Author: Chan Rasjid
Date: 18:33:32 12/15/05
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On December 15, 2005 at 17:44:24, Jaime Benito de Valle Ruiz wrote: >On December 15, 2005 at 17:05:00, Sergei S. Markoff wrote: > >>1) Fruit. >> >>Fruit search seems to be primitive. "History pruning" is a variation of >>well-known idea. After implementing such method in SmarThink some years ago I >>named it "history-based pruning" and then changed to "ordering-based pruning". >>The outcome of such methods very depends of whole search model, but anyway >>history pruning is not the key to Fruit strength. >> >>To my mind, the key of Fruit strength is that the "Chess is the art of >>exchange". So, Fabien's idea about flexible game stages looks to be a beautiful >>way to improve positional play. Fruit can effectively consolidate the position. >>It simply knows when to excange to improve position. I think that it's the main >>key (cumulative with very good tuning of evaluation function). I think Fruit is >>very perspective. The main line of progress for this project, to my mind, is to >>add more complicated knowledge and intellectualize a search. > >I completely agree with you. People overestimate Fruit´s search, and >underestimate its eval because it looks simple. > I cannot comment expertly. It seems to me there are not many lines in Fruit's eval(). It seems even I could add more detail terms in its eval_pattern(). So it is confirmed a good simple evaluation can make a top program. Thomas of Toga should know something and he empasized on search extention and the way of Fruit's using nullmove. Does anyone think it wrong? > >>2) Rybka >> >>Some time ago we discussed with Gian-Carlo Pascutto an idea of create special >>"SET-tables" with sets of piece-square values indexed by 1) material on the >>board; 2) king position; 3) pawn structure. Such tables can be calculated by >>analyzing a lot of games. That time I delayed my work in this area because I >>found other perspective things. >>You can see that Rybka executable contains a lot of precalculated tables. And >>also we all know that Rybka plays positional style. My version is that Rybka >>uses some variation of SET-approach. At all cases it uses some precalculated >>positional knowledge, but what sort of it? ;) > >Interesting idea. >Regards, > >Jaime The secret maybe in Rybka's readme file and some comments I read in recent threads about certain characteristic behaviour it displayed under certain circumstances and other things. Vasik, if you are here, am I totally off ? Rasjid
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