Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Marshall_Defense
Moves: 1. d4 Nf6 2. c4 d5 3. Nf3 Nc6 4. cxd5 Qxd5 5. Nc3 Qd6 6. e4 e5 7. d5 Ne7 8. Nb5
Qb4+ 9. Nd2 Kd8 10. a3 Qa5 11. d6 Nc6 12. b4 Nxb4 13. Bb2 Nc6 14. Bc3 Qb6 15.
dxc7+ Ke7 16. Nc4 Qxb5 17. Bb4+ Ke6 18. Bxf8 Rxf8 *
Position (FEN): r1b2r2/ppP2ppp/2n1kn2/1q2p3/2N1P3/P7/5PPP/R2QKB1R w KQ - 0 19
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1060
Best move: Qd6#