Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Marshall_Defense
Moves: 1. d4 d5 2. c4 Nf6 3. Bg5 Ne4 4. Bh4 g5 5. Bg3 Nxg3 6. hxg3 h6 7. e3 Bf5 8.
cxd5 Qxd5 9. Nc3 Qa5 10. a3 e6 11. b4 Qb6 12. Na4 Qd6 13. Bd3 Bxd3 14. Qxd3 Qc6
15. Nc5 Qxg2 16. Qb5+ Nc6 17. Qxb7 Rb8 18. Qxc7 Qxh1 *
Position (FEN): 1r2kb1r/p1Q2p2/2n1p2p/2N3p1/1P1P4/P3P1P1/5P2/R3K1Nq w Qk - 0 19
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1303
Best move: Qd7#