Chess puzzle (Checkmate)
Moves: 1. g3 d5 2. Bg2 Nf6 3. h3 g6 4. a3 Bg7 5. e3 c5 6. d3 Nc6 7. Qe2 Qb6 8. b3 d4
9. e4 Ne5 10. f4 Nc6 11. g4 e5 12. f5 Bd7 13. g5 Nh5 14. Qf3 O-O-O 15. Nd2 Bf8
16. Nc4 Qc7 17. Ne2 Be7 18. h4 b5 19. Nb2 Bd6 20. Bh3 Na5 21. fxg6 fxg6 22.
Bxd7+ Qxd7 23. Ng3 Rhf8 24. Qg2 Nf4 25. Qg1 Qg4 26. Bd2 Nc6 27. a4 Nb4 28. Rc1
Bc7 29. axb5 Ba5 30. Nc4 Nbxd3+ 31. cxd3 *
Position (FEN): 2kr1r2/p6p/6p1/bPp1p1P1/2NpPnqP/1P1P2N1/3B4/2R1K1QR b K - 0 31
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1401
Best move: Nxd3#