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Subject: Re: Big Rybka Bug?

Author: Vasik Rajlich

Date: 07:53:19 02/06/06

Go up one level in this thread


On February 05, 2006 at 17:06:15, George Tsavdaris wrote:

>On February 05, 2006 at 16:55:32, Anders Göransson wrote:
>
>>played on playchess 16+0, Rybka totally missed a stalemate trick and even showed
>>mate score
>>
>

Yes, this is fixed in the upcoming Beta 13c.

Vas

> Rybka 13b calculates as best the stalemate move Bxe2 initially, but rejects it
>very quickly. In less than a second....
> So what happened it should probably be a hash issue(as Rybka thought for the
>Bxe2 in the game for 8 seconds)....Perhaps with the hash fix Vasik will do in
>the next version this problem will be solved too.
>
>Also in my PC Rybka would not play 38...h4 but 38...Rd4 with a -10.00 score
>
>6k1/5p2/4pP2/4P1p1/1r4bp/p1p5/P1P1B3/2K3R1 b - - 0 1
>
>Analysis by Rybka 1.01 Beta 13b 32-bit:
>
>39...Bg4xe2
>  -+  (-4.99)   Depth: 3   00:00:00
>39...Bg4xe2
>  -+  (-4.55)   Depth: 4   00:00:00
>39...Bg4xe2 40.Rg1xg5+ Kg8-h7
>  -+  (-3.96)   Depth: 5   00:00:00
>39...Bg4xe2 40.Rg1xg5+ Kg8-h7 41.Rg5-g7+ Kh7-h6
>  -+  (-4.02)   Depth: 6   00:00:00  3kN
>39...Bg4xe2 40.Rg1xg5+ Kg8-h7 41.Rg5-h5+ Kh7-g6 42.Rh5-g5+ Kg6-h6
>  =  (0.00)   Depth: 7   00:00:00  5kN
>39...h4-h3 40.Rg1xg4 Rb4xg4 41.Be2xg4 h3-h2 42.Bg4-f3 Kg8-h7
>  ³  (-0.45)   Depth: 7   00:00:00  5kN
>39...Bg4-h3 40.Rg1xg5+ Kg8-f8 41.Rg5-h5 Kf8-e8
>  µ  (-0.71)   Depth: 7   00:00:00  8kN
>39...Bg4-f5 40.Rg1xg5+ Kg8-h7 41.Rg5-g7+ Kh7-h6 42.Rg7xf7
>  -+  (-2.09)   Depth: 7   00:00:00  16kN
>39...Bg4-f5 40.Rg1xg5+ Kg8-h7 41.Rg5-g7+ Kh7-h6 42.Rg7xf7 Rb4-b2
>  -+  (-2.15)   Depth: 8   00:00:00  22kN
>39...Bg4-f5 40.Rg1xg5+ Kg8-h7 41.Rg5-g7+ Kh7-h6 42.Rg7xf7 Rb4-b2 43.Rf7-c7
>  -+  (-2.36)   Depth: 9   00:00:00  35kN
>39...Bg4-f5 40.Rg1xg5+ Kg8-h7 41.Rg5-g7+ Kh7-h6 42.Rg7xf7 Rb4-b2 43.Rf7-c7
>Rb2xc2+ 44.Kc1-d1
>  -+  (-2.31)   Depth: 10   00:00:00  55kN
>39...Bg4-f5 40.Rg1xg5+ Kg8-h7 41.Rg5-g7+ Kh7-h6 42.Rg7xf7 Rb4-b2 43.Rf7-c7
>Rb2xc2+ 44.Kc1-d1 Rc2xa2
>  -+  (-2.71)   Depth: 11   00:00:01  104kN
>39...Bg4-f5 40.Rg1xg5+ Kg8-h7 41.Rg5-g7+ Kh7-h6 42.Rg7xf7 Rb4-b2 43.Rf7-c7
>Rb2xc2+ 44.Kc1-d1 Rc2xa2 45.Rc7xc3
>  -+  (-2.74)   Depth: 12   00:00:02  181kN
>39...Bg4-f5 40.Rg1xg5+ Kg8-h7 41.Rg5-g7+ Kh7-h6 42.Rg7xf7 Rb4-b2 43.Rf7-c7
>Rb2xc2+ 44.Kc1-d1 Rc2xa2 45.Rc7xc3 h4-h3
>  -+  (-2.87)   Depth: 13   00:00:03  337kN



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