What is the best move for Black?

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yashom (1433) vs. john2001plus (1776)

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

(black to move) 1. e4 e6 2. d4 d5 3. Nd2 c5 4. Ngf3 Nf6 5. e5 Nfd7 6. c3 b6 7. Bd3 Ba6 8. Qc2 Bxd3 9. Qxd3 Nc6 10. O-O Qc7 11. a4 Be7 12. Re1 cxd4 13. cxd4 Nb4 14. Qb3 Nc2

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