Clusterbug?

3b4/8/p7/3pP3/1B1Pk1p1/1pK5/1P4P1/8 w - - 0 47

[Event "4th. ACCA computer chess championships"]
[Site "chessclub.com"]
[Date "2009.11.14"]
[Round "3"]
[White "Rybka, Cluster with 52 Intel Processors"]
[Black "Crafty, Intel Xeon 8 Proc 2.3 GHz 16 GB"]
[Result "1/2-1/2"]
[ECO "C78"]
[WhiteElo "2813"]
[BlackElo "2692"]
[PlyCount "134"]
[EventDate "2009.11.14"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 Bb7 7. c3 Nxe4 8. d4 exd4 9. Re1 d5 10. Ng5 Qd7 11. f3 h6 12. Nxf7 Qxf7 13. fxe4 O-O-O 14. cxd4 Na5 15. Nc3 Nxb3 16. Qxb3 Bd6 17. e5 Rhf8 18. Qc2 Be7 19. Be3 Qf5 20. Qd2 Qe6 21. a4 b4 22. Ne2 g5 23. Nc1 Rf7 24. Nb3 Rdf8 25. Rac1 Qg6 26. Qe2 Kb8 27. Na5 Qb6

• Crafty: depth = 21; eval = +1.47; nps = 19.8M; time = 77"; egtb = 0
• Rybka: depth = 20; eval = +1.19; nps = 2.3M; time = 77"

28. Nxb7 Kxb7 29. Rc2 Qe6 30. Rec1 c6 31. Rxc6 Qxc6 32. Rxc6 Rf1+ 33. Qxf1 Rxf1+ 34. Kxf1 Kxc6 35. h4 Kd7 36. hxg5 hxg5 37. Kf2 Ke6 38. Kf3 Kf5 39. Bd2 g4+ 40. Ke3 Bg5+ 41. Kd3 Be7 42. a5 b3 43. Kc3 Ke4 44. Bh6 Bd8

• Crafty: depth = 27; eval = +2.86; nps = 15.6M; time = 75"; egtb = 0
• Rybka: depth = 22; eval = +4.47; nps = 458K; time = 75"

45. Bf8 Bxa5+ 46. Bb4 Bd8

siehe Diagramm oben, Rybka spielte nun nach 41" nicht e6 sondern Ld6

47. Bd6? Kf5 48. Kxb3 Bb6 49. Bc5 Bxc5 50. dxc5 Kxe5 51. Ka3 d4 52. c6 Kd6 53. Kb4 a5+ 54. Kc4 Kxc6 55. Kxd4 Kb5 56. Kc3 a4 57. Kd2 Kc4 58. Kc2 Kd4 59. Kd2 Ke4 60. Ke2 Kf4 61. Kf2 Ke5 62. Ke3 Kf5 63. Kd2 Kf4 64. Ke2 Ke5 65. Ke3 Kf5 66. Kd2 Kg5 67. Ke3 Kf5
1/2-1/2