What is the best continuation for Black?

ICC 1 0, Internet Chess Club
Analysis of MrNice (1808) vs. Sherlocked (1679)

1 2 3 4 5 6 7 8 h g f e d c b a -2

(black to move) 1. d4 d5 2. Nf3 c6 3. c3 Nf6 4. Bg5 Ne4 5. Bf4 Bf5 6. Bxb8 Rxb8 7. Nbd2 e6 8. Nxe4 Bxe4 9. Nd2 Bg6 10. e3 Bd6 11. Be2 O-O 12. Bh5 Qh4 13. Bxg6 fxg6 14. Nf3 Qf6 15. h4 e5 16. dxe5 Bxe5 17. Qe2 Bd6 18. O-O-O a5 19. a4 b5 20. axb5 a4 21. bxc6 Ba3 22. Rd2 Qxc3+ 23. Rc2 Bxb2+ 24. Kb1 Ba3+ 25. Ka2 Qb3+ 26. Ka1 Bb4 27. Rb2 Bc3 28. Kb1 Qxb2+ 29. Qxb2 Rxb2+ 30. Ka1 Rfb8 31. Rb1 Rxb1+ 32. Ka2 Ra1#

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Click here for 22. bxa3.
Click here for 24. Kd1.
Click here for 27. Rb1.
Click here for 30. Kc1.