Re: [computer-go] Pattern database

[Daniel Bump <bump@xxxxxxxxxxxxxxxxxx>]

> Is there some data on pattern matching in Gnu Go?
> (how many patterns used, pattern shapes, speed of matching as a function of 
> number/size of patterns, how they are harvested, how much they contribute to 
> the playing strength and how they contribute to playing strength?)

How many patterns used:

$ grep "^Pattern" patterns/*.db|wc -l

  10854

Pattern shapes:

http://www.gnu.org/software/gnugo/gnugo_10.html#SEC109
http://www.gnu.org/software/gnugo/tuning.html

How they are harvested: they are written by hand,
tested against the testsuite, and argued about
in the mailing list.

How much they contribute to the playing strength is
an almost meaningless question. If the pattern
databases were removed, GNU Go would frequently
pass and would know nothing about life and death
of dragons. It is not much of an exaggeration to say
that the pattern database is the essence of the
program.

Daniel Bump

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