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Re: [Bug-gnubg] Rating and grading

From: Joern Thyssen
Subject: Re: [Bug-gnubg] Rating and grading
Date: Mon, 7 Jul 2003 19:06:02 +0000
User-agent: Mutt/1.4.1i

On Mon, Jul 07, 2003 at 02:40:25PM -0300, Albert Silver wrote
> Two comments regarding the rating and grading:
> - GNU's attributed rating is supposedly based on the FIBS rating system
> and is designed to give a rating that approximates what a user might get
> at FIBS. However, it's self-attributed rating seems to be what
> everything else is relative to and is at 2200. GNU does not have a 2200
> rating at FIBS, not even by a margin. I think that lowering this to
> 2050, representing it's average, would make much more sense. As a
> consequence, all its relative ratings should be lowered accordingly.

I've have some changes planned with respect to the FIBS rating.
Currently, it's a rather empirical formulae based on the normalised
error rate.

I'm planning to use the actual FIBS formula in conjunction with the new
luck adjusted result.

Still, I need to give gnubg a fixed rating, which will probably be
around 20950.

> - What exactly is a close cube decision for GNU? Cube grading seems
> overly tough overall. I have played a 6-game (250-300 ply) match in
> which it told me I had played the cube like a Beginner. Perfectly
> possible, except that it based this on a single missed cube error of
> -0.100 or so. That seemed pretty extreme to call me a beginner. Perhaps
> it shouldn't consider all moves, but I think it's filter is too harsh at
> the moment.



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