Author: Svein Bjørnar Myrvang
Date: 07:21:07 10/26/05
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I suspect Fritz is very adaptive in the amount and type of knowledge it applies to a given position. (I think Franz Morsch hinted about it in an interview a while before the release of Fritz 9, but I don't remember where I read it.) In a position without pieces and no captures avalible, it's very unlikely to be any hidden deep tactics that run counter to positional knowledge. Therefore, Fritz uses all its knowledge about pawns (structure, space, etc.) and kings (activity, safety, etc.) and this slows down the search. With all the pieces on the board, there's more material to account for, true, but the position also has more scope for tactics, and so search becomes relatively more important. Pro Deo also has plenty of knowledge, but uses it less flexibly, in that all knowledge that applies to a position is always used, except when using lazy eval, and so with fewer types of material on the board, less knowledge is used. This is just a guess, of course, I'm probably way off... :)
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