Chess puzzle (Crushing)
Moves: 1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Nxf6+ gxf6 6. Be3 Qb6 7. Qc1 Qc7
8. Qd2 Nd7 9. O-O-O Rg8 10. Ne2 e5 11. Ng3 Nb6 12. Ne4 Be7 13. dxe5 fxe5 14.
Nd6+ Bxd6 15. Qxd6 Qxd6 16. Rxd6 Rg6 17. Rxg6 hxg6 18. Bxb6 axb6 19. Bc4 b5 20.
Bb3 Ke7 21. Re1 Kf6 22. a3 Bf5 23. f3 Re8 24. g4 Be6 25. Bxe6 Kxe6 26. f4 Kf6
27. h3 Re7 28. fxe5+ Rxe5 29. Rf1+ Ke6 30. Kd2 Rd5+ 31. Ke3 f5 32. gxf5+ Rxf5
33. Rg1 Kf6 34. Rg4 Rh5 35. h4 Re5+ 36. Kf3 Rf5+ 37. Rf4 Ke5 38. Rxf5+ Kxf5 39.
c3 c5 40. b3 b6 41. b4 *
Position (FEN): 8/8/1p4p1/1pp2k2/1P5P/P1P2K2/8/8 b - - 0 41
Black to move.
Themes: Defensive Move, Zugzwang Endgame, Pawn Endgame  
Puzzle rating: 1750
Best move: c4