What is the best continuation for Black?

ICC tourney 1386 (12 3), Internet Chess Club
Analysis of tangent (1921) vs. john2001plus (1716)

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

(black to move) 1. d4 Nf6 2. c4 e6 3. g3 c5 4. d5 b5 5. Bg2 Bb7 6. e4 bxc4 7. Nc3 exd5 8. exd5 d6 9. Nf3 Nbd7 10. O-O Be7 11. Nd2 Nb6 12. Nxc4 Nxc4 13. Qa4+ Qd7 14. Qxc4 a5 15. Re1 Ba6 16. Qa4 Ra7 17. Bf4 O-O 18. Qxd7 Rxd7 19. Rxe7 Rxe7 20. Bxd6 Rd7 21. Bxf8 Kxf8 22. Na4 Rc7 23. d6 Rc8 24. Rc1 c4 25. Bf1 Rd8 26. Bxc4 Bxc4 27. Rxc4 Rxd6 28. Rc5 Ra6 29. Kf1 Ne4 30. Rb5 g6 31. Ke2 f5 32. Rb7 h5 33. f3 Nd6 34. Rc7 Nb5 35. Rc5 Nd4+ 36. Ke3 Ne6 37. Rb5 Nc7 38. Re5 Kf7 39. Kd3 Kf6 40. f4 Ne6 41. Kc4 g5 42. Kb5 Nc7+ 43. Kc4 gxf4 44. gxf4 Ne6 45. Nc5 Rc6 46. Kb5 Nd4+ 47. Kxa5 Rc8 48. Rd5 Ne2 49. Nd3 Ra8+ 50. Kb6 Ra4 51. b4 Rxa2

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