Re: [Bug-gnubg] Rollout data not displayed in no-gui version

[Joern Thyssen]

On Fri, Oct 10, 2003 at 10:33:39AM -0000, Ian Shaw wrote
> > Jim Segrave wrote:
> > 
> > You are now about to roll out the choice of doubling or not, from the
> > starting position, with the first roll not being a double. Do the
> > rollout. The results of the no-double rollout are what you
> > wanted. They can be saved, printed, extended, what have you. It's just
> > a shame that you also get a rollout of the illegal double, which is
> > simply wasted CPU cycles.
> > 
> 
> Thanks, Jim. I'd worked out a similar sequence to get back to the
> initial position. The only problem left is, as you say, the CPU time. In
> tests, Analyse...Rollout got through 165 trials in 1 minute, but rolling
> out the decision only managed 52 trials. I'd expected it to be no more
> than twice as slow, but it seems like the factor is over 3. Most moves
> will be the same irrespective of cube position, so I'd have expected
> caching to reduce the impact of rolling out both cube locations.
> 
> I'm looking to do over 60000 trials at 2-ply, so upping it from 6 weeks
> to 18 is a big deal, nay, heartbreaking.
> 
> Is there any way of rolling out take only, or double only? (I'm rolling
> out post-Crawford 2-away, so I'm interested in the cube being on 2 at
> the moment.) I can see this being a generally useful option. Many times
> we are sure of the double, and are only interested in the take decision.
> Other times, we will be sure it's a take, but wonder about the double.

"rollout" instead of "rollout =cube" will rollout the current position
as "on roll", so if you want to rollout the take decision just give the
opponent the cube and select "rollout".

AFAIK, this is a function that Snowie doesn't have: snowie can only
rollout decisions, either cube or chequer play.

Jørn

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