Author: Robert Hyatt
Date: 19:39:12 01/14/99
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On January 14, 1999 at 19:41:04, syed wrote: >I thought the only place you could do an eval was at the terminal nodes. If you >plan to do it somewhere in the middle wouldn't it interfere with your backed up >scores? > >syed not necessarily. IE if you do an 8 ply search, you _could_ do your eval at ply=5, and just pass that value down ply by ply to the ply=8 terminal position where it could be backed up normally. And it could be updated as it is passed down if something significant happens to the position. I believe that (at least at some point) Wchess was doing this... > >On January 14, 1999 at 17:49:15, KarinsDad wrote: > >>I have been considering the possibility of having two sets of evaluation >>routines in my code. One set is a quick simplistic evalution and the other is a >>slower, more detailed evaluation. >> >>The simplistic evaluation consists of any set of data which can quickly be >>calculated such as material and safe squares. I was also going to have my pawn >>structure score here as well since I am using one large hash table for it, >>hence, since pawn structures are relatively stable and once calculated, they can >>be re-used for multiple positions across the search tree. >> >>The detailed evaluation was going to consist of the simplistic evaluation, plus >>modified piece values (based on where they are and what they are doing), square >>control, king safety, etc. >> >>My questions are: >> >>1) Has anyone used an approach similar to this, and if so, is it successful? and >>2) If I use this approach, where should I use each evaluation? I was thinking of >>using the detailed evaluation only on the first few ply (maybe up to 4), on the >>entire PV, and at the leaf nodes of non-quiescent paths (once they became >>relatively quiescent again). I would then use the simplistic evaluation >>everywhere else for speed. Does this seem reasonable, or am I missing something >>here? Will having scores derived from two different evaluations result in a >>skewing of the search? >> >>Thanks, >> >>KarinsDad
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