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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 21:00:26 +0000
User-agent: Mutt/1.4.1i

On Tue, Jul 08, 2003 at 08:21:36AM +1200, Joseph Heled wrote
> The FIBS rating formula is not perfect. In my small tests (using 2 
> different nets as players) the weaker player has an advantage, i.e. wins 
> more of his 3,7,9,... matches than what is implied by the 1ptr win rate. 
> So, if you stuck mainly playing against weak players, your rating drops. 
> If you play stronger ones, it goes up.
> We need lots of data - i.e. matches between GNUbg and players - analyzed 
> their error rate - and try to come up with a formula that better matches 
> the FIBS number.

One possibility is to drop the /absoulute/ fibs rating, and just print a
/relative/ fibs rating by using the FIBS rating formulae. Then we don't
need to worry about exactly what rating gnubg has. In fact, this is the
only possible solution if we use the luck adjusted result as a measure
of the players strength -- we cannot establish the absolute rating
unless one of the players has a known rating.


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