white pieces
for (var row = 0; row < 2; row++) {
	for (var col = 0; col < 8; col++) {
		var piece = new ChessPiece(initialSetup[row][col], 'white', 7 - row, col);
		pieces.push(piece);
		board[7 - row][col].piece = piece;
		game.addChild(piece);
		if (piece.type === 'king') {
			whiteKing = piece;
		}
	}
}
// Place fantasy pieces for black (rows 2-3)
for (var row = 0; row < 2; row++) {
	for (var col = 0; col < 8; col++) {
		if (fantasySetup[row][col] !== '') {
			var piece = new ChessPiece(fantasySetup[row][col], 'black', row + 2, col);
			pieces.push(piece);
			board[row + 2][col].piece = piece;
			game.addChild(piece);
		}
	}
}
// Place fantasy pieces for white (rows 4-5)
for (var row = 0; row < 2; row++) {
	for (var col = 0; col < 8; col++) {
		if (fantasySetup[row][col] !== '') {
			var piece = new ChessPiece(fantasySetup[row][col], 'white', 5 - row, col);
			pieces.push(piece);
			board[5 - row][col].piece = piece;
			game.addChild(piece);
		}
	}
}
// Add protective pawns on row 3 for black (in front of Guard and Mage)
var blackGuardPawn = new ChessPiece('pawn', 'black', 2, 3);
pieces.push(blackGuardPawn);
board[2][3].piece = blackGuardPawn;
game.addChild(blackGuardPawn);
var blackMagePawn = new ChessPiece('pawn', 'black', 2, 4);
pieces.push(blackMagePawn);
board[2][4].piece = blackMagePawn;
game.addChild(blackMagePawn);
// Add protective pawns on row 5 for white (in front of Guard and Mage)
var whiteGuardPawn = new ChessPiece('pawn', 'white', 5, 3);
pieces.push(whiteGuardPawn);
board[5][3].piece = whiteGuardPawn;
game.addChild(whiteGuardPawn);
var whiteMagePawn = new ChessPiece('pawn', 'white', 5, 4);
pieces.push(whiteMagePawn);
board[5][4].piece = whiteMagePawn;
game.addChild(whiteMagePawn);
// UI Elements
var turnDisplay = new Text2('White to move', {
	size: 60,
	fill: '#FFFFFF'
});
turnDisplay.anchor.set(0.5, 0);
LK.gui.top.addChild(turnDisplay);
turnDisplay.y = 20;
var statusDisplay = new Text2('Select a piece to move', {
	size: 40,
	fill: '#FFFFFF'
});
statusDisplay.anchor.set(0.5, 1);
LK.gui.bottom.addChild(statusDisplay);
statusDisplay.y = -20;
function isPathClear(fromRow, fromCol, toRow, toCol) {
	var deltaRow = toRow - fromRow;
	var deltaCol = toCol - fromCol;
	var stepRow = deltaRow === 0 ? 0 : deltaRow > 0 ? 1 : -1;
	var stepCol = deltaCol === 0 ? 0 : deltaCol > 0 ? 1 : -1;
	var currentRow = fromRow + stepRow;
	var currentCol = fromCol + stepCol;
	while (currentRow !== toRow || currentCol !== toCol) {
		if (board[currentRow][currentCol].piece) {
			return false;
		}
		currentRow += stepRow;
		currentCol += stepCol;
	}
	return true;
}
function isInCheck(color) {
	var king = color === 'white' ? whiteKing : blackKing;
	if (!king) return false;
	for (var i = 0; i < pieces.length; i++) {
		var piece = pieces[i];
		if (piece.color !== color && piece.isValidMove(king.row, king.col)) {
			return true;
		}
	}
	return false;
}
function evaluatePosition() {
	var pieceValues = {
		'pawn': 1,
		'knight': 3,
		'bishop': 3,
		'rook': 5,
		'queen': 9,
		'king': 100,
		'mage': 4,
		'guard': 2,
		'dragon': 6,
		'seer': 2,
		'panther': 3
	};
	// Position value tables for pieces
	var pawnTable = [[0, 0, 0, 0, 0, 0, 0, 0], [5, 5, 5, 5, 5, 5, 5, 5], [1, 1, 2, 3, 3, 2, 1, 1], [0.5, 0.5, 1, 2.5, 2.5, 1, 0.5, 0.5], [0, 0, 0, 2, 2, 0, 0, 0], [0.5, -0.5, -1, 0, 0, -1, -0.5, 0.5], [0.5, 1, 1, -2, -2, 1, 1, 0.5], [0, 0, 0, 0, 0, 0, 0, 0]];
