What is the strongest continuation for Black?

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Analysis of Gusev (1829) vs. john2001plus (1926)

1 2 3 4 5 6 7 8 h g f e d c b a 0

(black to move) 1. d4 e6 2. c4 d5 3. g3 Nf6 4. Bg2 c5 5. e3 Nc6 6. Ne2 cxd4 7. cxd5 exd5 8. Nxd4 Bc5 9. Nb3 Be7 10. O-O O-O 11. Nc3 Be6 12. Nd4 Qb6 13. a3 a5 14. Rb1 Rac8 15. Bd2 Ne5 16. f4 Nc4 17. Qe2 Bg4 18. Bf3 Bxf3 19. Rxf3 Ne4 20. Nxd5 Qd8 21. Nxe7+ Qxe7 22. Bc3 Nxc3 23. bxc3 Nxa3 24. Rc1 Rfe8 25. Qb2 Nc4 26. Qb5 Rc5 27. Qa4 Nd2 28. Rf2 Ne4 29. Rfc2 Nxg3 30. Re1 Ne4 31. Qb3 Rec8

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