Chess puzzle (Checkmate)
Opening: Blackmar-Diemer_Gambit, Blackmar-Diemer_Gambit_Ryder_Gambit
Moves: 1. d4 Nf6 2. Nc3 d5 3. e4 dxe4 4. f3 exf3 5. Qxf3 Bg4 6. Qxb7 Nbd7 7. Nb5 Rc8
8. Bf4 e5 9. dxe5 Nc5 10. Qxa7 Nfe4 11. Qa5 Qh4+ 12. Bg3 Qg5 13. Nxc7+ Rxc7 14.
Qxc7 *
Position (FEN): 4kb1r/2Q2ppp/8/2n1P1q1/4n1b1/6B1/PPP3PP/R3KBNR b KQk - 0 14
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1100
Best move: Qd2#