Chess puzzle (Crushing)
Moves: 1. e4 e5 2. Nf3 d6 3. Bc4 Bg4 4. c3 Nf6 5. O-O Nxe4 6. Re1 Nc5 7. d4 Ncd7 8.
Bxf7+ Kxf7 9. Ng5+ Qxg5 10. Bxg5 Bxd1 11. Rxd1 exd4 12. cxd4 Be7 13. Be3 Re8
14. Nc3 c6 15. d5 Na6 16. Rd4 c5 17. Rf4+ Kg8 18. Ne4 Nb4 19. Rg4 Nxd5 20. Re1
Ne5 21. Rg3 Nd3 22. Re2 Bh4 23. Rg4 Nxe3 24. fxe3 Bd8 25. Nxd6 Re6 26. Nxb7 Rb8
27. Nxd8 Rxd8 28. Rd2 Rxe3 29. h3 Rb8 30. b3 Re1+ 31. Kh2 Ne5 32. Rf4 Rf8 33.
Ra4 Ref1 34. Rxa7 R1f2 35. Rxf2 Rxf2 36. Re7 Re2 37. Kg3 Re3+ 38. Kf4 Ng6+ 39.
Kxe3 Nxe7 40. Ke4 Kf8 41. Ke5 Ke8 42. Kd6 Nf5+ 43. Kxc5 Ne3 44. g4 g5 45. a4
Kd8 46. Kb6 Nd5+ 47. Kb7 Nb4 48. a5 Nd3 49. a6 Nc5+ 50. Kb6 Nd7+ 51. Kc6 Kc8
52. b4 Nb8+ 53. Kb5 Kc7 *
Position (FEN): 1n6/2k4p/P7/1K4p1/1P4P1/7P/8/8 w - - 3 54
White to move.
Themes: Advanced Pawn Endgame, Knight Endgame  
Puzzle rating: 579
Best move: a7