What is the strongest continuation for Black?

Casual Game, https://itsyourturn.com
Analysis of keith28 vs. John Coffey

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

(black to move) 1. d4 Nf6 2. d5 e6 3. dxe6 fxe6 4. Nc3 Bb4 5. Bd2 O-O 6. g3 d5 7. Bg2 c5 8. e3 Nc6 9. h3 e5 10. Nge2 d4 11. exd4 cxd4 12. Ne4 Nxe4 13. Bxe4 Qf6 14. f4 Bc5 15. c3 exf4

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Pawn promotion:
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