Chess puzzle (Crushing)
Moves: 1. d4 d5 2. c4 e6 3. Nf3 c5 4. cxd5 exd5 5. dxc5 Bxc5 6. e3 Be6 7. Bb5+ Nc6 8.
Qa4 Ne7 9. O-O O-O 10. Nd4 Qa5 11. Nxc6 Qxa4 12. Bxa4 Nxc6 13. Bxc6 bxc6 14.
Nc3 a6 15. Bd2 Rfb8 16. Na4 Be7 17. b4 Bxb4 18. Bxb4 Rxb4 19. Nc5 Rb6 20. Rab1
Rab8 21. Nxa6 *
Position (FEN): 1r4k1/5ppp/Nrp1b3/3p4/8/4P3/P4PPP/1R3RK1 b - - 0 21
Black to move.
Themes:  Endgame  
Puzzle rating: 1014
Best move: Rxb1