Re: [Bug-gnubg] Bearoff DB bug?

[Joern Thyssen]

On Mon, Dec 09, 2002 at 07:07:52AM -0500, Hanley Hayes wrote
> In the attached match, game 1, in move 22 with me having the following
> position:
> 
> 1 checker on my 1 pt
> 3 checkers on my 2 pt
> 1 chcker on my 5 pt
> 
> I rolled 43.
> 
> I, of course, moved 5/1 2/off, leaving me with 2  checkers on my 1 pt and 2
> checkers on my 2 pt
> 
> In analysis, GNU reported this move as 'doubtful', instead preferring 5/off,
> which is terrible.  It leaves 1 checker on my 1 pt and 3 checkers on my 2
> pt, which in the event of two consecutive rolls of 21 would not get them all
> off (as would be guaranteed by my move).
> 
> I am running the Windows Dec 2 executable, with the 5MB bearoff database
> downloaded.

gnubg is using the one-sided database for this position (gnubg_os0.bd). 

It could be one of those positions where the one-sided bearoff database
is wrong. I'l check with my larger two sided one when I get a chance to
boot into linux.

Jørn