[Bug-gnubg] Ratings

[Albert Silver]

Hi all and merry Christmas,

I received the following question regarding the tutorial, and included my reply.

> 1. Comparing some information with the "GNU Backgammon Handbook" on
> http://www.gnubg.org/win32/gnubg/gnubg.html#Analysing I found a
> difference between the definition of error rates in those two sources.
>
> You state:
> 0.0000 - 0.0017 Supernatural
> 0.0017 - 0.0062 World Class
> 0.0062 - 0.0083 Expert
> 0.0083 - 0.012 Advanced
> 0.012 - 0.018 Intermediate
> 0.018 - 0.026 Casual Player
> 0.026 - 0.035 Beginner
> 0.035 - infinity Awful!
>
> The GNU Backgammon handbook says:
> 0.000 - 0.002  Supernatural
> 0.002 - 0.005  World Class
> 0.005 - 0.008  Expert
> 0.008 - 0.012  Advanced
> 0.012 - 0.018  Intermediate
> 0.018 - 0.026  Casual Player
> 0.026 - 0.035  Beginner
>  > 0.035  Awful!
>
> So there is a  difference for the first four categories. Can you tell
> me, which of both is correct?

Actually, the 1st category is merely rounded off from 0.0017 to 0.002,
however there is indeed a difference for the limit of World Class for
example. The numbers quoted were given to me directly in the mailing
list when I asked about them for the tutorial. As far as I know, 0.006
is Expert (memory of analyzing matches says this too) so I think the
tutorial's numbers are correct. I'll send this to the mailing list to
get a final position.

Regards,

Albert