Chess puzzle (Advantage)
Moves: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Nxc6 bxc6 6. Bd3 d5 7. e5 Nd7 8.
Bf4 Nc5 9. O-O Nxd3 10. cxd3 g6 11. d4 Bg7 12. Re1 O-O 13. Nd2 Re8 14. Nf3 f6
15. Qd2 Bg4 16. exf6 Rxe1+ 17. Nxe1 Qxf6 18. Be5 Qe7 19. Bxg7 Qxg7 20. f3 Bf5
21. Rc1 Qf6 22. Nc2 Rb8 23. b3 Rb5 24. Nb4 Rb6 25. Qc3 Bd7 26. Nd3 Ra6 27. Ne5
Qf5 28. Nxd7 Qxd7 29. a4 Rb6 30. b4 Qd6 31. b5 cxb5 32. axb5 Rxb5 33. Qxc7 Qxc7
34. Rxc7 a5 35. Ra7 Kf8 36. Kf2 h5 37. Ke3 Ke8 38. Kf4 Kd8 39. Ke5 Kc8 40. Ra8+
Kb7 41. Rd8 *
Position (FEN): 3R4/1k6/6p1/pr1pK2p/3P4/5P2/6PP/8 b - - 9 41
Black to move.
Themes: Defensive Move Endgame, Rook Endgame  
Puzzle rating: 1560
Best move: a4