Chess puzzle (Checkmate)
Opening: Blackmar-Diemer_Gambit_Accepted, Blackmar-Diemer_Gambit_Accepted_Euwe_Defense
Moves: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3 e6 6. Bg5 Be7 7. Bd3 c5 8.
Qd2 cxd4 9. Nxd4 Nc6 10. Nxc6 bxc6 11. O-O O-O 12. Qf4 Nd5 13. Qh4 Bxg5 *
Position (FEN): r1bq1rk1/p4ppp/2p1p3/3n2b1/7Q/2NB4/PPP3PP/R4RK1 w - - 0 14
White to move.
Themes: Kingside Attack Middlegame Mate in 1 
Puzzle rating: 869
Best move: Qxh7#