var?chessBoard=[];
var?me=true;
for?(var?i?=?0;?i?<?15;?i++)?{
	chessBoard[i]=[];
	for?(var?j?=?0;?j?<?chessBoard.length;?j++)?{
		chessBoard[i][j]=0;
	};
};
var?chess=document.getElementById('chess');
var?context=chess.getContext('2d');
context.strokeStyle="#bfbfbf";
var?logo=new?Image();
logo.src="images/logo.png";
logo.onload=function(){
	context.drawImage(logo,0,0,450,450);
	drawChessBoard();
}
var?drawChessBoard=function(){
	for?(var?i?=?0;?i?<?15;?i++)?{
		context.moveTo(15+i*30,15);
		context.lineTo(15+i*30,435);
		context.stroke();
		context.moveTo(15,15+i*30);
		context.lineTo(435,15+i*30);
		context.stroke();
	};
}
var?oneStep=function(i,j,me){
	context.beginPath();
	context.arc(15+i*30,15+j*30,13,0,2*Math.PI);
	context.closePath();
	var?gradient=context.createRadialGradient(15+i*30+2,15+j*30-2,13,15+i*30+2,15+j*30-2,0);
	if(me){
		gradient.addColorStop(0,"#0a0a0a");
		gradient.addColorStop(1,"#636766");
	}else{
		gradient.addColorStop(0,"#d1d1d1");
		gradient.addColorStop(1,"#f9f9f9");
	}
	context.fillStyle=gradient;
	context.fill();
}
chess.onclick=function(e){
	var?x=e.offsetX;
	var?y=e.offsetY;
	var?i=Math.floor(x/30);
	var?j=Math.floor(y/30);
	if(chessBoard[i][j]==0){
		oneStep(i,j,me);
		if(me){
			chessBoard[i][j]=1;
		}else{
			chessBoard[i][j]=2;
		}
		me=!me;
	}
}