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Subject: Re: 3 computer chess myths: which one has proven to be true?

Author: Jouni Uski

Date: 21:57:25 04/22/02

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On April 22, 2002 at 15:03:29, Dann Corbit wrote:

>On April 22, 2002 at 09:01:30, Jouni Uski wrote:
>
>>1. program X plays relatively better against humans than against computers
>
>Not enough evidence to say, either way.  It is easy to get hundreds of games
>with computer/computer matches, but computer verses human it is difficult to
>collect a large volume of quality data under controlled conditions.
>
>>2. program Y plays relatively better with longer time control
>
>This is surely true for some programs.  Amy at G/1 minute will be clobbered by
>TSCP.  Amy at G/5 minutes will be blasted by Wildcat.  At G/120, Amy will
>destroy them both.  On the other hand, there are definitely programs where the
>speed of play makes little or no difference in the quality of play.
>
>At some point, the branching factor of any chess program will dominate the
>quality of its play.  From that point forward, additional time will make no
>difference in the quality of play against opponents where their branching factor
>has also began to dominate.
>
>>3. there are diminishing returns from speed doubling, when search depth is
>>   increased
>
>There are conflicting results for this.  I don't think we have enough data  to
>say.
>
>>I think definitely 3. is true - only the size of diminishing is unclear. E.g.
>>from latest SSDF list (yes comp-comp play!) doubling gives only 40 points at
>>current top level against 75 previously. But 1 and 2 are still open cases.
>
>The error bar is far larger than the measurement, in this case.

??? Are You serious? The value of 40 is based on 1000s of games! Error bar is
non-existent.

Jouni




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