What is the strongest continuation for Black?

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Analysis of Gusev (1784) vs. john2001plus (1935)

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

(black to move) 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 c5 5. dxc5 Bxc5 6. Nf3 Ne4 7. O-O Qb6 8. e3 O-O 9. cxd5 Rd8 10. Qc2 exd5 11. Nc3 Nxc3 12. Qxc3 Bb4 13. Qb3 Nc6 14. Bd2 Bxd2 15. Nxd2 Be6 16. Qxb6 axb6 17. Nb3 d4 18. Nxd4 Nxd4 19. exd4 Rxd4 20. Bxb7 Rxa2 21. Rad1 Rxd1 22. Rxd1 Kf8 23. b4 Rb2 24. Rd4 b5 25. Kg2 Ke7 26. Kf3 Bc4 27. Bd5 Bxd5+ 28. Rxd5 Rxb4

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