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

From: Ian Shaw
Subject: RE: [Bug-gnubg] Rollout data not displayed in no-gui version
Date: 10 Oct 2003 10:33:39 -0000

> 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.

-- Ian




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