It isn't a bug. It's a legal move called En Passant: http://en.wikipedia.org/wiki/En_passant
Bug
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Hi. I played one game. And right here I think you can see the game.
http://www.chess.com/livechess/game?id=679954725
I was black. Look at 12 and 13 moves... Whith pawn i went in c4 but later he I think you can see for yourself.I lost game because of that bug... Please fix that. Thanks.