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Subject: Re: Computer Chess Xmas Stuff

Author: Walter Koroljow

Date: 05:57:47 12/27/99

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On December 26, 1999 at 21:53:27, Albert Silver wrote:

>On December 26, 1999 at 11:30:33, Walter Koroljow wrote:
>
>>After 18 games, I am losing 1.11 points per game. I have studied the game some,
>>so I am not a beginner.  It's too early to tell yet, but it seems very strong
>>(or I am very weak!).
>>
>>This is the "tutor" version and it gives numerical evaluations and suggested
>>moves when it thinks I could have played better.  It also gives evaluations of
>>positions and, in particular, all doubles.  It thinks its doubles are all well
>>considered...
>
>That's interesting. I wonder how the doubles calls were chosen? Was it the
>result of its own neural development, or does it incorporate the research of
>players like Kit Woolsey?
>I myself have only played the Jellyfish 3.5 demo, so I don't have access to this
>information. Does it say in the manual or help notes?
>
>                                      Albert Silver
>
>>
>>This is a very nice toy.  Now if I only had the time to study chess, backgammon,
>>etc., etc.
>>
>>Cheers,
>>
>>Walter

There is no manual, just a few sheets of paper.  The on-line help is good, but
does not talk about doubling theory.  When doubling, or upon request, the
program provides the following independent numerical information:

1. Probability of win, of gammon/backgammon, and of backgammon.  I assume the
"/" is a logical "or".
2. "Volatility", which is not defined.

I haven't read Kit Woolsey's analysis, but I would certainly like to someday.
Years ago I used win probability and a measure of volatility to generate
doubling strategy (just to satisfy my curiosity).  To me the hard part is
defining and getting the data.  E.g., is volatility a constant for the rest of
the game?  How much does its constancy matter?  Have people figured all these
things out already?

Cheers,

Walter



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