	var knightTable = [[-5, -4, -3, -3, -3, -3, -4, -5], [-4, -2, 0, 0, 0, 0, -2, -4], [-3, 0, 1, 1.5, 1.5, 1, 0, -3], [-3, 0.5, 1.5, 2, 2, 1.5, 0.5, -3], [-3, 0, 1.5, 2, 2, 1.5, 0, -3], [-3, 0.5, 1, 1.5, 1.5, 1, 0.5, -3], [-4, -2, 0, 0.5, 0.5, 0, -2, -4], [-5, -4, -3, -3, -3, -3, -4, -5]];
	var bishopTable = [[-2, -1, -1, -1, -1, -1, -1, -2], [-1, 0, 0, 0, 0, 0, 0, -1], [-1, 0, 0.5, 1, 1, 0.5, 0, -1], [-1, 0.5, 0.5, 1, 1, 0.5, 0.5, -1], [-1, 0, 1, 1, 1, 1, 0, -1], [-1, 1, 1, 1, 1, 1, 1, -1], [-1, 0.5, 0, 0, 0, 0, 0.5, -1], [-2, -1, -1, -1, -1, -1, -1, -2]];
	var rookTable = [[0, 0, 0, 0, 0, 0, 0, 0], [0.5, 1, 1, 1, 1, 1, 1, 0.5], [-0.5, 0, 0, 0, 0, 0, 0, -0.5], [-0.5, 0, 0, 0, 0, 0, 0, -0.5], [-0.5, 0, 0, 0, 0, 0, 0, -0.5], [-0.5, 0, 0, 0, 0, 0, 0, -0.5], [-0.5, 0, 0, 0, 0, 0, 0, -0.5], [0, 0, 0, 0.5, 0.5, 0, 0, 0]];
	var queenTable = [[-2, -1, -1, -0.5, -0.5, -1, -1, -2], [-1, 0, 0, 0, 0, 0, 0, -1], [-1, 0, 0.5, 0.5, 0.5, 0.5, 0, -1], [-0.5, 0, 0.5, 0.5, 0.5, 0.5, 0, -0.5], [0, 0, 0.5, 0.5, 0.5, 0.5, 0, -0.5], [-1, 0.5, 0.5, 0.5, 0.5, 0.5, 0, -1], [-1, 0, 0.5, 0, 0, 0, 0, -1], [-2, -1, -1, -0.5, -0.5, -1, -1, -2]];
	var kingTable = [[-3, -4, -4, -5, -5, -4, -4, -3], [-3, -4, -4, -5, -5, -4, -4, -3], [-3, -4, -4, -5, -5, -4, -4, -3], [-3, -4, -4, -5, -5, -4, -4, -3], [-2, -3, -3, -4, -4, -3, -3, -2], [-1, -2, -2, -2, -2, -2, -2, -1], [2, 2, 0, 0, 0, 0, 2, 2], [2, 3, 1, 0, 0, 1, 3, 2]];
	var score = 0;
	for (var i = 0; i < pieces.length; i++) {
		var piece = pieces[i];
		var value = pieceValues[piece.type] || 1;
		var positionValue = 0;
		// Add positional values
		var row = piece.row;
		var col = piece.col;
		if (piece.color === 'black') {
			row = 7 - row; // Flip for black pieces
		}
		switch (piece.type) {
			case 'pawn':
				positionValue = pawnTable[row][col];
				break;
			case 'knight':
				positionValue = knightTable[row][col];
				break;
			case 'bishop':
				positionValue = bishopTable[row][col];
				break;
			case 'rook':
				positionValue = rookTable[row][col];
				break;
			case 'queen':
				positionValue = queenTable[row][col];
				break;
			case 'king':
				positionValue = kingTable[row][col];
				break;
		}
		if (piece.color === computerColor) {
			score += value + positionValue;
		} else {
			score -= value + positionValue;
		}
	}
	// Add strategic bonuses
	var mobilityBonus = 0;
	var computerMoves = getAllValidMoves(computerColor);
	var opponentMoves = getAllValidMoves(computerColor === 'white' ? 'black' : 'white');
	mobilityBonus = (computerMoves.length - opponentMoves.length) * 0.1;
	score += mobilityBonus;
	// King safety evaluation
	var computerKing = computerColor === 'white' ? whiteKing : blackKing;
	var opponentKing = computerColor === 'white' ? blackKing : whiteKing;
	if (computerKing && opponentKing) {
		// Penalize exposed king
		var kingThreats = 0;
		for (var i = 0; i < pieces.length; i++) {
			if (pieces[i].color !== computerColor && pieces[i].isValidMove(computerKing.row, computerKing.col)) {
				kingThreats++;
			}
		}
		score -= kingThreats * 2;
	}
	return score;
}
function getAllValidMoves(color) {
	var moves = [];
	for (var i = 0; i < pieces.length; i++) {
		var piece = pieces[i];
		if (piece.color === color) {
			for (var row = 0; row < 8; row++) {
				for (var col = 0; col < 8; col++) {
					if (piece.isValidMove(row, col)) {
						var targetPiece = board[row][col].piece;
						if (!targetPiece || targetPiece.color !== piece.color) {
							moves.push({
								piece: piece,
								fromRow: piece.row,
								fromCol: piece.col,
								toRow: row,
