[computer-go] ELO Ratings of move pattern

[Álvaro Begué]

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.

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).

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

Álvaro.



>
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