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Re: [Bug-gnubg] never too good?
From: |
Joern Thyssen |
Subject: |
Re: [Bug-gnubg] never too good? |
Date: |
Fri, 2 Aug 2002 07:20:51 +0000 |
User-agent: |
Mutt/1.2.5.1i |
On Fri, Aug 02, 2002 at 07:07:00PM +1200, Joseph Heled wrote
> Øystein O Johansen wrote:
> >
> > > Your opponent has borne out at least one
> > > one. It is possible the positions is no-double,
> > > double/take and double/drop.
> > > But can it ever be too-good-to-double/drop?
> >
> > Yes, I think you're right. These are the only
> > three cube decisions that makes sense. Valid for
> > money game and match play. I can't think of any
> > known paradoxes that invalidates the statment
> > either.
Assuming that both players play perfect....
> This is the position that prompted my temporary self doubt. (number 55 in
> doubles.dat 0000)
>
> GNU Backgammon Position ID: BgAC2HZ7AAAEAA
> Match ID : MAGgAAAAAAAA
> +12-11-10--9--8--7-------6--5--4--3--2--1-+ O: gnubg
> | X | | O O O O O | O 0 points
> | | | O O O O O | On roll
> | | | O O |
> | | | O |
> | | | |
> ^| |BAR| | 5 point match (Cube: 1)
> | | | | XX
> | | | | XX
> | | | | XX
> | | X | X | XX
> | | X | X O | XX 0 points
> +13-14-15-16-17-18------19-20-21-22-23-24-+ X: joseph
>
> My cubefull rollout gave
> ND 59.428%
> D/T 59.754%
>
> With D/D 57.5%, this is strange. Without gammons/bg's, ND should be <=
> D/D. I think this means X is making a great number of bad takes, or
> in other words, this position (and others like it) are a good source
> for finding positions where GNUbg makes cube errors.
I agree.
When I get home, I'll try doing a rollout with gnubg and see if I can
reproduce the result, so eliminate possible bugs.
What were your rollout settings?
Jørn
--
Joern Thyssen, PhD
Vendsysselgade 3, 3., DK-9000 Aalborg, Denmark
+45 9813 2791 (private) / +45 2077 2689 (mobile) / +45 9633 7036 (work)