What is the correct move for Black?

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Analysis of aherring74 (1960) vs. john2001plus (1922)

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 d6 3. d4 cxd4 4. c3 Nf6 5. Bd3 Nc6 6. cxd4 Bg4 7. Be3 Bxf3 8. Qxf3 Qb6 9. Nd2 Nxd4 10. Bxd4 Qxd4 11. O-O e6 12. e5 Nd7

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