What is the strongest continuation for Black?

micjamkid vs. soitgoes317, Chess.com
Analysis of micjamkid (1648) vs. soitgoes317 (1614)

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

(black to move) 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 Bc5 5. a4 a5 6. Nbd2 O-O 7. O-O d6 8. h3 Be6 9. Bxe6 fxe6 10. Re1 Qe8 11. Nf1 Qg6 12. Be3 Bxe3 13. Nxe3 Rae8 14. c3 Nh5 15. Qb3 Rxf3 16. Qxb7 Nd8 17. Qb5 c6 18. Qb3 Nf4 19. Qd1 Rxe3 20. Qg4 Qxg4 21. hxg4 Rxe1+

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Click here for 17... Nf4.