What is the best move for Black?

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Analysis of john2001plus (1832) vs. Zigwurst (1918)

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

(black to move) 1. Nf3 Nf6 2. d4 d5 3. c4 e6 4. Nc3 Bb4 5. Bg5 c5 6. cxd5 exd5 7. e3 Nc6 8. dxc5 h6 9. Bxf6 Qxf6 10. Rc1 O-O 11. a3 Bxc3+ 12. Rxc3 Bg4 13. Be2 Rfe8 14. O-O a5 15. h3 Bf5 16. Nd4 Nxd4 17. exd4 Re4 18. Rd3 Rh4 19. Rf3 Rxd4 20. Qb3 Qe5 21. Qxb7 Rf8 22. Re3 Re4 23. Rxe4 Bxe4 24. c6 d4 25. Qd7 Bf5 26. Qa7 Qxe2

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