Naum EGTB bug

[naum]

Hi,

I discovered a potentialy important bug affecting Naum 2.1 and Naum 2.2
If you use EGTB (Nalimov) Cache size of 32, Naum may not use EGTBs at all. I managed to repeat this bug in Arena, but it may affect the other UCI GUIs too.
If the user-specified size is the same as the engine default (32MB), GUI may not send command to set the cache size. Problem is that Naum requires this command to be sent. Otherwise it will not initialize tablebases.
I created a patch that's going to fix this. It will work for all versions (2.1 and 2.2, x32, x64 and FRC).
Please download the patch from:
http://www.geocities.com/naum_chess/patch_tb_bug.zip

Unpack it to the folder with naum.exe file and run it. Do this for all naum.exe files you have.
The patch will set the engine default cache size to 1MB. This will force GUI to send the cache size command, since I hope no one is using TB cache size of 1MB (it would make engine play weaker).

Older versions of Naum use default cache size of 2MB, so those should be fine if you don't use 2MB for the EGTB cache.

Regards,
Alex

[Dr.Wael Deeb]

Hi Alex,
Does this bug appears when the EGTB cache size is different than 32 Mb

[naum]

Hi,

It happens only if you set the EGTB cache size to 32MB (for versions 2.1 and 2.2).
For older versions, it happens only if you set it to 2MB.

Regards,
Alex

[Dr.Wael Deeb]

Thanks Alex and good luck