Author: Sune Fischer
Date: 02:59:16 02/27/04
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On February 27, 2004 at 05:43:48, Uri Blass wrote: >I can add that I also have discontinuity and I see no special problems with it. >I also have discontinuity from middlegame to endgame and I have different piece >square tables for the king in the middle game and the endgame. I think what could be a potential problem is if you create a zig-zag behavior of the scores. If you use a very un-smooth eval there is a chance it will create local optimums here and there and the engine can get stuck in one of those if the search can't see beyond to a better optimum. It might also destabilize the search, not sure about that :) Bob might be right that discontinuites can be a trouble maker in this respect. >It is possible that I can do my program better by not doing it. >The problem is that changing things without bugs is not a simple task when the >piece square table score is part of the evaluation that is changed incrementally >after every move(I thought when I started to have incremental evaluation but I >gave up that idea not because I think that it is a bad idea but because I do not >consider myself good enough to implement things fast without bugs but part of >the incremental evaluation is still there and I did not get rid of it when only >the rest of the evaluation is calculated from scratch at every node). > >Movei does not use a lot of time for the evaluation so maybe it may be better to >get rid of all the incremental evaluation. I don't use incremental eval, not even piece squares :) -S. >Uri
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