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Re: [Bug-gnubg] Ideas and suggestions ollected at Nordic Open

From: Øystein O Johansen
Subject: Re: [Bug-gnubg] Ideas and suggestions ollected at Nordic Open
Date: Wed, 30 Mar 2005 13:54:33 +0200

Let me take the second one first:

> 2. In some windows resolution the size of the manual dice
> window is ugly and too big. Make it resizable?

The function GTKGetManualDice() calls a function GetSetSize(). This
function returns a value the width of the screen divided by 170. It fucks
up on widescreen resolutions. I'll look at this.

> 1. It would be nice to use number keys (keyboard) to set up dice
> while recording a match.

I have not tried yet, but can this be as simple as adding a cb signal in
the GTKGetManualDice function?

gtk_signal_connect(pwDice, "key-event-press", SIGNAL_FUNC(NumberPressed),

will that work?

> 3. In the summary of analysed matches players would like to see a
> line: match winning chances (similar to Snowie)

It's (at least) two ways to calculate that number.

- According to the Luck adjusted result.
- According to the estimated Fibs rating.

(The numbers will *not* be the same.)

The fibs rating difference is simple: Take the difference of the estimated
fibs rating and but it into the fibs rating formula. The match winning
probability for the underdog is:

1 / ( 10 ^ (D * sqrt(n)/ 2000) + 1 )

Where n is the match length.

The match winning chance accoring to the luck adjusted result is: 50% +
LAR. That's about what's
reported, isn't it?

> 4. IIRC the luck adjusted fibs rating is based on 0ply?! Some
> asked for the possibility to base it on the analyse settings

(The fibs rating is not luck adjusted... It's a estimated fibs
rating (based on the errors) and a luck adjusted result. (Based on the
The luck adusted result is simply the result of the match minus the total

All luck calculations in GNU Backgammon is 0-ply. We can make that 1-ply or
2-ply of course, but I'm not sure it's smart. I can elaborate.

> 5. Better documentation (I will try to find some time to work on it
> again)

Yes.... I also see a lot of things that changing. It's a bit hard to
document a program that changes as much as GNU Backgammon does.

> Oystein and I got a lot of positive responses, a few top rated
> Danish players do already use gnubg for professional analyses of
> their matches or would like to use it in future (depending on the
> usability).

Yes, I see GNU Backgammon being used more and more, but someone still ask
what it is. Maybe some day will come when someone starts up a snowie and
players ask what that is. ;-)


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