Queens Gambit Declined Orthodox Defense En Passant in Chess

In the Queens Gambit Declined Orthodox Defense En Passant, Black accepts the QGD structure (typically after 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7) and the game reaches a position where an en-passant capture becomes legal. The defining feature is that White’s pawn advances two squares adjacent to a Black pawn, allowing Black to capture it “as if” it had moved only one square. This motif is tied to the orthodox QGD pawn setup and timing rather than a special piece sacrifice.