lost first game in king and pawns ending

[Event "ICC"]
[Site "Internet Chess Club"]
[Date "2009.12.14"]
[White "nhkatz"]
[Black "DaBills"]
[Result "0-1"]
[WhiteElo "1250"]
[BlackElo "1403"]
[ECO "B21"]
[Opening "Sicilian"]
[Variation "Smith-Morra gambit"]
[TimeControl "120+6"]

1. e4 c5 2. d4 cxd4 3. c3 Nc6 4. Nf3 g6 5. cxd4 d5
6. e5 Bg4 7. Be2 Bg7 8. O-O e6 9. Nc3 Nge7 10. Nb5 O-O
11. Nd6 Nf5 12. Bg5 Qd7 13. Nxf5 Bxf5 14. Nh4 Rac8 15. Nxf5 exf5
16. Rc1 Na5 17. b3 Rxc1 18. Qxc1 Rc8 19. Qd2 Nc6 20. Rc1 Nd8
21. a4 Ne6 22. Bb5 Rxc1+ 23. Qxc1 Qc7 24. Qxc7 Nxc7 25. Bd7 Ne6
26. Bxe6 fxe6 27. Kf1 Bf8 28. Ke2 Bb4 29. Bd2 Bxd2 30. Kxd2 Kf7
31. Kc3 Ke7 32. Kb4 Kd7 33. Kc5 Kc7 34. b4 a6 35. b5 a5
36. b6+ Kd7 37. Kb5 f4 38. Kxa5 Kc6 39. f3 g5 40. g3 fxg3
41. hxg3 h5 42. f4 gxf4 43. gxf4 h4 44. f5 exf5 45. e6 h3
46. e7 Kd7 47. Kb5 h2 48. a5 h1=Q 49. a6 Qb1+ 50. Kc5 Qc2+
51. Kxd5 bxa6 52. b7 Qb3+ 53. Ke5 Qxb7
0-1