Author: Vincent Diepeveen
Date: 04:06:30 10/16/02
Go up one level in this thread
On October 16, 2002 at 06:52:17, Gian-Carlo Pascutto wrote: >On October 16, 2002 at 06:39:08, Vincent Diepeveen wrote: > >>On October 16, 2002 at 06:37:40, Thorsten Czub wrote: >> >>>On October 16, 2002 at 06:33:39, Gian-Carlo Pascutto wrote: >>> >>>>It uses (I wouldn't say wastes) quite a bit of resources, >>>>but there is also a gain. I find that it is almost perfectly >>>>breaking even for me. I search less deep, but I am seeing >>>>some deep tactics and avoid getting into some dangerous >>>>situations. >>> >>>really ?! >>> >>>interesting. >>> >>>i gave up using SEX in rebel XP.... >> >>the problem of SE shows when search depths get big. >>GCP is basically testing at bullet levels and then you don't >>get search depths of 12+ ply soon. > >I don't notice them worsening things at longer time controls >either, but then again, I've never been a very deep searcher, >though things are changing. > >I also understand that you do the full Hsu thing, so your >overhead must be a lot bigger. I do way more. I can do way more. The nonsense lines get pruned by nullmove. In Hsu's creations they were not. >If I find that with increasing hardware speed/slower timecontrols >it does start getting worse, I will uncheck the 'singular extensions' >checkbox and problem solved :) > >>In DIEP the price of SE is basically getting too big at those depths. > >I gather from this you won't be using them this weekend? Or is >90m SD also 'bullet'? I am talking about the crucial 12 ply search depth for DIEP. I will be getting about 10-12, so the weakest spot is those 10 ply searches. There i will be using SE. My overhead at 10 ply is about half a ply for SE. But at 12 ply it can be easily 2 ply. Doesn't need to be so. Nullmove sometimes powerful prunes away the stuff in quiet positions. It's the tactical positions where sometimes even a 11 ply search depth has plies overhead. SE is a very stupid extension in fact. I am sure in the far future it's too stupid to let your b.f. worsen with it. It makes my b.f. simply a lot worse. With 3 ply reduction however the worsening starts not directly. Because in the root i don't do 'em and the last 3 ply i don't do them. So i save 4 ply. It's trivial that at 12 ply you feel it for 8 ply and at 10 ply you 'just' feel it for 6 ply. In other words it's % from 10 ply is 60% of search depth. At 12 ply it's 75% of total search depth. That triggers more. Suppose in a few years we all get 15 ply. For me within 1 year perhaps (if i get some processors from NWO to use). I can't afford SE then simply. DB never was tested very well, let's be realistic here. Otherwise he might have kicked it out too and would have gotten more nodes a second then. >-- >GCP
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