Author: Bernd Nürnberger
Date: 05:17:31 04/03/04
Go up one level in this thread
[...] > >I think, it can also happen with pruning/extensions that depend on the bounds of >the search - for example null move. Depending on move ordering, you might search >the same position with different bounds. Perhaps once null move fails high (but >a "real" search would have shown, that that fail high is wrong). Now you search >with a slightly higher beta the same position, and the null mvoe search may not >fail high again. > >Perhaps Bernd can easily check this, by disabling null move and TTs. > >Regards, >Dieter I did this last night and as a result, I can say: the main purpose for the varying PV is the TT -- will have to check the code and if I do not find any failures I will take the different PVs as a normal behaviour (I do not like it either.) Maybe that's such an thing, I read at Bruce's site as "search instability". Greetings, Bernd
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.