Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Marshall_Defense
Moves: 1. d4 d5 2. c4 Nf6 3. cxd5 Nxd5 4. e4 Nf6 5. Nc3 Nc6 6. Nf3 e6 7. e5 Nd5 8. Bd3
Bb4 9. Bd2 Bxc3 10. bxc3 O-O 11. O-O g6 12. Bh6 Re8 13. Bg5 Qd7 14. c4 Nde7 15.
Bf6 Nf5 16. Bxf5 exf5 17. Qd2 Nxe5 18. Qh6 Ng4 *
Position (FEN): r1b1r1k1/pppq1p1p/5BpQ/5p2/2PP2n1/5N2/P4PPP/R4RK1 w - - 2 19
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 760
Best move: Qg7#