In this rook and pawn endgame, Black has just pushed their pawn to e2, one step from promoting. White is to move: can they halt this pawn before it becomes a queen?
Puzzle: Lichess open database (CC0) · Pieces: Cburnett, Wikimedia (CC BY-SA 3.0)
See the solution explained
Re7 places the white rook on the seventh rank, lurking behind the black pawn, and leaves Black seventeen possible replies.
Black pushes anyway with e1=Q, turning the pawn into a queen.
Rxe1 lets the white rook capture that freshly promoted queen, bringing the position back to a simple rook-and-pawn duel.
Remember the key idea: in a rook endgame, placing your rook behind the opponent's passed pawn lets you capture the new queen the moment it promotes. A vital resource to know in passed-pawn endgames.
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