Chess puzzle (Crushing)
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Bb4 5. Bd2 Nc6 6. a3 Bxc3 7. Bxc3 Ne4 8.
Qc2 O-O 9. e3 a5 10. Bd3 f5 11. O-O g5 12. Ne5 Nxe5 13. dxe5 h5 14. f3 Nxc3 15.
Qxc3 b6 16. Rad1 Bb7 17. e4 d4 18. Qc1 f4 19. Be2 c5 20. g3 Rf7 21. gxf4 gxf4
22. Kf2 Qh4+ 23. Kg1 Rg7+ 24. Kh1 Kh7 25. Rg1 Rag8 26. Rxg7+ Rxg7 27. Rg1 Qf2
28. Rxg7+ Kxg7 29. Qg1+ Qxg1+ 30. Kxg1 Kg6 31. Kg2 Kg5 32. h3 h4 33. Bd1 Kg6
34. Ba4 Kf7 35. Bb5 Ke7 36. Kf2 Bc8 37. Ke2 Bd7 38. Kd3 Kd8 39. Bxd7 Kxd7 40.
Kc2 *
Position (FEN): 8/3k4/1p2p3/p1p1P3/2PpPp1p/P4P1P/1PK5/8 b - - 1 40
Black to move.
Themes: Defensive Move Endgame, Pawn Endgame  
Puzzle rating: 2199
Best move: a4