Chess puzzle (Crushing)
Moves: 1. e4 c5 2. d4 cxd4 3. c3 dxc3 4. Nxc3 Nc6 5. Nf3 d6 6. Bc4 e6 7. O-O Nf6 8.
Qe2 Be7 9. Rd1 a6 10. Be3 Qc7 11. Rac1 b5 12. Bb3 Bb7 13. Nd5 exd5 14. exd5 Qd7
15. dxc6 Bxc6 16. Nd4 Rc8 17. Rc2 Bd5 18. Rxc8+ Qxc8 19. Rc1 Qd7 20. Bxd5 Nxd5
21. Nc6 O-O 22. Nxe7+ Nxe7 23. Qf3 Rc8 24. h3 Rxc1+ 25. Bxc1 d5 26. b3 d4 27.
Qa8+ Qc8 28. Qxc8+ Nxc8 29. Kf1 Ne7 30. Ke2 Nc6 31. Kd3 Kf8 32. Bb2 Ke7 33. a3
f6 34. Bxd4 Nxd4 35. Kxd4 Kd6 36. b4 f5 37. f4 g6 38. h4 h6 39. g3 h5 40. a4 *
Position (FEN): 8/8/p2k2p1/1p3p1p/PP1K1P1P/6P1/8/8 b - - 0 40
Black to move.
Themes:  Endgame, Pawn Endgame  
Puzzle rating: 713
Best move: bxa4