Chess puzzle (Crushing)
Moves: 1. Nf3 d5 2. d4 Nc6 3. c4 dxc4 4. d5 Nb8 5. e4 Bg4 6. Bxc4 Bxf3 7. Qxf3 a6 8.
d6 e6 9. e5 Nc6 10. Bf4 cxd6 11. exd6 Bxd6 12. Nc3 Bxf4 13. Qxf4 Qf6 14. Qc7
Rb8 15. Bxa6 Qe5+ 16. Qxe5 Nxe5 17. Bb5+ Ke7 18. O-O Nf6 19. Rfe1 Nc6 20. f4
Nd4 21. Rac1 Nxb5 22. Nxb5 Rhc8 23. Nc3 Rc6 24. f5 Rbc8 25. fxe6 fxe6 26. g4
Nxg4 27. Nd5+ Kd6 28. Rxc6+ bxc6 29. Nf4 e5 30. Rd1+ Ke7 31. Nd3 Rd8 32. h3 Nf6
33. Nf2 Rxd1+ 34. Nxd1 Kd6 35. Kf2 Nd5 36. Kf3 Nb4 37. a3 Nd3 38. Ke3 Nc5 39.
b4 Na4 40. Ke4 g6 41. Ne3 Nc3+ 42. Kd3 Nb1 43. a4 c5 44. b5 Na3 45. b6 Kc6 46.
Nd5 c4+ 47. Kc3 e4 48. a5 Kxd5 *
Position (FEN): 8/7p/1P4p1/P2k4/2p1p3/n1K4P/8/8 w - - 0 49
White to move.
Themes: Advanced Pawn Endgame, Knight Endgame  
Puzzle rating: 946
Best move: b7