RE: [Bug-gnubg] Re: Strange FIBS ratings

[kvandoel]

On Wed, 10 Sep 2003 03:15:39 +0200, Robert-Jan Veldhuizen wrote:

As to GNUBG's ratings, I think the main problem is (still) the fact that
the  total cube  error is  divided  by the  number of  "actual or  close
decions",  while  checker  play  errors  get  divided  by  all  unforced
moves.

This causes the cube error rate per decision to be a lot higher than the
checker play error  per decision, which in itself  causes cube errors to
be overvalued.

No  it doesn't, as  the cube  error is  multiplied by  an experimentally
determined factor which takes this into account.

So R = a*player_err + b* cube_err.

The effect you are worrying about is taken care of by the factor b which
is much smaller than a.

Kees