								toCol: col,
								targetPiece: targetPiece
							});
						}
					}
				}
			}
		}
	}
	return moves;
}
function minimax(depth, isMaximizing, alpha, beta) {
	if (depth === 0 || gameOver) {
		return evaluatePosition();
	}
	var moves = getAllValidMoves(isMaximizing ? computerColor : computerColor === 'white' ? 'black' : 'white');
	if (moves.length === 0) {
		return isMaximizing ? -Infinity : Infinity;
	}
	var bestScore = isMaximizing ? -Infinity : Infinity;
	for (var i = 0; i < moves.length; i++) {
		var move = moves[i];
		// Make move
		var originalPiece = board[move.toRow][move.toCol].piece;
		board[move.piece.row][move.piece.col].piece = null;
		board[move.toRow][move.toCol].piece = move.piece;
		var oldRow = move.piece.row;
		var oldCol = move.piece.col;
		move.piece.row = move.toRow;
		move.piece.col = move.toCol;
		// Remove captured piece from pieces array temporarily
		var capturedIndex = -1;
		if (originalPiece) {
			for (var j = 0; j < pieces.length; j++) {
				if (pieces[j] === originalPiece) {
					capturedIndex = j;
					pieces.splice(j, 1);
					break;
				}
			}
		}
		var score = minimax(depth - 1, !isMaximizing, alpha, beta);
		// Unmake move
		move.piece.row = oldRow;
		move.piece.col = oldCol;
		board[oldRow][oldCol].piece = move.piece;
		board[move.toRow][move.toCol].piece = originalPiece;
		if (originalPiece && capturedIndex !== -1) {
			pieces.splice(capturedIndex, 0, originalPiece);
		}
		if (isMaximizing) {
			bestScore = Math.max(bestScore, score);
			alpha = Math.max(alpha, score);
		} else {
			bestScore = Math.min(bestScore, score);
			beta = Math.min(beta, score);
		}
		if (beta <= alpha) {
			break; // Alpha-beta pruning
		}
	}
	return bestScore;
}
function makeComputerMove() {
	if (computerThinking || gameOver) return;
	computerThinking = true;
	statusDisplay.setText('Computer thinking...');
	LK.setTimeout(function () {
		var moves = getAllValidMoves(computerColor);
		if (moves.length === 0) {
			computerThinking = false;
			return;
		}
		var bestMove = null;
		var bestScore = -Infinity;
		var searchDepth = 4; // Expert level depth
		// Define piece values for move sorting
		var pieceValues = {
			'pawn': 1,
			'knight': 3,
			'bishop': 3,
			'rook': 5,
			'queen': 9,
			'king': 100,
			'mage': 4,
			'guard': 2,
			'dragon': 6,
			'seer': 2,
			'panther': 3
		};
		// Order moves for better pruning
		moves.sort(function (a, b) {
			var scoreA = 0;
			var scoreB = 0;
			// Prioritize captures
			if (a.targetPiece) {
				scoreA += (pieceValues[a.targetPiece.type] || 1) * 10;
			}
			if (b.targetPiece) {
				scoreB += (pieceValues[b.targetPiece.type] || 1) * 10;
			}
			// Prioritize center control
			var centerDistanceA = Math.abs(a.toRow - 3.5) + Math.abs(a.toCol - 3.5);
			var centerDistanceB = Math.abs(b.toRow - 3.5) + Math.abs(b.toCol - 3.5);
			scoreA += 7 - centerDistanceA;
			scoreB += 7 - centerDistanceB;
			return scoreB - scoreA;
		});
		// Use minimax with alpha-beta pruning
		for (var i = 0; i < moves.length; i++) {
			var move = moves[i];
			// Make move
			var originalPiece = board[move.toRow][move.toCol].piece;
			board[move.piece.row][move.piece.col].piece = null;
			board[move.toRow][move.toCol].piece = move.piece;
			var oldRow = move.piece.row;
			var oldCol = move.piece.col;
			move.piece.row = move.toRow;
			move.piece.col = move.toCol;
			// Remove captured piece from pieces array temporarily
			var capturedIndex = -1;
			if (originalPiece) {
