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Subject: Re: likelihood instead of pawnunits? + chess knowledge

Author: Bob Durrett

Date: 07:28:07 10/26/02

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On October 25, 2002 at 19:50:05, Ingo Lindam wrote:

>On October 25, 2002 at 13:14:28, Josť Carlos wrote:
>
>>  Sounds interesting, but a real example (even if it is simple) would help. The
>>idea alone is not useful, and has been suggested in the past.
>>
>>  Josť C.
>
>Hello Jose,
>
>two very very very simple patterns might be
>
>(P+,P=,P-)(Pe4,Pg4,Nf5,pe5,pg5) = (0.5,0.3,0.2)
>(P+,P=,P-)(Pf3,Pg4,Nh2,pg5)     = (0.2,0.29,0.51)
>
>these are just two as I said very very simple pattern you might derive or
>"check" by your chessbase.
>
>Best regards,
>Ingo

This is to check to see if I understand your idea:

One could go to a very large collection of high-quality master games [Megabase]
and do some research on patterns.  For each pattern, one could first identify
all games in which that pattern occurred.  Then, in each game, one could
estimate your three probabilities at the point in the game where that pattern
first occurred.  Repeat for all patterns of interest, to produce a table of
data.  The first column of the table might be a name of the pattern and the next
three columns be your probabilities.  Additional columns might give other
statistical information such as confidence levels.  Each row would be for a
different pattern.

Am I on track so far?

One could extend this idea to identify degree of correlation between a new
pattern [which unexpectedly occurs in a game being examined or played] and one
of the patterns in your selected set of patterns.  There would have to be
criteria and a method for computing the correlation numbers.  [This could get
messy.]  The next logical step would be to compute the probabilities for the new
position.  This set of probabilities [a probability vector?] might be regarded
as being a function of the similar positions.  Generally, one would expect that
there would be several or many positions in your position database which would
be regarded as being similar enough to be considered.

Am I still on track?

Incidentally, the programmers have the trivial [? : )] task of figuring out how
to make all this work.

Back to the idea:

All of this must be done for each move.

Would you still have search algorithms?  If so, then all this maybe would have
to be done at each move in a string of moves being evaluated by the searching.

This all appears very interesting for the future computers where there might be
millions or billions of microscopic microprocessors on a single chip.  One could
have each of these microprocessors dedicated to a single pattern in your
database of patterns.

Well, my wife is hollering for me to come eat breakfast, so that's it for now.

Bob D.



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