Author: Uri Blass
Date: 00:11:22 09/15/00
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On September 14, 2000 at 13:42:49, Ed Schröder wrote: >In the upcoming Rebel Century 3.0 I have implemented a little >statistic routine that reveals something about the nature of SEARCH >that could be important for the future of computer chess in the sense >that it says "something" one may expect in the near future because >of faster and faster PC's. > >Research on this issue have already been done by Bob and Ernst and >it has made me curious so I have spend a little time on it. The >statistic shows 2 things: > >a) number of fail-low's for each depth; >b) number of "changed moves" for each depth. > >(a) is not so important as often fail-low's do not mean anything but I >wanted to know anyway. > >(b) is extremely important as it shows for each depth how many times >Rebel changed its mind. As you can see in the below statistic the % >diminish and diminish the deeper Rebel goes. > >How to read the overview: >- first column: iteration depth; >- second column: number of times the depth was reached; >- third column: number of fail-low's; >- fourth column: percentage of fail-low's; >- Fifth column: number of changed moves; >- Last column: percentage of changed moves; 1)I think that the interesting question is if there is a diminishing return from time and not if there is a diminishing return from plies. I think that the following data may be interesting when you use fixed time of 2^n seconds per move(you can choose n) column 1:number of changed moves between 1 seconds and 2 seconds column 2:number of changed moves between 2 seconds and 4 seconds column 3:number of changed moves between 4 seconds and 8 seconds column n:number of changed moves between 2^(n-1) seconds and 2^n seconds 2)You can use the same idea without fixed time in normal games when you have also column for the number of cases that you used at least 2,4,8...seconds but in this case I expect the last column to have relatively more changes because you use more time when you fail low and the small number of cases are not random positions. In this case column 1 should be read like this: The number of changed moves between 1 seconds and 2 seconds out of the cases that you used at least 2 seconds. In this case there should be also more columns of the number of cases that you used at least 2 seconds(4,8,...). Uri
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