				for (var j = 0; j < pieces.length; j++) {
					if (pieces[j] === originalPiece) {
						capturedIndex = j;
						pieces.splice(j, 1);
						break;
					}
				}
			}
			var score = minimax(searchDepth - 1, false, -Infinity, Infinity);
			// Unmake move
			move.piece.row = oldRow;
			move.piece.col = oldCol;
			board[oldRow][oldCol].piece = move.piece;
			board[move.toRow][move.toCol].piece = originalPiece;
			if (originalPiece && capturedIndex !== -1) {
				pieces.splice(capturedIndex, 0, originalPiece);
			}
			if (score > bestScore) {
				bestScore = score;
				bestMove = move;
			}
		}
		if (bestMove) {
			movePiece(bestMove.piece, bestMove.toRow, bestMove.toCol);
		}
		computerThinking = false;
	}, 200); // Fast thinking time for responsive gameplay
}
function clearHighlights() {
	for (var row = 0; row < 8; row++) {
		for (var col = 0; col < 8; col++) {
			board[row][col].setSelected(false);
			board[row][col].setValidMove(false);
		}
	}
}
function highlightValidMoves(piece) {
	for (var row = 0; row < 8; row++) {
		for (var col = 0; col < 8; col++) {
			if (piece.isValidMove(row, col)) {
				var targetPiece = board[row][col].piece;
				if (!targetPiece || targetPiece.color !== piece.color) {
					board[row][col].setValidMove(true);
				}
			}
		}
	}
}
function handleSquareClick(row, col) {
	if (gameOver || computerThinking) return;
	if (isComputerPlayer && currentPlayer === computerColor) return;
	var clickedSquare = board[row][col];
	var clickedPiece = clickedSquare.piece;
	if (selectedSquare) {
		if (selectedSquare.row === row && selectedSquare.col === col) {
			clearHighlights();
			selectedSquare = null;
			statusDisplay.setText('Select a piece to move');
		} else if (clickedPiece && clickedPiece.color === currentPlayer) {
			clearHighlights();
			selectedSquare = clickedSquare;
			selectedSquare.setSelected(true);
			highlightValidMoves(clickedPiece);
			statusDisplay.setText('Select where to move ' + clickedPiece.type);
		} else {
			var selectedPiece = selectedSquare.piece;
			if (selectedPiece && selectedPiece.isValidMove(row, col)) {
				var targetPiece = clickedSquare.piece;
				if (!targetPiece || targetPiece.color !== selectedPiece.color) {
					movePiece(selectedPiece, row, col);
				}
			} else {
				statusDisplay.setText('Invalid move!');
			}
		}
	} else {
		if (clickedPiece && clickedPiece.color === currentPlayer) {
			selectedSquare = clickedSquare;
			selectedSquare.setSelected(true);
			highlightValidMoves(clickedPiece);
			statusDisplay.setText('Select where to move ' + clickedPiece.type);
		} else {
			statusDisplay.setText('Select a ' + currentPlayer + ' piece to move');
		}
	}
}
function movePiece(piece, toRow, toCol) {
	var targetPiece = board[toRow][toCol].piece;
	if (targetPiece) {
		// Mage special ability: convert captured piece
		if (piece.type === 'mage') {
			// Check if piece has already been converted
			if (targetPiece.hasBeenConverted) {
				statusDisplay.setText('This piece has already been converted!');
				return;
			}
			// Convert the target piece to the Mage's side
			targetPiece.color = piece.color;
			targetPiece.hasBeenConverted = true;
			targetPiece.pieceGraphics.destroy();
			var newAssetName = targetPiece.color + targetPiece.type.charAt(0).toUpperCase() + targetPiece.type.slice(1);
			targetPiece.pieceGraphics = targetPiece.attachAsset(newAssetName, {
				anchorX: 0.5,
				anchorY: 0.5
			});
			targetPiece.updatePosition();
