Re: [Bug-gnubg] never too good?

[Joseph Heled]

Joern Thyssen wrote:
> 
> On Fri, Aug 02, 2002 at 07:20:51AM +0000, Joern Thyssen wrote
> > On Fri, Aug 02, 2002 at 07:07:00PM +1200, Joseph Heled wrote
> > >  GNU Backgammon  Position ID: BgAC2HZ7AAAEAA
> > >                  Match ID   : MAGgAAAAAAAA
> [snip]
> > > 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.
> 
> With a 1296 games 0-ply rollout (no truncation, with var.redn.) I get:
> 
> ND  59.96%
> DT  60.09%
> DP  57.76%
> 
> --> too good to double, pass.

which we agreed can't be the right one. My code, BTW, has been checking this for
a long time now -

(line 724 in analyze/danalyze.cc)

    if( probs[1] == 0.0 || /* no gammons */
        matchProbDoubleDrop > matchProbNoDouble ) {
      actionDouble = true;
    } else {
      actionDouble = false;
      tooGood = true;
    }

> 
> Jørn
> 
> --
> Joern Thyssen, PhD
> Vendsysselgade 3, 3., DK-9000 Aalborg, Denmark
> +45 9813 2791 (private) / +45 2077 2689 (mobile) / +45 9633 7036 (work)
> 
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