Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Exchange_Variation
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 Be6 6. Nf3 Be7 7. e3 O-O 8.
Ne5 Nc6 9. Nxc6 bxc6 10. Bd3 c5 11. O-O c4 12. Bb1 c5 13. Qc2 g6 14. dxc5 Bxc5
15. Na4 Be7 16. h4 Qd6 17. Qc3 Ng4 18. Bxe7 *
Position (FEN): r4rk1/p3Bp1p/3qb1p1/3p4/N1p3nP/2Q1P3/PP3PP1/RB3RK1 b - - 0 18
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 650
Best move: Qh2#