En passant
A pawn that advances two squares from its starting rank may be captured by an enemy pawn as if it had stopped on the intermediate square. The right exists only on the immediately following move — after that the window closes forever. In notation it looks like an ordinary pawn capture, for example exd6.
Start
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3.
The e5-pawn captures as if the d5-pawn had only stepped to d6 — the d5-pawn itself disappears from the board.