Re: [computer-go] Mass estimation of game results?

[Arend Bayer <arend.bayer@xxxxxx>]

On Sun, 21 Aug 2005, Adrian Petrescu wrote:

> A friend and I are in the process of compiling a fairly large database of
> amateur games from Go Servers, like IGS, KGS, etc. We recently came into a
> collection of about 30,000 IGS games but they have a slight problem -- they
> are all missing an RE[] tag, so they are heavily decreased in value for a
> database. What I was thinking of doing is writing a small script to run all of
> their final positions through GnuGo's score estimator, and trust it. Some of
> them will be wrong, I know, but most of them will be correct, so it is a
> sacrifice I am willing to make. The only difficulty I can foresee is knowing
> how the game ended -- GnuGo will give me an estimate, but it cannot know if
> White or Black resigned at some point, for example. My question, really, is if
> anyone knows of a program or script that will tell whether a game is completed
> -- that is to say, it is at a stage where only dame points are left, all
> territory is decided, etc. This way, I can run a game through both GnuGo and
> that program, and if the game is not finished, I will take GnuGo's estimation
> as a +Resign, and if it is, I will trust GnuGo's score estimate.

You could ask GNU Go to generate a move, and then find out (e.g. via
top_moves) about it's value. If the move was pass, or it's value less
than 0.5 or so, the game should have ended.

GNU Go' estimate will give the correct result for finished games with a
pretty good probability. For unfinished games, it will very often be wrong.

Arend

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