Here is a game played between Rybka 3 and Rybka 2.2n2. Rybka 3 played with white pieces on a 2.4 G Hz Pentium 4 processor with 512 MB of RAM. Rybka 2.2n2 was on a core 2 duo processor with 2 GB of RAM.

[Event "?"]
[Site "?"]
[Date "2008.08.31"]
[Round "?"]
[White "Rybka 3"]
[Black "Rybka 2.2n2"]
[Result "1/2-1/2"]

1. e4 d6 2. d4 g6 3. Nf3 Nf6 4. Nc3 Bg7 5. Be2 c6 6. O-O
O-O 7. a4 Nbd7 8. Qd2 Qc7 9. h3 e5 10. dxe5 Nxe5 11. Rd1 d5
12. exd5 Nxd5 13. Nxd5 cxd5 14. Qxd5 Be6 15. Qd6 Nxf3+
16. Bxf3 Qxc2 17. Be3 Bxb2 18. Rab1 Rac8 19. Bxb7 Rb8
20. Qb4 Rbd8 21. Re1 Bf6 22. Rec1 Qf5 23. g4 Qd3 24. Be4
Qa6 25. Rc7 Qe2 26. Qb5 Qa2 27. Bxa7 Rfe8 28. Bc6 Rc8
29. Rxc8 Rxc8 30. Rd1 Qc2 31. Bf3 h5 32. Be3 hxg4 33. hxg4
Rc4 34. g5 Be7 35. Qb8+ Bc8 36. Qe5 Qf5 37. Qxf5 gxf5
38. Rc1 Rxc1+ 39. Bxc1 f6 40. gxf6 Bxf6 41. Bd2 Ba6 42. a5
Kf7 43. Bg2 Ke6 44. Bf1 Bxf1 45. Kxf1 Kd7 46. Be3 Kc7
47. a6 f4 48. Bc5 f3 49. Ke1 Bc3+ 50. Kd1 Ba5 51. a7 Kb7
52. Kc2 Bd8 53. Bd4 Bg5 54. Kd3 Bh6 55. Be3 Bg7 56. Ke4 Bf6
57. Kf4 Bh4 58. Bc5 Bxf2 59. Bxf2 Ka8 60. Ke5 Kb7 61. Ke4
Ka8 62. Kxf3 1/2 - 1/2

Clearly the advantage was there for Rybka 2.2n2 with a much stronger processor and a huge amount of memory.

= Report =

Rybka 3 was able to dominate the proceedings from the beginning itself. Black had no chance of winning the game because of the superior game play of Rybka 3 who never allowed black to bounce back into the game. But as the game progressed towards the end of the middle game, Rybka 2.2n2 was able to analyse deeper because of its hardware superiority. Rybka 3 was actually winning the game but the other engine had a lucky escape.

From the result of the game it is evident that Rybka 3 on a single core CPU is stronger than Rybka 2.2n2 on a dual core system.
Anand

Hi,
Sorry for the late reply. I posted that game as an example only. It is already proved beyond doubt that Rybka 3 on a Pentium 4 is stronger or equal to any of its previous versions on a Core 2 Duo system. You may ask Larry Kaufman, one of the developers of Rybka 3. Remember that Rybka 2.2n2 had 4 times the memory I had. I think you will get more such games if you search the net. Just play a game using the two Rybkas in a same machine. You will notice the difference.
Regards,
Anand

Hi,
I think there is some problem with the engine parameters. Either change or reinstall your Shredder GUI which is known to have some problems with Rybka 3. And also try the other Rybka engines like the Dynamic one. Can you tell me about the default engine parameters set for the engine.
Regards,
Anand