What is the best move for Black?

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Analysis of john2001plus (1841) vs. KingsBishop (1708)

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

(black to move) 1. g3 d5 2. Nf3 Nc6 3. Bg2 e5 4. d3 Nf6 5. O-O Be7 6. c4 Be6 7. cxd5 Bxd5 8. Nc3 Be6 9. Bd2 O-O 10. Rc1 Nd5 11. Ne4 f5 12. Nc5 Bc8 13. Qb3 b6 14. Nxe5 Nxe5 15. Bxd5+ Kh8 16. Bxa8 Bxc5 17. Bf4 Ng6 18. Be3 Bxe3 19. fxe3 Qe7 20. e4 f4 21. Qc3 Bh3 22. Rf2 Rxa8 23. gxf4 Nxf4 24. Qxc7 Qg5+ 25. Kh1 Bg2+ 26. Kg1 Bh3+ 27. Kh1 Bg2+ 28. Kg1 Nh3#

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