Chess puzzle (Checkmate)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nge7 4. d4 exd4 5. Nxd4 a6 6. Bxc6 Nxc6 7. Nxc6 dxc6
8. Qxd8+ Kxd8 9. O-O Be6 10. Bf4 Kc8 11. Nd2 b6 12. c4 Kb7 13. b3 f6 14. Rac1
Ba3 15. Rcd1 Rad8 16. Nb1 Be7 17. Nc3 Rxd1 18. Rxd1 Rd8 19. Rxd8 Bxd8 20. f3
Be7 21. Kf2 b5 22. cxb5 cxb5 23. Ke2 c5 24. Kd3 Kc6 25. Be3 c4+ 26. bxc4 Bxc4+
27. Kc2 b4 28. Nd5 Bd6 29. g3 Bxa2 30. Nf4 b3+ 31. Kb2 Be5+ 32. Ka3 Bd6+ 33.
Kb2 a5 34. Ne2 a4 35. Nd4+ Kb7 36. f4 a3+ 37. Ka1 Bb4 38. Ne2 Kc6 39. Bd4 Kb5
40. e5 fxe5 41. Bxe5 g6 42. g4 Kc4 43. f5 gxf5 44. gxf5 Kd3 45. Nc1+ Kc2 46.
Nxa2 b2+ 47. Bxb2 *
Position (FEN): 8/7p/8/5P2/1b6/p7/NBk4P/K7 b - - 0 47
Black to move.
Themes: Advanced Pawn Endgame Mate in 1 
Puzzle rating: 805
Best move: axb2#