Author: Dann Corbit
Date: 20:31:08 10/25/05
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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
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