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[Bug-gnubg] Re: Checkerplay vs cube decision errors

From: Joachim Matussek
Subject: [Bug-gnubg] Re: Checkerplay vs cube decision errors
Date: Fri, 21 May 2004 07:03:00 +0200

address@hidden schrieb am 20.05.04 19:09:06:
> On Wed, 19 May 2004, Joachim Matussek wrote:
> > > I don't understand the ssecond paragraph of the "Results". If the cutoff
> > > for  actual cube  decision is  decreased  to .05  the #  of actual  cube
> > > decision goes  down and the coefficient  b(N) will also go  down (it was
> > > measured assuming a fixed cutoff) so nothing changes.
> > Should be  self-explaing now. It  is not b(N)  which goes down.  It is
> > b(N)/(No. of close or actual cube decisions) which goes down.
> I don't get  it. If you reduce  the cutoff "No. of close  or actual cube
> decisions" goes down. b(N) also goes down so the ratio remains the same.
> Kees

Hello Kees,

you seem to be right.

It seems that (a2(N)/(No. of unforced moves))/(b(N)/(No. of close or actual 
cube decisions)) only depends on the match length. It ranges from 3.38 to 2.56 
within the chosen examples.

Thus we should be able to conclude that checkerplay errors and cube decision 
errors have different weights when calculating a player´s rating. It also means 
that they have different influence on the outcome of matches.

If yes, why?

Isn´t our term and calculation of cube decision errors flawed? Should we 
estimate cube errors in a different way?

Any comments appreciated,

Joachim Matussek

P.S.: Is anyone annoyed to find this discussion in address@hidden We should 
switch to rec.games.backgammon then. I prefer this location at this moment.  
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