[Bug-gnubg] Re: No more need to panic about backgame play anymore

[Joseph Heled]

Neil Kaz wrote:
> Joseph wrote :
>
>
> > 2 ply
> >
> > filters are default.
> >
> > set evaluation movefilter 2  0  2 3 0.1
> > set evaluation movefilter 2  1  0 0 0
>
> Neil replies: I didn't know how to change the evaluation move filters. So I
> just ran it 2-ply default with the new version 13.  As I type this (800
> games), GNU is winning from the backgame side almost as much as Snowie 4 3
> ply did. And the cubeless equity for the backgame is -.576 (note SW4
> was -.554) This is about what I'd expect
> since I do feel SW4 plays it just a little bit better, noting that this
> really isn't enough games to be statistically certain.

Perhaps, but this is the figure I got for the 0 ply. I feel the 2ply 
should do better. My (very small) 96 games indicated a -0.50 figure, but 
it might have been lucky. Will try to generate a larger sample later.

Neil, what does your GNU 0ply rollout says. It should take only a few 
minutes for a 12960 sample?

-Joseph

> Also note that default settings don't have filters as large as SW 4. Mike
> Depreli told me the SW 4 filters and I'll match them exactly and run 50%
> speed tomorrow. (Should match SW 4 3-ply precise)
>
> Now that I know that GNU can now handle backgames, I'll take a look at
> several holding game reference positions I have where SW 4 is clearly
> overvaluing the defender's chances. SW 4 can be more than .100 cubeless in
> error in some holding games positions where the defender has a blot behind
> the advanced anchor. Let's hope GNU isn't making the same mistakes.
>
> Please forward this to the rest of the GNU team and thx for your help.
>
> ..neilkaz..