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Re: [Bug-gnubg] Re: Race database and bearoff DB

From: Øystein O Johansen
Subject: Re: [Bug-gnubg] Re: Race database and bearoff DB
Date: Tue, 1 Oct 2002 14:30:41 +0200

> I have ported Joseph's OSR code to a local copy of gnubg,
> but I never got around testing it.

Which bearoff database do you use for this? The problem with
the porting is that bearoff databases. I ported this as well
but I had to use the bearoff database from Joseph, and then
where was suddenly two bearoff databases for one program.

(BTW: Should we maybe find a better encoding for the gnubg
bearoff database? We don't want to store all these zeros.)

> It's fairly simple to extend the current one sided bear-off
> database up to at least 10 points. It takes around 6 hours
> to generate on my 1GHz box: 3268760 positions ( x 32 values
> x 2 bytes/value = 209MB).

I'm getting a new computer in a couple of days (2.2 GHz), I
think I can generate the table if you tell me how to hack

> I'll also look into extending the exact bear-off database and
> have it included cubeful money game values.

That would be an improvment I believe!

> Maybe it's possible to make another OS bear-off DB that goes
> even further if we restrict it to, say, 10 chequers per point.

Will it be any interest of that?

> These one-sided bear-off databases can very easily be combined
> with the OSR code giving fast and reliable evaluations.

Rolling out until we reach the db, yes if the db is large each
trial will consume lesser time.

> Joseph also has an algorithm for converting OSR evaluations
> to cubeful equities.

I've heard of this, but I don't know/understand how it works.
Joseph? Is this code in fibs2html?

> I'll see if I can get it to work.


> Unfortunately people would have to generate their own
> databases since I don't think we have the necesary
> band-width/web-space for such files.
> Alternatively, we could sell them on CDs from gnubg.org :-)

Yes, I think we might be able to sell some. We won't be rich
but this is an idea.


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