What is the strongest continuation for Black?

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Gusev (1826) vs. john2001plus (1880), 300+3

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

(black to move) 1. f4 e5 2. d3 Nc6 3. e4 Nf6 4. Nf3 d5 5. exd5 Nxd5 6. fxe5 Bg4 7. d4 Bxf3 8. gxf3 Qh4+ 9. Ke2 Nxd4+ 10. Kd3 Nb4+ 11. Kc3 O-O-O 12. f4 Nb5+ 13. Bxb5 Rxd1 14. Rxd1 Qh3+ 15. Bd3 Qf3 16. Re1 Be7 17. a3 Nxd3 18. cxd3 Rd8 19. Be3 Bh4 20. Nd2 Qc6+ 21. Nc4 Bxe1+ 22. Rxe1 b5

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