What is the best continuation for Black?

Indianapolis open, Chess.com
Analysis of Xun (1400) vs. Sims (1558)

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

(black to move) 1. c4 e5 2. Nc3 Nf6 3. g3 c6 4. d4 e4 5. Bg2 d5 6. b3 Bb4 7. Bd2 e3 8. fxe3 Ng4 9. Qc2 Qe7 10. a3 Bxc3 11. Qxc3 O-O 12. h3 Nf6 13. O-O-O Qxa3+ 14. Qb2 Qd6 15. g4 a5 16. c5 Qc7 17. Be1 Be6 18. Nf3 Nbd7 19. Rg1 a4 20. bxa4 Rxa4 21. Ng5 Rfa8 22. Nxe6 fxe6 23. Bc3 Ra2 24. Qb3 Ra8a3 25. Qb4 Ra4 26. Qb3 b6 27. g5 Ra2a3 28. Qb2 Ne8 29. h4 Qa7

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