Author: Günther Simon
Date: 02:59:39 10/08/05
Go up one level in this thread
On October 08, 2005 at 04:58:22, Gabor Szots wrote:
>On October 08, 2005 at 04:42:35, Günther Simon wrote:
>
>>On October 08, 2005 at 04:05:05, Gabor Szots wrote:
>>
>>>On October 08, 2005 at 03:53:54, Günther Simon wrote:
>>>
>>>>On October 08, 2005 at 03:42:17, Gabor Szots wrote:
>>>>
>>>>>Here is another example of the List 512 EGTB bug. Anyone knows if this will ever
>>>>>be fixed? Or is it already fixed but will never be released?
>>>>>
>>>>>Shall I use List without EGTB's?
>>>>>
>>>>>Can the author be contacted?
>>>>>
>>>>>[Event "45 Minuten/Partie + 15 Sekunden/Zug"]
>>>>>[Site "Engine Match"]
>>>>>[Date "2005.10.07"]
>>>>>[Round "1"]
>>>>>[White "Ruffian 2.1.0"]
>>>>>[Black "List 512"]
>>>>>[Result "1/2-1/2"]
>>>>>
>>>>...
>>>>>0s} Rg1 {+M-1381/31 0s} 117. Ka3 {-M1/1 0s} Rg2 {+M-1380/31
>>>>>0s} 1/2-1/2
>>>>>
>>>>>Gábor
>>>>
>>>>The author knows the problem since very long(> 1 year at least), but he never
>>>>released a public fix. Since I know the bug I let List always play without
>>>>tablebases, because then it won't be unable to mate the lone King.
>>>>(Contacting the author again for this matter is useless...)
>>>>
>>>>Guenther
>>>
>>>I am also aware of the problem for a long time. However, I used to have the
>>>attitude that if the author says that his engine is EGTB capable then I will use
>>>EGTB's for that engine. If it has bugs, it shall pay for it. The same is true
>>>e.g. for Betsy, it's been losing a lot of games due to an EGTB bug making her
>>>sacrifice all her pieces.
>>>
>>>Gábor
>>
>>
>>No one is forced to run a program into a known bug, which can be easily
>>avoided.(Like eg. for LG Evolution with big book...)
>
>That's true. It is a hard decision. But no one is forced to implement EGTB
>support either...
>
>>
>>(never heard of your Betsy bug BTW)
>
>
>Aha! So you don't read my reports on SzG Swiss... :-)
>
>Gábor
You are right! I also found 2 examples in 63 RWBC games with Betsy 6.51:
The first example was already with new WB and scores saved, thus I can see
that Betsy played the losing move with positive! mate score, just to 'see'
a few moves later that the mate scores are against it!
It seems therefore Betsy somehow screws up the score sign for tbs mates?
Anyway, I believe the author stopped development and I will save Betsy
from tablebases in the future ;)
Thanks for a new bug for my huge collection Gabor and Olivier.
Guenther
Qf5?? -+
[D]8/8/5pk1/2q5/K3PQ1P/8/8/8 w - - 0 104
...Rxe5?? +-
[D]8/8/5kp1/4R2p/4rP1K/6PP/8/8 b - - 0 66
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