Mexican Defense En Passant in Chess

“Mexican Defense En Passant” is the en-passant capture that can arise from the Mexican Defense pawn structure, typically after Black plays a two-square pawn advance that lands adjacent to White’s pawn. The defining feature is that White must have a pawn on the correct 5th rank and Black’s last move must be the specific double-step that creates the en-passant square. If those conditions are met, White can capture as if the pawn had moved only one square.