Chess puzzle (Crushing)
Moves: 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qd8 4. d4 c6 5. Be3 Nf6 6. Bc4 Bf5 7. Nf3 e6 8.
Nh4 Bg4 9. Nf3 Bb4 10. h3 Bh5 11. O-O Bxc3 12. bxc3 Ne4 13. Qd3 Bg6 14. Ne5 Nc5
15. Qd2 Ne4 16. Qe1 b5 17. Bd3 Nd6 18. Nxg6 hxg6 19. Qe2 Nd7 20. c4 bxc4 21.
Bxc4 Nf5 22. Bb3 Nb6 23. Rad1 a5 24. d5 cxd5 25. Bxb6 Qxb6 26. Bxd5 Rd8 27. Bb3
O-O 28. Rxd8 Rxd8 29. Rd1 Rxd1+ 30. Qxd1 Ng3 31. Qf3 Nf5 32. a4 Qb4 33. Qd1 Nd4
34. Qd3 Nxb3 35. cxb3 Qe1+ 36. Qf1 Qc3 37. Qb5 Kf8 38. Qb8+ Ke7 39. Qb7+ Kf6
40. Kf1 Qd3+ 41. Ke1 Qc3+ 42. Ke2 Qc2+ 43. Kf3 Qd3+ 44. Kg4 Qe2+ 45. Qf3+ Qxf3+
46. Kxf3 Ke5 47. Ke3 Kd5 48. Kd3 Kc5 49. Kc3 f5 *
Position (FEN): 8/6p1/4p1p1/p1k2p2/P7/1PK4P/5PP1/8 w - - 0 50
White to move.
Themes: Defensive Move Endgame, Pawn Endgame  
Puzzle rating: 1840
Best move: f4