Chess puzzle (Checkmate)
Moves: 1. e4 e6 2. d4 d5 3. exd5 exd5 4. Bd3 Bd6 5. Nf3 Ne7 6. O-O O-O 7. c3 Bf5 8.
Bg5 Bxd3 9. Qxd3 Qd7 10. Nbd2 Qf5 11. Qxf5 Nxf5 12. Rae1 f6 13. Bh4 c6 14. Bg3
Bxg3 15. fxg3 Na6 16. Nh4 Nd6 17. Re7 Rfe8 18. Rfe1 Kf8 19. Rxe8+ Rxe8 20. Kf2
Rxe1 21. Kxe1 g6 22. Kf2 Nc7 23. Ke3 Ne6 24. Kd3 Ng5 25. Nhf3 Nge4 26. c4 Nf2+
27. Kc3 Nd1+ 28. Kb3 dxc4+ 29. Nxc4 Nxc4 30. Kxc4 Ne3+ 31. Kc5 Ke7 32. Ne1 Kd7
33. b4 *
Position (FEN): 8/pp1k3p/2p2pp1/2K5/1P1P4/4n1P1/P5PP/4N3 b - - 0 33
Black to move.
Themes:  Endgame, Knight Endgame Mate in 1 
Puzzle rating: 823
Best move: b6#