Chess puzzle (Checkmate)
Opening: Blackmar-Diemer_Gambit_Accepted, Blackmar-Diemer_Gambit_Accepted_Ryder_Gambit
Moves: 1. d4 Nf6 2. Nc3 d5 3. e4 dxe4 4. f3 exf3 5. Qxf3 e6 6. Bg5 Be7 7. O-O-O c6 8.
h4 Nbd7 9. Bd3 Nb6 10. Nge2 Nbd5 11. Nxd5 Nxd5 12. Bxe7 Qxe7 13. Rhf1 Bd7 14.
a3 O-O 15. g4 e5 16. Qe4 exd4 *
Position (FEN): r4rk1/pp1bqppp/2p5/3n4/3pQ1PP/P2B4/1PP1N3/2KR1R2 w - - 0 17
White to move.
Themes: Kingside Attack Middlegame Mate in 1 
Puzzle rating: 855
Best move: Qxh7#