var AI = function () {
	this.makeMove = function (board) {};
};
var Tile = Container.expand(function () {
	var self = Container.call(this);
	var tileGraphics = self.createAsset('tile', 'Game Tile', .5, .5);
	self.state = 'empty';
	self.flip = function (newState) {
		self.state = newState;
		if (self.state === 'black') {
			self.createAsset('blackTile', 'Black Tile', .5, .5);
		} else if (self.state === 'white') {
			self.createAsset('whiteTile', 'White Tile', .5, .5);
		}
	};
	self.on('down', function (obj) {
		var pos = obj.event.getLocalPosition(self.parent);
		var i = Math.floor((pos.x - self.parent.boardStartX) / self.width);
		var j = Math.floor((pos.y - self.parent.boardStartY) / self.height);
		if (playerTurn === 'black' && self.state === 'empty' && isValidMove(i, j, 'black', board)) {
			self.flip('black');
		}
	});
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var board = [];
	var ai = new AI();
	var playerTurn = 'black';
	var tile = new Tile();
	var boardWidth = 8 * tile.width;
	var boardHeight = 8 * tile.height;
	var boardStartX = (2048 - boardWidth) / 2;
	var boardStartY = (2732 - boardHeight) / 2;
	var boardStartX = (2048 - boardWidth) / 2;
	var boardStartY = (2732 - boardHeight) / 2;
	for (var i = 0; i < 8; i++) {
		board[i] = [];
		for (var j = 0; j < 8; j++) {
			var tile = self.addChild(new Tile());
			tile.x = boardStartX + i * tile.width;
			tile.y = boardStartY + j * tile.height;
			board[i][j] = tile;
			tile.on('down', function (obj) {
				if (playerTurn === 'black' && tile.state === 'empty' && isValidMove(i, j, 'black', board)) {
					tile.flip('black');
				}
			});
		}
	}
	board[3][3].flip('white');
	board[3][4].flip('black');
	board[4][3].flip('black');
	board[4][4].flip('white');
	ai.makeMove(board);
	function isValidMove(x, y, color, board) {
		var dx, dy, x1, y1, count;
		for (dx = -1; dx <= 1; dx++) {
			for (dy = -1; dy <= 1; dy++) {
				x1 = x + dx;
				y1 = y + dy;
				count = 0;
				while (x1 >= 0 && x1 < 8 && y1 >= 0 && y1 < 8 && board[x1][y1].state !== 'empty' && board[x1][y1].state !== color) {
					count++;
					x1 += dx;
					y1 += dy;
				}
				if (count > 0 && x1 >= 0 && x1 < 8 && y1 >= 0 && y1 < 8 && board[x1][y1].state === color) {
					return true;
				}
			}
		}
		return false;
	}
	LK.on('tick', function () {});
});

===================================================================
--- original.js
+++ change.js
@@ -18,17 +18,16 @@
 		var i = Math.floor((pos.x - self.parent.boardStartX) / self.width);
 		var j = Math.floor((pos.y - self.parent.boardStartY) / self.height);
 		if (playerTurn === 'black' && self.state === 'empty' && isValidMove(i, j, 'black', board)) {
 			self.flip('black');
-			playerTurn = 'white';
-			ai.makeMove(board);
 		}
 	});
 });
 var Game = Container.expand(function () {
 	var self = Container.call(this);
 	var board = [];
 	var ai = new AI();
+	var playerTurn = 'black';
 	var tile = new Tile();
 	var boardWidth = 8 * tile.width;
 	var boardHeight = 8 * tile.height;
 	var boardStartX = (2048 - boardWidth) / 2;
@@ -44,10 +43,8 @@
 			board[i][j] = tile;
 			tile.on('down', function (obj) {
 				if (playerTurn === 'black' && tile.state === 'empty' && isValidMove(i, j, 'black', board)) {
 					tile.flip('black');
-					playerTurn = 'white';
-					ai.makeMove(board);
 				}
 			});
 		}
 	}