Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Been-Koomen_Variation
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5 5. e3 Nc6 6. Nf3 h6 7. Bh4 cxd4 8. exd4
Be7 9. Be2 O-O 10. O-O a6 11. Rc1 Bd7 12. a3 dxc4 13. Bxc4 Rc8 14. Bb3 Na5 15.
Bc2 Nc4 16. Rb1 Nd5 17. Qd3 Bxh4 *
Position (FEN): 2rq1rk1/1p1b1pp1/p3p2p/3n4/2nP3b/P1NQ1N2/1PB2PPP/1R3RK1 w - - 0 18
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 485
Best move: Qh7#