Here it's the black Pawn pretending that the white Pawn advanced a single square. The black Pawn captures on its diagonal and the white Pawn disappears from the board.
Here is a summary of the en passant rules.
- The move holds for any Pawn on its fifth row with an enemy Pawn on either adjacent column.
- The enemy Pawn must be on its second row.
- The option is triggered as soon as the enemy Pawn advances two squares.
- The option is lost if not used immediately.


