Chess puzzle (Checkmate)
Moves: 1. e4 Nc6 2. f4 d5 3. e5 f6 4. d4 Bf5 5. c3 e6 6. Bd3 Nge7 7. Nf3 Qd7 8. O-O
O-O-O 9. b4 Bxd3 10. Qxd3 Nf5 11. b5 Na5 12. a4 Be7 13. Ba3 h6 14. Bb4 Bxb4 15.
cxb4 Nc4 16. Nbd2 fxe5 17. dxe5 Nce3 18. Rfc1 g5 19. a5 Kb8 20. b6 cxb6 21.
axb6 a6 22. Rc7 Qxc7 23. bxc7+ Kxc7 24. Rc1+ Kb8 25. b5 gxf4 26. bxa6 Rhg8 27.
axb7 Rxg2+ 28. Kh1 Rdg8 29. Qa6 Rxh2+ 30. Kxh2 Rg2+ 31. Kh1 *
Position (FEN): 1k6/1P6/Q3p2p/3pPn2/5p2/4nN2/3N2r1/2R4K b - - 2 31
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 853
Best move: Ng3#