no computers - Another Easy Mate in 1 - Puzzling Stack Exchange

Standard chess rules apply, the board is not rotated (i.e. white pawns move upwards), no lateral thinking is needed. Simply find the one move for white which mates the black king. This puzzle was

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100 Headachingly Hard Mate in Two Chess Puzzles Composed by Sam Loyd: Improve Your Ability to Calculate Variations and Finding Checkmate

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