Author: Uri Blass
Date: 21:08:23 10/25/05
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On October 25, 2005 at 23:31:08, Dann Corbit wrote: >On October 25, 2005 at 21:39:26, Will Singleton wrote: > >>On October 25, 2005 at 19:44:58, Dann Corbit wrote: >> >>>On October 25, 2005 at 14:56:43, Will Singleton wrote: >>> >>>>On October 25, 2005 at 12:56:43, Dann Corbit wrote: >>>> >>>>>On October 25, 2005 at 12:28:07, Lar Mader wrote: >>>>> >>>>>>I realize that this is a difficult question... >>>>>> >>>>>>I'm curious about what makes Fruit 2.2 so strong. Also, it is impressive how >>>>>>quickly Fabien achieved this strength. Fritz 9 and Shredder 9 seem to be close >>>>>>to Fruit 2.2 in strength, and yet they have been in development for a much >>>>>>longer time with a lot more resources. Has anyone spent any time examining the >>>>>>2.1 source code, or have any other insights into what this program does that >>>>>>makes it so effective? >>>>> >>>>>Fabien does everything well. He is a magnificent and careful programmer. He >>>>>obviously puts a lot of effort into making things correct. He has a lot of >>>>>insight to pick out what is important and concentrate on that. >>>>> >>>>>His search is excellent and innovative. He does some things that nobody else >>>>>does. I'm not really sure how he is able to not hash the PV and still have a >>>>>stupendously fast search, but that is pretty amazing. >>>>> >>>><snip> >>>> >>>>I haven't looked at Fruit's code, but I'm interested in your pv comment. What >>>>is the difference between storing the pv to hash, and simply playing the pv out >>>>of an array? >>> >>>What is more important in move ordering than being a pv node? >> >>Perhaps I wasn't clear. afaik, the purpose of storing the pv to hash is to >>enable the pv moves to be played first. Whether you store them to hash or to a >>special pv array shouldn't matter, if you recognize a node as a pv node and play >>the pv move. >> >>If we are in agreement on that (and perhaps I'm missing something), then are you >>saying that Fruit doesn't make use of its pv for move-ordering at all? I would >>find that unusual. > >http://chessprogramming.org/cccsearch/ccc.php?art_id=354644 I only see No PV cut-off's in Fruit I do not see that he claims that he is not using the pv for move ordering. Uri
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