Game Game 4902689
5bk1/pP1q4/6r1/1P1KB3/8/7p/P7/8 w - - 0 50
[Event "Open invite"]
[Site "http://www.redhotpawn.com"]
[Date "2008.04.21"]
[EndDate "2008.05.01"]
[Round "?"]
[White "12thMass"]
[Black "thierryhenry"]
[WhiteRating "1531"]
[BlackRating "1556"]
[WhiteELO "1531"]
[BlackELO "1556"]
[Result "0-1"]
[GameId "4902689"]
1. e4 e5 2. f4 d6 3. d4 Ng8f6 4. Nb1c3 Nb8c6 5. d5 Nc6e7 6. Bf1d3 Bc8g4
7. Ng1f3 c6 8. f5 Qd8b6 9. b3 cxd5 10. Bd3b5 Ke8d8 11. h3 dxe4 12. hxg4 exf3
13. gxf3 Ra8c8 14. Bc1b2 Rc8xc3 15. Bb2xc3 Qb6xb5 16. Qd1xd6 Nf6d7
17. O-O-O Ne7xf5 18. Qd6b8 Kd8e7 19. Rd1xd7 Qb5xd7 20. Qb8xe5 Ke7d8
21. gxf5 Bf8a3 22. Kc1b1 Kd8c8 23. Qe5a5 Qd7d6 24. b4 Qd6a6 25. b5 Qa6xa5
26. Bc3xa5 h6 27. Rh1g1 Rh8g8 28. c4 Ba3c5 29. Rg1g2 g6 30. fxg6 fxg6
31. Kb1c2 h5 32. Ba5d2 h4 33. Bd2c3 Bc5e3 34. Bc3e5 g5 35. Kc2d3 Be3c1
36. f4 g4 37. f5 h3 38. Rg2g1 Bc1a3 39. f6 Kc8d7 40. f7 Rg8g6 41. Kd3e4 Kd7e6
42. Rg1f1 Ba3f8 43. c5 g3 44. Rf1d1 g2 45. Rd1d6 Ke6xf7 46. Rd6d7 Kf7g8
47. c6 g1=Q 48. cxb7 Qg1g4 49. Ke4d5 Qg4xd7 0-1
Originally posted by 12thMassLooks like you played pretty well until the end game, but your critical mistake was 25. b5?.
Game Game 4902689
5bk1/pP1q4/6r1/1P1KB3/8/7p/P7/8 w - - 0 50
[Event "Open invite"]
[Site "http://www.redhotpawn.com"]
[Date "2008.04.21"]
[EndDate "2008.05.01"]
[Round "?"]
[White "12thMass"]
[Black "thierryhenry"]
[WhiteRating "1531"]
[BlackRating "1556"]
[WhiteELO "1531"]
[BlackELO "1556"]
[Result "0-1"]
[GameId "4902689"]
1. e4 ...[text shortened]... 6xf7 46. Rd6d7 Kf7g8
47. c6 g1=Q 48. cxb7 Qg1g4 49. Ke4d5 Qg4xd7 0-1
If instead, 25. Qxa6, then 25. ... bxa6 26. Bxg7 Rd8 or Re8 (26. ... Rg8 27. Rxh7!) 27. c3 and it doesn't look like black can hang on the the h pawn. Then, white has a passed c pawn and has an excellent end game (not sure if it's a won end game, but it's pretty close).
You're right. 25. b5? was the blunder. 25. Qxa6 was the winning move.
To continue your line, I think that the best move for black would be 26. ...Re8. But after 27. c3 Re2 28.Bd4! he will be forced to either give up his bishop or lose almost all his pawns. Clearly a win for white.