What is the strongest continuation for Black?

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Analysis of Gusev (1799) vs. john2001plus (1960)

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

(black to move) 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7 6. Be3 Nf6 7. Nc3 O-O 8. f3 Qb6 9. Qd2 Nxe4 10. Nxc6 dxc6 11. fxe4 Qc7 12. O-O-O Be6 13. b3 Rfd8 14. Qc2 Qa5 15. Rxd8+ Rxd8 16. Kb2 b5 17. cxb5 cxb5 18. Kb1 Rc8 19. Bd2 Bxc3 20. Bxc3 Rxc3 21. Qb2 Qb4 22. Ka1 Qc5 23. Bc4 b4 24. Rd1 Bxc4 25. bxc4 Qxc4 26. Qd2 Rc2 27. Qd8+ Kg7 28. Qd4+ Qxd4+ 29. Rxd4 Rxg2

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