Chess puzzle (Crushing)
Moves: 1. d4 e6 2. c4 c6 3. Nf3 d5 4. cxd5 exd5 5. Bf4 Bd6 6. Bg3 Nf6 7. e3 Ne4 8.
Bxd6 Qxd6 9. Nbd2 Qb4 10. Rb1 Bg4 11. Be2 Qa5 12. a3 Nd7 13. O-O Bxf3 14. Nxf3
O-O 15. Qc1 g5 16. b4 Qc7 17. Nd2 f5 18. Nxe4 fxe4 19. b5 Qd6 20. Rb3 Rf6 21.
bxc6 bxc6 22. Rc3 Rh6 23. h3 Rc8 24. Bg4 Rf8 25. Bxd7 Qxd7 26. Qe1 Rf3 27. Rxc6
Qxc6 28. gxf3 Qd7 29. Qb4 exf3 30. Qb8+ Kf7 31. Rb1 Qxh3 32. Rb7+ Kg6 33. Qe8+
Kf5 34. Qd7+ Ke4 35. Qxh3 Rxh3 36. Rxa7 g4 37. Re7+ Kd3 38. a4 g3 39. fxg3
Rxg3+ 40. Kf2 Rh3 41. a5 h5 *
Position (FEN): 8/4R3/8/P2p3p/3P4/3kPp1r/5K2/8 w - - 0 42
White to move.
Themes:  Endgame, Rook Endgame  
Puzzle rating: 1147
Best move: a6