Author: Uri Blass
Date: 07:45:49 10/17/05
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On October 17, 2005 at 10:30:21, Thomas Logan wrote: >On October 17, 2005 at 10:10:58, Uri Blass wrote: > >>I am now surprised by the big drop in the CEGT rating of my Fruit personality. >> >>It was already 2806 after 92 games and now it is 2748 after 223 games. >> >>I also remember possible error of 61 elo after 92 games but even if the real >>rating is 61 elo lower than 2806 then I still do not expect the rating to change >>so fast. >> >>This is surprising also because results that I read earlier not by CEGT >>supported my personality. >> >>I wonder if the real error is not higher than the error that is written >> >>I wonder what is the reason for the big drop and if there was no problem in the >>matches against spike and Jonny that seem to be the main reason for the drop in >>my personality(did the same tester play these matches?). >> >>possible source of mistakes in the results. >> >>1)testing in different hardware relative to previous fruit. >> >>The claim of the CEGT is that they test with hardware that is equivalent to 2 >>ghz PIV but the problem is that there is no equivalence and it is possible that >>one program likes more one processor and not another processor. >> >>2)testing different positions and not the same positions that were tested by >>earlier version. >> >>3)testing against different opponents. >> >>Uri > >Hi Uri > >What personality is that ? > >Was it released ? > >Tom This personality is reducing the history threshold from 70 to 50. It was discussed earlier in this forum. No more changes except that change. I simply analyzed some of Fruit's games and found that reducing the threshold to 50 could prevent some mistakes of fruit because fruit can find the right move faster with history threshold=50. I did not test it in games but people not from CEGT who tested it in blitz reported good result and the idea to change it from 70 to 50 was based on analyzing long time control games and not based on analyzing blitz games. Uri
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