[Bug-gnubg] Re: ratings formula, checker play vs. cube

[Robert-Jan Veldhuizen]

At 12:01 9/13/2003 -0400, you wrote:
> I  think you  are  still missing  the  point that  the contributions  of
> checker play  errors and  cube play errors  are converted  to equivalent
> rating  loss  INDEPENDENTLY.

No, you miss my point. The above is obvious. Let me repeat. The problem is, 
cube errors are input into your formula AFTER being divided by what GNUBG 
considers "actual or close decisions". As I explained, that is often no 
good for match play and as such this gives inaccurate ratings. Read my 
other posts to see why.

Dividing the total cube error by all cube decisions gives a better estimate 
of someone's cube skill. Try it if you don't believe me, I'd say. I've 
analysed about 400 matches and I'd say GNUBG's current method is worse than 
the old method of counting all cube decisions.

Also see my examples about closed-out situations and 2-away both to see why 
the current method is inaccurate for match play.


--
Robert-Jan Veldhuizen