Chess puzzle (Checkmate)
Moves: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Nxc6 bxc6 6. e5 Qe7 7. Qe2 Nd5 8.
h4 a5 9. c4 Ba6 10. Rh3 g6 11. Bg5 Qb4+ 12. Qd2 Nb6 13. a3 Qxd2+ 14. Nxd2 Be7
15. Bd3 h6 16. Bf6 Bxf6 17. exf6 d6 18. Re3+ Kd7 19. Re7+ Kc8 20. Rxf7 Kb7 21.
O-O-O Raf8 22. Bxg6 Rxf7 23. Bxf7 Rf8 24. Bh5 Rxf6 25. b3 Rxf2 26. Bf3 a4 27.
Kc2 axb3+ 28. Kxb3 d5 29. cxd5 cxd5 30. Kc3 c5 31. Nb3 *
Position (FEN): 8/1k6/bn5p/2pp4/7P/PNK2B2/5rP1/3R4 b - - 1 31
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 1082
Best move: Na4#