Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Semi-Tarrasch_Defense
Moves: 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 c5 5. dxc5 Bxc5 6. cxd5 Nxd5 7. Nxd5 exd5
8. e3 O-O 9. Bd3 Bg4 10. O-O Nc6 11. a3 Ne5 12. Be2 Ng6 13. h3 Bf5 14. b4 Bb6
15. Bb2 Rc8 16. Nd4 Bxd4 17. Qxd4 Rc2 *
Position (FEN): 3q1rk1/pp3ppp/6n1/3p1b2/1P1Q4/P3P2P/1Br1BPP1/R4RK1 w - - 1 18
White to move.
Themes: Kingside Attack Middlegame Mate in 1 
Puzzle rating: 550
Best move: Qxg7#