What is the strongest continuation for Black?

Casual Game, https://itsyourturn.com
Analysis of Schulze vs. John Coffey

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

(black to move) 1. f4 e5 2. d4 exd4 3. Qxd4 Nc6 4. Qe4+ Be7 5. f5 Nf6 6. Qf4 O-O 7. Nf3 d5 8. Nc3 Bd6 9. Qh4 Nb4 10. Kd1 Bxf5 11. Bg5 Bxc2+ 12. Kd2 d4 13. Nxd4 Be5 14. e3 h6 15. Bxf6 Bxf6 16. Qg4 c5 17. a3 cxd4

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