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BGonline.org Forums
GnuBG Full rollout bugged?
Posted By: Carlo Melzi
Date: Monday, 18 May 2009, at 9:01 a.m.
I ran into this position last week in a local club superjackpot. I was playing Blue and, behind 1-7 to 11, I doubled and White passed.
The score (after 0 games) is: Blue 7, White 1 (match to 11 points)
Move number 2: White on roll, cube decision?
Blue 94
White 149 Position ID: cP8BAJBtGwCwBQ Match ID: cAlgAXAACAAA
There was some discussion afterwards, with some people agreeing with the pass and some other pointing out a clear take.
I tried some 1296 full 2-ply rollouts with GnuBG and all of them result in something like this:
Rollout 2-ply Double, Pass +1,000 Double, Take +1,138 No Double +1,117 Correct Cube action: Double, Pass
I don't have the rollout details here, but does this make sense to you?
After the rollout, GnuBG says Double/Pass, but according to the cubeful equities, the correct decision seems to be... TGTD/Pass!?!?
The equity for Not doubling cannot be greater than 1, since Blue cannot win gammon here!
Does anybody feel like trying a full rollout of the position with GnuBG and verify whether GnuBG has a bug in full rollouts?
Thanks, Carlo
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