Chess puzzle (Advantage)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 b5 5. Bb3 f5 6. Nc3 f4 7. d3 d6 8. Bd5 Bd7
9. Ne2 Nf6 10. Bb3 Bg4 11. Neg1 h6 12. h3 Bh5 13. h4 g5 14. hxg5 hxg5 15. Qd2
Bg7 16. Be6 Qe7 17. Bf5 g4 18. Nh2 Nd4 19. Nxg4 Bxg4 20. Rxh8+ Bxh8 21. f3 Bxf5
22. exf5 Nxf5 23. b3 Ne3 24. Bb2 Nfd5 25. Nh3 Qh4+ 26. Ke2 Nxg2 27. Rh1 Nde3
28. Nf2 Qf6 29. Ne4 Qg7 30. Ba3 O-O-O 31. Bb4 d5 32. Nf2 Qg3 33. Rh3 Qg5 34.
Bc5 Bf6 35. Qa5 Kb7 36. a4 Nxc2 37. axb5 Nd4+ 38. Bxd4 exd4 39. bxa6+ Kc8 *
Position (FEN): 2kr4/2p5/P4b2/Q2p2q1/3p1p2/1P1P1P1R/4KNn1/8 w - - 1 40
White to move.
Themes: Advanced Pawn Middlegame  
Puzzle rating: 1198
Best move: a7