What is the strongest move for Black?

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Analysis of Caissarius (1853) vs. soitgoes317 (1938)

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 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Bd3 Bg7 8. Nge2 O-O 9. O-O Na6 10. a3 Nc7 11. Bg5 a6 12. a4 h6 13. Be3 Re8 14. Qd2 Kh7 15. h3 Bd7 16. g4 b5 17. Bxh6 Bxh6 18. g5 Bxh3 19. Rfe1 c4 20. Bb1 Nh5 21. gxh6 Qh4 22. Qe3 Re5 23. Ng3 b4 24. Nce2 Nxd5 25. Qd4 Ndf4 26. Nxf4 Nxf4 27. Qxd6 Rg5 28. Re3 Be6 29. Rf3 Rd8 30. Qxd8 Rxg3+ 31. fxg3 Nh3+ 32. Kh2 Qxd8

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