en passe?
http://www.chess.com/forum/view/general/how-can-this-happen
I just had a look at the game and it was definitely en passant.
The move is prefectly legal, perhaps you should review the rules, beofre you start calling cheat or computer glitch!
The last rule about pawns is called “en passant,” which is French basically means “in passing”. If a pawn moves out two squares on its first move, and by doing so lands to the side of an opponent’s pawn (effectively jumping past the other pawn’s ability to capture it), that other pawn has the option of capturing the first pawn as it passes by. This special move must be done immediately after the first pawn has moved past, otherwise the option to capture it is no longer available.
I have a situation where a move was made against me that is impossible , and the opponent will not offer a draw . What else can I do?