Chess puzzle (Advantage)
Moves: 1. d4 Nf6 2. e3 g6 3. Bd3 Bg7 4. c3 d6 5. f4 O-O 6. Nf3 Bg4 7. O-O Nh5 8. Qe1
Nd7 9. Qh4 Bxf3 10. Rxf3 e5 11. Qf2 f5 12. Rh3 exf4 13. exf4 Ndf6 14. Nd2 Ng4
15. Qf3 Re8 16. Qd5+ Kh8 17. Rxh5 gxh5 18. Qxf5 Re1+ 19. Nf1 Qg8 20. Qxh5 Nf6
21. Qh4 Rae8 22. g4 Qf7 23. g5 Qh5 24. Qg3 Nd5 25. g6 h6 26. f5 R8e3 27. Bxe3
Rxa1 28. Kf2 Qd1 29. Be2 Qe1+ 30. Kf3 Qxg3+ 31. Nxg3 Nxe3 32. Kxe3 Rxa2 33. Nh5
Kg8 34. f6 Bxf6 35. Nxf6+ Kg7 36. Nd5 Kxg6 37. Nxc7 Rxb2 38. Nd5 a5 39. Nf4+
Kg5 40. Nd3 a4 41. Nxb2 a3 42. Nc4 *
Position (FEN): 8/1p6/3p3p/6k1/2NP4/p1P1K3/4B2P/8 b - - 1 42
Black to move.
Themes: Advanced Pawn Endgame  
Puzzle rating: 1231
Best move: a2