Chess puzzle (Checkmate)
Opening: Blackmar-Diemer_Gambit_Accepted, Blackmar-Diemer_Gambit_Accepted_Ryder_Gambit
Moves: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Qxf3 Qxd4 6. Be3 Qd8 7. Bd3 e6 8.
O-O-O Bd7 9. Bf4 Bc6 10. Be4 Qc8 11. Nb5 Bd6 12. Bxd6 Bxe4 13. Nxc7+ Kd7 14.
Be5+ Ke7 15. Bxf6+ gxf6 *
Position (FEN): rnq4r/ppN1kp1p/4pp2/8/4b3/5Q2/PPP3PP/2KR2NR w - - 0 16
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1426
Best move: Qa3#