Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 c5 7. d5 Nbd7 8. O-O
a6 9. Nd2 Rb8 10. a3 e5 11. Rb1 Ne8 12. b4 f5 13. f3 f4 14. h3 Nef6 15. Nb3 Nh5
16. Bd3 Ng3 17. Rf2 cxb4 18. axb4 b5 19. c5 dxc5 20. bxc5 g5 21. Ne2 Nxe2+ 22.
Rxe2 Nf6 23. Bd2 h5 24. Be1 Qe8 25. Na5 g4 26. Bc3 gxh3 27. Nc6 Ra8 28. Bxe5
h2+ 29. Kh1 h4 30. Kxh2 Nh5 31. Bxg7 Kxg7 32. Rd2 Qg6 33. e5 Qg3+ 34. Kh1 h3
35. Qc2 h2 36. Bh7 Kh8 37. Ne7 Rf7 38. d6 Rxh7 39. d7 Bxd7 40. Rxd7 Rg8 41. e6
Qg5 42. Nxg8 *
Position (FEN): 6Nk/3R3r/p3P3/1pP3qn/5p2/5P2/2Q3Pp/1R5K b - - 0 42
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 917
Best move: Ng3#