Author: Miguel A. Ballicora
Date: 08:15:42 01/15/02
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On January 15, 2002 at 08:51:26, David Rasmussen wrote: >On January 15, 2002 at 08:45:21, Severi Salminen wrote: > >>>Many people use node count (or time) to order root nodes, apart from always >>>ordering the pv move of last ply first, of course. This seem to work ok. But as >>>some people have suggested (Christophe, for one), this method isn't very much to >>>the point and might have unwanted sideeffects. >> >>How is it "not to the point" and what side effects he means? For me it works. >> >>Severi > >It works for me too. > >The phrases "not to the point" and "side effects" are mine, not Christophe's. >But he has expressed similar things. It works for me and I do not care if it is indirect or whatever. Because there is a real simple way to see it is working. Measure the tree size and that's it. For me, it was significantly smaller than doing the same ordering I do in the rest of the tree. It had another positive side effect! Killers started to work! Killer did not work for me, it was a wash. When I added the root ordering, Killers added a ~15% decrease in tree size ( as far as I remember). Now the question is... is there a better way to do it? I am all ears :-) >When I said "not to the point", I meant that 'nodes used' is not a very direct >measure of the quality of a move, it's rather an indirect one. If I somehow >could get the score of each root move after an iteration, I would certainly use >that for ordering, but I can't since I use PVS. I am not sure if I agree. I do not want ordering accoring to the score, what I want is "what is the move that has more chances to beat the main move?" Sometimes, it is not the second best move (according to the evaluation after depth = X) but another move that is "promising" even though at depth X does not have a high score but it has chances to have a high one at score X + 1. For instance, attacking moves that fall just short. Regards, Miguel > >I can't name any tangible side effects, I said it "might" have side effects. > >/David
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