Philidor Defense En Passant in Chess

In the Philidor Defense, the “En Passant” motif appears when Black plays ...c5 and White has a pawn on d5 (or equivalently, a pawn that can capture en passant). The defining feature is that White’s pawn can capture the pawn that just advanced two squares, immediately removing it from the board via en passant. This tactical resource often arises from the typical Philidor structure where Black’s queenside pawn break meets a pawn on the 5th rank.