What is the strongest continuation for Black?

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aherring74 (2054) vs. john2001plus (1938)

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

(black to move) 1. d4 Nf6 2. Nf3 d5 3. e3 c5 4. b3 cxd4 5. exd4 Nc6 6. a3 Bg4 7. h3 Bxf3 8. gxf3 e6 9. Bb2 Bd6 10. Nc3 Rc8 11. Bd3 Nxd4 12. Nb5 Nxb5 13. Bxb5+ Ke7

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