What is the strongest continuation for Black?

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Analyze soitgoes317 (1727) vs. john2001plus (1909)

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

(black to move) 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Bc4 O-O 8. f3 Qb6 9. Bb3 Nxe4 10. Nxe4 Bxd4 11. Bxd4 Qxd4 12. Qe2 Qxb2 13. Rd1 d6 14. O-O Kg7 15. Qe3 Bf5

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