En passant puzzles, and why the move gets missed
A legal capture that is available for exactly one move, in positions that almost never look like they are about a pawn.
- 120 positions in the course
- Difficulty 1097–2731
- Section: Blind Spots
- 5 levels
The rule, and what it actually does
A pawn that moves two squares forward and lands beside an enemy pawn can be captured by that pawn as though it had only moved one square. The capture is legal on the very next move and never again. That is the whole rule, and it exists so that the two-square first move cannot be used to sneak a pawn past one that was guarding the square.
What makes it worth a skill of its own is that the capture does far more than win a pawn. It opens a file, removes the pawn holding a chain together, or breaks a blockade -- and it does all of that while the opponent has stopped counting it as a legal move at all. Of the 120 positions here, thirty-four are also tagged as discovered attacks and thirty-two as discovered checks, which is the same fact from the other side: the pawn that disappears was standing in front of something.
How to spot it
- The trigger is always the same. Their pawn just moved two squares and landed beside one of yours. Check it every single time.
- Ask what the captured pawn was blocking, not what it was worth. The file or diagonal it opens is usually the point.
- In pawn endgames, en passant frequently changes who wins the race. Twenty of these positions are pawn endgames.
- Remember the window. If you do not take it now, the option is gone permanently, so it has to be checked before you play anything else.
Three en passant positions
Three positions from the 120 in this skill, easiest first. The highlighted squares are the move your opponent has just played. Work it out before you open the answer.
Position 1
Black to move. Find the best move.
Show the answer
38.g4 38...hxg3#
The line ends in checkmate. Every position in this skill has an en passant capture somewhere in the solution, which is the one legal move most players never add to the list.
The position comes from an endgame of a real game, rated 1392 for difficulty. The answer reaches checkmate.
Position 2
White to move. Find the best move.
Show the answer
30...Ne3 31.d5+ e5 32.dxe6#
The line ends in checkmate. Every position in this skill has an en passant capture somewhere in the solution, which is the one legal move most players never add to the list.
The position comes from the middlegame of a real game, rated 1609 for difficulty. The answer reaches checkmate.
Position 3
Black to move. Find the best move.
Show the answer
13.d4 13...exd3 14.cxd3 14...Nd4
The line comes out level on material and ahead on position. Every position in this skill has an en passant capture somewhere in the solution, which is the one legal move most players never add to the list.
The position comes from the opening of a real game, rated 2231 for difficulty. The answer reaches a clear advantage.
Why strong players still miss it
It is not a knowledge problem. Almost everyone above beginner level knows the rule and can recite it, and they still miss the move, because candidate generation is a habit rather than a lookup. Your eye scans checks, captures of pieces and threats; a pawn capture onto an empty square is on none of those lists unless you have put it there deliberately.
The fix is mechanical. Attach the check to the trigger rather than to the position: when a pawn lands next to yours after a double step, look, every time, even when the position is obviously not about pawns. Three or four sessions of these is usually enough to make it automatic, and it stays.
Questions people ask
What is the en passant rule in chess?
When a pawn advances two squares from its starting rank and ends up directly beside an enemy pawn, that enemy pawn may capture it as if it had moved only one square. The capture must be made immediately, on the very next move, or the right is lost.
Is en passant compulsory?
No. It is an option like any other capture. The only unusual part is the deadline: the right expires after one move and does not come back.
Why does en passant exist?
The two-square first move was introduced to speed up the opening. Without en passant it would also let a pawn slip past an enemy pawn that was controlling the square it crossed, which the rule prevents.
Nearby patterns
En Passant sits in Blind Spots. The rest of that section: