[computer-go] ELO Ratings of move pattern

[Jason House]

On Dec 6, 2007 10:13 AM, Álvaro Begué <alvaro.begue at gmail.com> wrote:

>
>
> On Dec 6, 2007 10:06 AM, Jason House <jason.james.house at gmail.com> wrote:
>
> >
> >
> > On Dec 6, 2007 7:13 AM, Álvaro Begué <alvaro.begue at gmail.com> wrote:
> >
> > > 88|0|17.033168
> > > 88|1|12.263955
> > >
> > > and
> > >
> > > 164|0|17.388714
> > > 164|1|25.862695
> > >
> > > Are identical except for swapping the roles of white and black
> >
> >
> > Curiously, the gamma values in your example are way different
> >
> > 17.033168 vs 25.862595
> > and
> > 12.263955 vs 17.388714
> >
>
> That was exactly my point. Those should theoretically be identical, which
> means that the difference comes purely from noise. The games that were used
> for training probably don't have enough examples of these patterns to get a
> good estimate of their true strength.
>

This may serve as a good test of if there is enough data to assign values to
the patterns.



Actually, the gamma values are only determined up to a multiplication of all
> of them by a constant. Because patterns with white to move and patterns with
> black to move never compete with each other, they may have drifted in such a
> way that the discrepancy is not as large as it seems (since both ratios
> 25.862595/17.033168 and 17.388714/12.263955 are similar).
>

That may be a fluke.  Other pairs have a much different ratio
0|0|1.463386
0|1|1.337276



> Still, forcing those gamma values to be identical seems like the right
> thing to do.
>

I agree
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