To capture en passant, the white Pawn moves as though it were capturing on its diagonal and the black Pawn disappears from the board.
The en passant option is available to the white Pawn only on the move immediately following the black Pawn's bold attempt to run past the white Pawn. If White makes another move, the option disappears. Of course, if Black had a Pawn sitting on its original square on the other column adjacent to the white Pawn, and if it also advanced two squares, the en passant option would appear on that side for the following move.
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