Chess puzzle (Crushing)
Moves: 1. d4 c5 2. d5 d6 3. e4 g6 4. Bf4 Bg7 5. Nc3 a6 6. a4 Nd7 7. Nf3 Ngf6 8. h3 Qb6
9. Rb1 Qb4 10. Bd3 Nh5 11. Bd2 O-O 12. O-O Nb6 13. g4 Nf6 14. b3 Nfd7 15. Nb5
axb5 16. Bxb4 cxb4 17. Bxb5 Ne5 18. Nxe5 Bxe5 19. f4 Bc3 20. Rf3 Nd7 21. Bxd7
Bxd7 22. Qe2 Rfc8 23. Rd1 Rc5 24. Rxc3 Rxc3 25. Rd3 Rc5 26. Kf1 b5 27. Rd4 bxa4
28. Rxb4 *
Position (FEN): r5k1/3bpp1p/3p2p1/2rP4/pR2PPP1/1P5P/2P1Q3/5K2 b - - 0 28
Black to move.
Themes:  Endgame  
Puzzle rating: 1516
Best move: a3