En passant

En Passant
En passant is where if your opponent moves two squares with their pawn on their first move and your pawns end up in a horizontal line you can take their piece as if it had only moved one piece. You can only done this straight after they have moved not in three or four moves. Not many young players will have heard of it so you can catch someone out with En passant in a game.
Fun Facts
1.En passant means ‘in passing’ in french.
2. It was invented by Spanish master Ruy Lopez.
3. It’s not like castling, not many people know of it.