Cool, good idea!<p>I have a couple bits of cosmetic feedback for you:<p>I would like the chess pieces to appear much larger within each of their squares, ala <a href="http:&#x2F;&#x2F;www.365chess.com&#x2F;opening.php" rel="nofollow">http:&#x2F;&#x2F;www.365chess.com&#x2F;opening.php</a><p>Also, the green border around protected cells is difficult for me to discern. (Might be due to my colorblindness.)