What is the best continuation for Black?

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Analysis of Gusev (1827) vs. john2001plus (1959)

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. f3 Qb6 8. Qd2 Nxe4 9. Nxc6 Nxd2 10. Bxb6 Nxf1 11. Bd4 Bxd4 12. Nxd4 Ne3 13. Kf2 Nxc4 14. b3 Ne5 15. Nc3 O-O 16. Rad1 d6 17. h3 Bd7 18. Rhe1 Rac8 19. Ne4 f5 20. Ng5 h6 21. Nge6 Bxe6 22. Nxe6 Rc2+ 23. Kg1 Rfc8 24. f4 Nd7 25. a4 Rb2 26. Nd4 Kf7 27. Re3 Nf6 28. g3 Rc5 29. Rde1 Nd5 30. Re3e2 Rxe2 31. Nxe2 Rc2

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