What is the best continuation for Black?

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Analysis of john2001plus (1870) vs. bigpawn63 (1521)

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

(black to move) 1. Nf3 d6 2. e4 e5 3. d4 exd4 4. Nxd4 Be7 5. Nc3 Nf6 6. Bc4 O-O 7. O-O Nbd7 8. f4 d5 9. Nxd5 Nxd5 10. exd5 Nb6

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