RE: [Bug-gnubg] change in calculation of cube decision ratings

[Ian Shaw]

> 
> Hi,
> 
> I've tried to implement a "unforced cube decisions" to be used for the
> ratings analogous to the unforced moves for chequer play. Hopefully,
> this should give more realistic cube decision and overall ratings.
> [snip]
> A close cube decision is defined as decisions where
> 
> abs(no double - double take) < 0.1
> 
> or
> 
> abs(no double - double pass) < 0.1.
> 
> Typically, this means that you're well into the market window.
> 
> Any comments regarding the threshold?
> 
I long for the day when I don't make any cube errors > 0.1! Douglas Zare
claims to still make 0.4 errors (not necessarily on cubes), so maybe that
should be the limit.

What will happen if no decisions were within the threshold and yet I make an
error?

> An alternative solution would be to calculate the initial double point
> and assume a close cube decision if your winning chances are above the
> IDP.
>
This sound like a good idea at money play and would be OK at many match
scores. However, there are some scores where the window is very narrow or
even non-existent, such as some 2-away scores where you can bo
Too-good-and-not-good-enough if you have gammon chances.
 
Ian