Queen's Pawn Game En Passant in Chess

In the Queen’s Pawn Game, “en passant” is a special pawn capture that can occur right after an opponent advances a pawn two squares and lands adjacent to your pawn. The defining feature is the immediate tactical window created by the double-step move in a typical Queen’s Pawn structure (often after 1.d4 d5 and a later ...d5–d4 or ...c5–c4 type advance). If the capture is available, you may take as if the pawn had moved only one square.