			statusDisplay.setText('Mage converted ' + targetPiece.type + '!');
			LK.getSound('capture').play();
			// Move the mage to the target square
			board[piece.row][piece.col].piece = null;
			board[toRow][toCol].piece = piece;
			piece.row = toRow;
			piece.col = toCol;
			piece.hasMoved = true;
			piece.updatePosition();
			// Move the converted piece to the mage's original position
			var originalRow = piece.row;
			var originalCol = piece.col;
			board[originalRow][originalCol].piece = targetPiece;
			targetPiece.row = originalRow;
			targetPiece.col = originalCol;
			targetPiece.updatePosition();
			clearHighlights();
			selectedSquare = null;
			currentPlayer = currentPlayer === 'white' ? 'black' : 'white';
			turnDisplay.setText(currentPlayer.charAt(0).toUpperCase() + currentPlayer.slice(1) + ' to move');
			statusDisplay.setText('Select a piece to move');
			return;
		} else {
			LK.getSound('capture').play();
			targetPiece.destroy();
			for (var i = pieces.length - 1; i >= 0; i--) {
				if (pieces[i] === targetPiece) {
					pieces.splice(i, 1);
					break;
				}
			}
		}
		if (targetPiece && targetPiece.type === 'king') {
			gameOver = true;
			statusDisplay.setText(currentPlayer + ' wins!');
			if (currentPlayer === 'white') {
				LK.showYouWin();
			} else {
				LK.showGameOver();
			}
			return;
		}
	} else {
		LK.getSound('move').play();
	}
	board[piece.row][piece.col].piece = null;
	board[toRow][toCol].piece = piece;
	piece.row = toRow;
	piece.col = toCol;
	piece.hasMoved = true;
	piece.updatePosition();
	// Check for pawn promotion
	if (piece.type === 'pawn') {
		var promotionRow = piece.color === 'white' ? 0 : 7;
		if (piece.row === promotionRow) {
			// For demo purposes, auto-promote to queen
			// In full implementation, show promotion dialog
			piece.type = 'queen';
			piece.pieceGraphics.destroy();
			var newAssetName = piece.color + 'Queen';
			piece.pieceGraphics = piece.attachAsset(newAssetName, {
				anchorX: 0.5,
				anchorY: 0.5
			});
			piece.updatePosition();
			statusDisplay.setText('Pawn promoted to Queen!');
		}
	}
	clearHighlights();
	selectedSquare = null;
	currentPlayer = currentPlayer === 'white' ? 'black' : 'white';
	turnDisplay.setText(currentPlayer.charAt(0).toUpperCase() + currentPlayer.slice(1) + ' to move');
	statusDisplay.setText('Select a piece to move');
	if (isInCheck(currentPlayer)) {
		statusDisplay.setText(currentPlayer + ' is in check!');
		LK.effects.flashScreen(0xFF0000, 500);
	}
	var capturedPieces = 0;
	for (var i = 0; i < pieces.length; i++) {
		if (pieces[i].color !== currentPlayer) {
			capturedPieces++;
		}
	}
	LK.setScore(16 - capturedPieces);
	// Trigger computer move if it's computer's turn
	if (isComputerPlayer && currentPlayer === computerColor) {
		makeComputerMove();
	}
}
LK.playMusic('chessMusic');
// Enable computer player
isComputerPlayer = true;
computerColor = 'black';
game.update = function () {
	// Chess doesn't need continuous updates like RTS games
	// All game logic is handled by user interactions
};

===================================================================
--- original.js
+++ change.js
@@ -557,9 +557,9 @@
 		if (bestMove) {
 			movePiece(bestMove.piece, bestMove.toRow, bestMove.toCol);
 		}
 		computerThinking = false;
-	}, 1500); // Increased thinking time for expert level
+	}, 200); // Fast thinking time for responsive gameplay
 }
 function clearHighlights() {
 	for (var row = 0; row < 8; row++) {
 		for (var col = 0; col < 8; col++) {