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## Re: [Bug-gnubg] Cubeful evaluation in Annotation window

 From: Joern Thyssen Subject: Re: [Bug-gnubg] Cubeful evaluation in Annotation window Date: Sat, 8 Mar 2003 12:37:15 +0000 User-agent: Mutt/1.4i

```On Sat, Mar 08, 2003 at 12:00:45PM -0000, Ian Shaw wrote
>
> >
> > On Fri, Mar 07, 2003 at 10:17:24AM -0000, Ian Shaw wrote
> >
> > This is just for your information. The cubeless equity 3-ply
> > is +0.470.
> >
> > >   0.641 0.264 0.020 - 0.359 0.081 0.002
> > > 1. No double            +0.497
> > > 2. Double, pass         +1.000  ( +0.503)
> > > 3. Double, take         +0.326  ( -0.170)
> >
> > The "No double" and "Double, take" are *always* calculated as cubeful
> > equities. In fact, gnubg can't anything else! If you toggle
> > the cubeful
> > flag for cube decisions the difference is that the best move on the
> > intermediate plies is selected cubeless not cubeful. However, gnubg
> > still calculates cubeful equities.
> >
> > For chequer play decisions the cubeful flag means that both the
> > resulting equity as well as the move selection on
> > intermediate plies are
> > cubeful (or cubeless).
> >
> > Does this make sense?
> >
> Thanks, Jørn. It's really rather obvious now. I just found it a bit
> confusing. Perhaps it would help to lay it out slightly differently.
> Perhaps add "Cubeful Equities" at the 1,2,3 bit.
> Or move the cubeless numbers below it and/or put it in brackets.
> What do you think?

Personally I think the cubeless equities are important (which is why I
originally added them to the output), because most humans think in
cubeless equities and cubeless winning percentages, e.g., if someone
says to me that a given position has a cubeful equity of +0.8, I've no
idea if this is bad or not, but if he says to me that the cubeless
equity is +0.5, I know that it's close to a pass.

I suggest:

Cube analysis
2-ply cubeless equity  -0.014
0.498 0.134 0.006 - 0.502 0.144 0.006
Cubeful equities:
1. No double            -0.020
2. Double, pass         +1.000  ( +1.020)
3. Double, take         -0.370  ( -0.350)
Proper cube action: No double, beaver (25.6%)

or with "Show evaluation parameters" from Settings->Export activated:

Cube analysis
2-ply cubeless equity  -0.014
0.498 0.134 0.006 - 0.502 0.144 0.006
Cubeful equities:
2-ply cubeful 100% speed [world class]
1. No double            -0.020
2. Double, pass         +1.000  ( +1.020)
3. Double, take         -0.370  ( -0.350)
Proper cube action: No double, beaver (25.6%)

> Or is just me who's had problems?

No, you're not the only one, that's why Øystein suggested making this an
FAQ.

Jørn

```