This should answer all your questions :
http://www.chess.com/chessopedia/view/en-passant
ep?
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Aug 13, 2007
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#2
question. when im playing the computer and i move my pawn two squares forward. before i finish my turn the comp takes my pawn. Then writes c48x3ep? just wondering why? how? and what ep means so i can use it in further play.