Special moves
En passant
A pawn captures a pawn that just slipped past it with a double step.
What is the en passant?
En passant ("in passing") lets a pawn capture an enemy pawn that has just advanced two squares from its start, landing beside it — as if it had moved only one. The capture must be made immediately, on the very next move, or the right is lost.
Why the en passant matters
It is the most forgotten rule in chess, which is exactly why it wins games: defenders overlook it, and whole combinations hinge on a capture the opponent did not believe was legal. Sometimes en passant is the only move that opens a file or saves a tempo.
How to use it to win
Whenever an enemy pawn double-steps next to one of yours, pause and check the en-passant capture as a real candidate — it may open a line toward the king or remove a key defender. And remember: use it now, or never.
Try an example puzzle
A real en passant puzzle from the app. White to move — find the idea, then reveal the line.
6 
Show solution
1. fxg6#
Drill the en passant on thousands of real puzzles, matched to your rating.