What is the strongest continuation for Black?

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Analysis of Blues4 (2252) vs. john2001plus (1905)

1 2 3 4 5 6 7 8 h g f e d c b a -9

(black to move) 1. d4 Nf6 2. Bg5 c5 3. Bxf6 gxf6 4. d5 e6 5. c4 b5 6. e3 bxc4 7. Bxc4 Qa5+ 8. Nc3 Ba6 9. Qb3 Qb4 10. Bxa6 Nxa6 11. dxe6 fxe6 12. Qxb4 Nxb4 13. Rb1 d5

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