What is the strongest move for Black?

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Analysis of tspaper (1540) vs. john2001plus (1818)

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

(black to move) 1. d4 Nf6 2. Bf4 c5 3. e3 cxd4 4. exd4 Qb6 5. Nf3 Qxb2 6. Nbd2 Nd5 7. Rb1 Qxa2 8. Ra1 Qb2 9. Rb1 Qa3 10. Ra1 Qb4 11. Rb1 Qa5 12. Rb5 Qd8 13. Rxd5 e6 14. Rb5 Nc6 15. Ne4 d5 16. Ng3 a6 17. Rb1 Bd6 18. Bxd6 Qxd6 19. Be2 O-O 20. O-O b5 21. Ra1 Bd7 22. c3 Rfb8 23. Qc2 a5

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