Author: Daniel Shawul
Date: 04:59:22 12/16/05
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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 think it is impossible to make a smooth transition from phase to phase in all cases. For example, most evaluations change very much after a queen exchange. Most engines evaluate king safety very less if not 0 after a queen exchange. How can you avoid this? I agree that having a separate evaluation for different phases of the game is important but it is impossible to make a smooth transition in all cases. My guess: history pruning (relatively safe huge depth) + tuned evaluation >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? ;)
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