It looks good!
Solitaire Chess

I like it.
Just a couple of feature requests :)
It would be nice if the pieces were clickable, so you have the option of either entering the move or moving the pieces.
Also, if you could get a score for either wrong or correct moves, that can help you gauge how you did. I think chessgames does it where the GM's moves gets you 3 points, losing moves deducts points, mediocre moves give no points and reasonable moves gets you 1-2 points.
I have made http://passionforchess.com/chess/showSolitaire/. Let me know your feedback.
thanks