Chess puzzle (Checkmate)
Moves: 1. d4 e6 2. Bf4 b6 3. Nf3 Bb7 4. e3 a6 5. Be2 d6 6. O-O Nd7 7. Nbd2 h6 8. c3 g5
9. Bg3 Be7 10. h3 h5 11. Bh2 g4 12. Ne1 gxh3 13. g3 h4 14. Bf3 Bxf3 15. Nexf3
Nh6 16. Nxh4 Bxh4 17. gxh4 Qxh4 18. Qf3 Rg8+ 19. Kh1 d5 20. Rg1 O-O-O 21. Rxg8
Rxg8 22. Rg1 Ng4 23. Bg3 Qh5 24. Nf1 h2 25. Nxh2 Ndf6 26. Kg2 Rh8 27. Nxg4 *
Position (FEN): 2k4r/2p2p2/pp2pn2/3p3q/3P2N1/2P1PQB1/PP3PK1/6R1 b - - 0 27
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1539
Best move: Qh3#