The short answer
En passant lets a pawn capture an adjacent enemy pawn immediately after that enemy pawn advances two squares. The capturing pawn lands on the square the other pawn passed over.
En passant can look like a piece disappeared from the wrong square. It is a normal chess rule, not a glitch or a special power. The unusual picture comes from its purpose: a pawn cannot use its initial two-square move to slip past an enemy pawn that could have captured it after a one-square move.
You need to remember the previous move as well as the current arrangement. Two identical-looking boards may offer different legal captures because the pawns reached their squares in different ways. Once you learn the short checklist, the move is as predictable as an ordinary diagonal pawn capture.
See the move as three square changes
In an ordinary capture, the attacking piece lands on the captured piece’s square. En passant changes three squares instead. Your pawn leaves its original square, arrives diagonally one square forward on an empty square, and the enemy pawn beside its original square is removed. Thinking through all three changes prevents the most common execution mistake: leaving the captured pawn on the board.
The capturing pawn still moves in its normal attacking direction. White travels towards higher rank numbers; Black travels towards lower ones. Nothing moves backwards. The empty destination is permitted because this specific capture treats the opponent’s two-square advance as if the pawn had stopped after the first square.
Worked example: White captures on d6
Put a white pawn on e5. Black now advances a pawn from d7 to d5. The pawns stand side by side, and the black pawn passed through d6. White may immediately move the e5 pawn to d6 and remove the black pawn from d5. The move is written exd6: a pawn from the e-file captures onto d6.
After the capture, e5 and d5 are empty and a white pawn occupies d6. It is Black’s turn. White has not gained another move or left a pawn behind. If you are teaching this over a board, pause before removing anything and ask the learner to point to the departure, arrival and removal squares separately.
Worked example: Black captures on d3
Reverse the direction for Black. Place a black pawn on e4 and let White play d2-d4. Black may move e4 to d3, removing the white pawn from d4. The notation is again exd3, because the departure file is e and the destination is d3. The rule works symmetrically, even when a flipped board makes the direction look unfamiliar.
White’s capturing pawn must therefore be on its fifth rank, while Black’s must be on its fourth rank. Memorising those numbers can help, but the board relationship matters more: your pawn is beside the pawn that just moved two squares, and your diagonal forward step reaches its passed-over square.
The chance lasts for your immediate reply
You must use en passant on the very next move after the two-square pawn advance. If White answers d7-d5 with a king move instead of exd6, that particular en passant opportunity ends. It does not return later if the two pawns remain side by side. Nor does a new threat, check or change of plan extend its life.
The capture is optional whenever another legal move is available. Sometimes keeping your pawn where it is preserves a useful barrier; sometimes capturing opens a valuable file. Do not confuse the short deadline with an obligation. First identify whether the option exists, then compare it with your other legal choices.
Similar-looking positions that do not qualify
A pawn that advances just one square cannot be captured en passant. A pawn that advanced two squares on an earlier turn cannot be captured this way now. Neither a knight’s jump nor another piece’s movement creates an en passant target. Two enemy pawns being adjacent is necessary for the usual picture, but it does not prove how the last move happened.
An enemy pawn landing directly in your pawn’s ordinary diagonal attack can be captured normally, without using this rule. Keep those cases separate: ordinary capture removes the piece on your destination square; en passant removes the just-advanced pawn beside you. Ask “What was the last move?” whenever the board alone leaves you unsure.
Removing both pawns can uncover a rook
Every pawn capture must obey king safety. En passant deserves a second look because it removes two blockers from their original rank at once. A rook or queen that previously had no line to your king may suddenly see it. If the resulting position exposes your king, the capture is illegal even though the pawn arrangement and timing are otherwise correct.
Here White’s king is on h5, a white pawn on g5, a black pawn on f5 and a black rook on a5. Black has just played f7-f5. Trying gxf6 would clear both g5 and f5, opening the entire fifth rank from the rook to White’s king. White must choose another legal move. This is a king-safety prohibition, not an exception to the timing rule.
En passant can also answer a check
The same rule can help the defending king. Suppose White has a king on e4 and pawn on e5, Black has a king on e8, and Black has just advanced d7-d5. The new black pawn checks the king on e4. White may answer exd6 en passant: the checking pawn disappears from d5, and the white king is safe in the resulting position.
For any complicated example, imagine the complete board after the move before deciding. Examine newly opened ranks, files and diagonals, not just the capturing pawn’s destination. A useful practice routine is to compare a legal example with a position that differs only by a rook’s location, then explain exactly why the answers differ.
Reading the move in a score or replay
The normal algebraic capture notation is enough to identify the move in context. Some teaching material adds “e.p.” as an explanation, but that annotation does not create an extra action. In a replay, step back once to see the two-square advance, then forward to see why the captured pawn leaves a different square from the destination.
When sharing a puzzle, provide the last move or a complete position record with its en passant information. A diagram with no history can make an apparently simple question ambiguous. Do not accuse another player of an illegal move merely because the destination was empty; reconstruct the previous turn first.
A little extra clarity
Common questions
Do I have to capture en passant?
No, unless it happens to be your only legal move. You may choose any other legal response, but the opportunity from that particular pawn advance then expires.
Can a rook capture en passant?
No. Only a pawn captures en passant, and the captured piece must be a pawn that has just made its initial two-square advance.
Can en passant expose my king?
You must not play it if it would. Remove the captured pawn in your mental picture before checking for newly opened attacks.
Can en passant give check or checkmate?
Yes. Its removal of blockers can create an attack on the opposing king. Your own king must still be safe after the move.
Why did the chance disappear even though neither pawn moved?
The rule is tied to the immediate reply, not just the pawn locations. Making a different move lets that opportunity expire.
Sources and further reading
Official rules and the references used for this guide.
Written by the Theme Chess team. Explanations help you learn; the linked rules remain the reference for formal play.