Author: Uri Blass
Date: 09:50:35 10/04/00
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On October 04, 2000 at 10:23:48, Robert Hyatt wrote: >On October 04, 2000 at 08:44:44, Mike Adams wrote: > >>I just want to point out what i'm told, correct me if i'm wrong. A better >>evaluate helps an engine search deeper because it begins to distinguish more >>between good and bad moves when no obvious material gaining moves are available. >> The more it can differentiate moves the more alpha beta cutoffs it can get >>which means less nodes searched for a given depth and consequently more time >>spent getting more depth. Also as in the case of this game were pulsar made bad >>decisions a good evaluate can both defend against the opponents tactics and >>create tactical possiblities. > > >I don't buy that. Evaluation slows you down. No evaluation at all will >search the perfect game tree, node-wise. Adding evaluation will begin to >make move ordering get worse. Which will expand the tree, not contract >it. Matrial-only will search the smallest tree, assuming you do a decent >job of ordering captures. I agree that evaluation will slow you down if you are interested only in depth but it does not say that it will slow you down if you are interested in seeing tactics faster. Evaluation can help you to see tactics because it can help you to search the right lines. With bad evaluation you may prune good lines because of null move pruning when good evaluation is not going to prune the same lines because the good evaluation will tell you that there is a threat. In most cases with material only evaluation there is no problem of losing material so the order is perfect because of the bad evaluation but the question is what happens in cases when there is a tactical idea. The fact that you can get bigger depth with material only evaluation in most of the positions does not prove that material only evaluation does the program better in tactics and the question is what happens in cases that there is a win of material for one side. Uri
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