Chess puzzle (Checkmate)
Opening: Nimzowitsch_Defense, Nimzowitsch_Defense_Colorado_Countergambit_Accepted
Moves: 1. e4 Nc6 2. Nf3 f5 3. exf5 d5 4. d4 Bxf5 5. Bd3 Bxd3 6. Qxd3 e6 7. Bg5 Nf6 8.
c3 Qd7 9. Nbd2 Be7 10. O-O O-O 11. Rae1 Rae8 12. Re2 Nh5 13. Rfe1 Bxg5 14. Nxg5
Nf4 *
Position (FEN): 4rrk1/pppq2pp/2n1p3/3p2N1/3P1n2/2PQ4/PP1NRPPP/4R1K1 w - - 1 15
White to move.
Themes: Kingside Attack Middlegame Mate in 1 
Puzzle rating: 860
Best move: Qxh7#