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En passant is the rule that surprises beginners most, and even experienced players forget it in the heat of a game. That makes it a perfect puzzle theme. In these positions, capturing en passant is the key move, or the move that unlocks the rest of the solution. Sometimes it simply wins a pawn. More often it opens a file, a diagonal or a rank at exactly the right moment.
The rule, precisely
En passant (French for “in passing”) lets a pawn capture an enemy pawn that has just moved two squares forward and landed right beside it. The conditions are strict:
- Your pawn must stand on its fifth rank: the fifth rank for White, the fourth rank for Black.
- The enemy pawn must have just advanced two squares from its starting square, landing on the square directly next to your pawn.
- You must capture immediately, on the very next move. If you play anything else, the chance is gone for good.
You capture by moving your pawn diagonally to the square the enemy pawn skipped over, and the enemy pawn is removed from the board. For example, with a white pawn on e5, if Black plays d7-d5, White can reply exd6. The white pawn lands on d6 and the black pawn disappears from d5.
Like any move, it must also be legal: if capturing en passant would leave your own king in check, you can’t play it.
Why it matters in tactics
En passant is unusual because a single capture empties two squares on the same rank and fills one square on the next rank. That creates some special effects:
- Opening a line. Removing the pawn that just moved can clear a diagonal for a bishop or a file for a rook, often as a discovered attack.
- Discovered check. If your pawn was blocking a line from one of your pieces to the enemy king, capturing en passant moves it out of the way and gives check.
- Escaping check. If the two-square pawn move itself gives check, capturing it en passant removes the checking pawn. Sometimes it’s the only legal reply.
- Mate. The pawn’s new square can give check on its own, and occasionally that check is mate.
There’s a defensive twist too. Because both pawns vanish from the same rank, en passant can open that rank between a king and an enemy rook or queen. In that case the capture is illegal, which is worth knowing when you check the opponent’s possible replies.
How to spot it
The trigger is always the opponent’s last move. If they just pushed a pawn two squares and it landed beside one of yours, stop and ask whether capturing en passant achieves something. In puzzles, that pawn push is typically the last move played before your turn, so look at what just moved.
Common mistakes
- Assuming the pawn is safe because it has passed yours. It isn’t, at least for one move.
- Trying to capture en passant a move too late. The right expires immediately.
- Applying the rule to pieces. Only pawns can capture en passant, and only pawns can be captured that way.
- Forgetting that the capture is illegal if it exposes your own king.
Tips
When you see a two-square pawn push next to your pawn, list every line the capture would open and every square your pawn would attack from its new spot. Pay special attention to bishops, rooks and queens standing behind the pawns. And after you solve one of these puzzles, replay it slowly: watching two pawns leave one rank while a pawn appears on the next helps the geometry stick.
