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Up Topic Rybka Support & Discussion / Rybka Discussion / Where does the bug come from?
- By sylvain.renard.27 (**) Date 2008-08-13 12:45 Edited 2008-08-13 12:58
Many peole using Ryba MP and  Tablebases know this bug. For instance,

8/6P1/4k3/4p3/R7/4KP2/6r1/8 w - - 0 1


With Rybka 3 MP, 6 men tablebases, one can obtain :
1.Rg4 Rxg4 2.fxg4 Kf7 3.Ke4 Kg8 4.Kxe5 Kxg7 5.g5 Kg6 6.Kf4 Kh7 7.Kg3 Kg7 8.Kf3 Kf7 9.Kf4
  +-  (3.33)   Depth: 24   00:00:04  413kN, tb=238
1.Rg4 Rxg4 2.fxg4 Kf7 3.Ke4 Kg8 4.Kxe5 Kxg7 5.Kf5 Kf7 6.g5 Kg7 7.Ke5 Kg6
  +-  (3.33)   Depth: 25   00:00:06  614kN, tb=406
1.Rg4 Rxg4 2.fxg4 Kf7 3.Ke4 Kg8 4.Kxe5 Kxg7 5.Kf5 Kf7 6.g5 Kg7 7.Ke5 Kg6
  +-  (3.33)   Depth: 26   00:00:09  871kN, tb=635
???????????
The position is a draw.
I have the same problems using Shredder or Fritz GUI's.

But if I use Aquarium, many 6 men TB's, infinite analysis does not start after initializing TB's. I stop and run it again, everything is ok and I always get a correct analysis as:

[+0.00]  d=34  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 6.Kc5 Rc2 (0:10.56)
[+0.00]  d=33  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 (0:08.33)
[+0.00]  d=32  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 6.Kc5 Rc2 (0:06.33)
[+0.00]  d=31  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 (0:04.39)
[+0.00]  d=30  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 6.Kc5 Rc2 (0:03.04)
[+0.00]  d=29  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 (0:01.55)
[+0.00]  d=28  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 (0:01.24)
[+0.00]  d=27  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 (0:00.53)
[+0.00]  d=26  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 (0:00.35)
[+0.00]  d=25  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 (0:00.26)
[+0.00]  d=24  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 (0:00.19)
[+0.00]  d=23  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 (0:00.16)
[+0.00]  d=22  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 (0:00.12)
[+0.00]  d=21  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 (0:00.08)
[+0.00]  d=20  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 (0:00.05)
[+0.00]  d=19  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 6.Kc5 Rc2 (0:00.04)
[+0.00]  d=18  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 (0:00.03)
[+0.00]  d=17  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 (0:00.02)
[+0.00]  d=16  1.Ra7 Kf6 2.Ke4 Re2 3.Kd5 Rd2 4.Kc6 Rg2 5.Kd6 Rd2 6.Kc5 Rc2 (0:00.02)
[+0.00]  d=15  1.Ra7 Kf6 2.Ke4 Re2 (0:00.01)

So my question is: where does this bug come from? Maybe Microsoft Windows???
Up Topic Rybka Support & Discussion / Rybka Discussion / Where does the bug come from?

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