What is the best continuation for Black?

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Analysis of CraigVanest (1106) vs. john2001plus (1913)

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

(black to move) 1. c4 d5 2. d4 e6 3. e3 Nf6 4. Nf3 c5 5. Bd2 Nc6 6. Be2 dxc4 7. O-O cxd4 8. Bxc4 dxe3 9. Bxe3 Qa5 10. Nbd2 Be7 11. a3 O-O 12. Qc2 e5 13. b4 Qc7 14. b5 e4 15. Nxe4 Nxe4 16. Qxe4 Na5

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Click here for 15. Ng5.
Click here for 15. Ne1.