Re: [Bug-gnubg] Re-evaluating moves doesn't update assessment

[Joern Thyssen]

On Wed, Jul 31, 2002 at 11:58:01AM +0200, Jim Segrave wrote
> On Wed 31 Jul 2002 (09:55 +0100), Ian Shaw wrote:
>  
> > In the annotation window, changing the evaluation settings to a higher play
> > and re-evaluating does not update GnuBg's assessment of the move i.e.
> > Doubtful, Bad, Very Bad.
> > 
> >     GNU Backgammon  Position ID: 7GwHAyDo3gYDIA
> >                     Match ID   : UYkyAQAAAAAA
> >     +24-23-22-21-20-19------18-17-16-15-14-13-+  O: StrangeLuck
> >     | X     O  O     O |   | O  O           X |  0 points
> >     |       O  O     O |   | O  O           X |  
> >     |          O       |   |    O             |  
> >     |                  |   |                  |  
> >     |                  |   |                  |  
> >     |                  |BAR|                  |v 9 point match
> >     |                  |   |                  |  
> >     |                X |   |                  |  
> >     |             X  X |   |                  |  
> >     |             X  X |   | X  X           O |  Rolled 54
> >     | O        X  X  X |   | X  X           O |  0 points
> >     +-1--2--3--4--5--6-------7--8--9-10-11-12-+  X: ian (Cube: 2)
> > 
> > 
> >     1. Cubeful 0-ply    13/4                         Eq.:  +0.404
> >        0.575 0.154 0.004 - 0.425 0.104 0.003
> >         0-ply cubeful [expert]
> >     2. Cubeful 0-ply    24/15                        Eq.:  +0.363 ( -0.042)
> >        0.589 0.094 0.002 - 0.411 0.126 0.002
> >         0-ply cubeful [expert]
> > 
> > Marked "doubtful"
> > 
> >     1. Cubeful 2-ply    13/4                         Eq.:  +0.410
> >        0.577 0.149 0.005 - 0.423 0.105 0.004
> >         2-ply cubeful 100% speed, 16 cand., 1 tol. [world class++]
> >     2. Cubeful 2-ply    24/15                        Eq.:  +0.409 ( -0.000)
> >        0.593 0.100 0.002 - 0.407 0.130 0.004
> >         2-ply cubeful 100% speed, 16 cand., 1 tol. [world class++]
> > 
> > Remained "doubtful"
> 
> I just tried this under a Unix version from last night. The window
> updates correctly (doubtful under expert evaluation, no commentary
> under world class++), the same equities being shown.

It depends on what you mean by "re-evaluate"!

If you press the "eval" button in the annotation window the assessment
will *not* be updated. However, if you modify the analysis settings, and
re-analyse the move/game/match the assessment will, in fact, be updated.
A bit confusing...

Of course, the equity losses in the match statistics will be updated.

I'm not sure what the proper behaviour is. Assume I've personally marked
a number of moves, say, very bad or very good, then I would be very sad if
these markings were lost upon re-evaluation.

Perhaps there should be an option: do or do not update markings during
re-evaluations or rollouts. Most people do not mark moves themselves,
and for those, "[X] update annotations if re-evaluated or rolled out"
would be fine.

Jørn

-- 
Joern Thyssen, PhD
Vendsysselgade 3, 3., DK-9000 Aalborg, Denmark
+45 9813 2791 (private) / +45 2077 2689 (mobile) / +45 9633 7036 (work)