Author: David Rasmussen
Date: 14:09:33 01/21/02
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On January 21, 2002 at 16:00:01, Antonio Dieguez wrote: >On January 21, 2002 at 06:43:41, David Rasmussen wrote: > >>What top programs use a pre-evaluator? Specifically, does Tiger do this? >> >>/David > >what is that? It is evaluating the root position before search, and filling up piece/square tables etc. Then during evaluation in the tree, it doesn't have to do expensive evaluation, it just uses the preplanned data from the root. There can be problems if it isn't done right. For example you might score things as if the king is at g1, but 15 plies into the tree, the king might be at b1, so the scores are not correct. But it is just another design. It has advantages and drawbacks just as the normal approach. I've been thinking that not only evaluation can be done this way. You can also use it for detailed root position dependent extensions etc. and maybe even forward pruning. /David
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