Pawn movement in Chess?
Pawns cannot capture in a forward direction, even though they move that way. If they could, there would be no way of blocking them. E.g. 1. e4   e5.  2. e4xe5. So the pawn cannot capture the blocking bishop.

Pawns capture only in a forward diagonal direction. But there are two such directions; left diagonal and right diagonal. Pawns are the only pieces in chess that capture differently from the way they move.