Re: [Bug-gnubg] Difference between play and analyse

[Jim Segrave]

On Thu 28 Jul 2005 (22:25 +0200), amarganth wrote:
> Hi there
> 
> I have a problem by playing against GnuBG and by analysing the match
> afterwards: After finish playing a match I usually analyse the match. GnuBG
> ends with (for instance) a GnuBG-Error-Rate of -3.0 / Snowie-Error Rate -1.4
> / FIBS-Rating of 2012. Why doesn't GnuBG have a FIBS-Rating of (exactly)
> 2050?
> 
> My settings for Einstellungen > Analysen / Einstellungen > Beurteilungen are
> the same:
> - world class
> - noise 0.000
> - move filter normal
> - using neural net pruning
> 
> Another situation: GnuBG doubles during a game. I press the "hint" button.
> GnuBG tells me "No Double / Take".
> 
> Isn't it possible, to let GnuBG play the *best* move? Or: why aren't played
> moves and analysed moves different?

There are several different settings gnubg uses. For play, you need to
go to Settings->Players->Player0. This controls how gnubg will play
against you.

When you press Hint, gnubg does an analysis based on 
Settings->Evaluation

When you analyse a Match it uses the settings under Settings->Analysis

The reason each of these are (or can be) set differently is to allow
you to choose how quickly each function takes place. Setting 2 ply
Supremo with 2 ply cube can make gnubg take a few seconds before
making some moves, giving a hint or whatever. Some people choose to
have Hints be much quicker than a full analysis. 

If the settings are the same (and you haven't deliberately chosen to
add Noise (to make it play a bit worse), then the Analysis will agree
with the hints which will be exactly what gnubg plays. If they differ,
then for some moves, you will get different hints/play/analysis

-- 
Jim Segrave           address@hidden