[Bug-gnubg] checking cubeful or not makes a difference when it shouldn't

[bob koca]

  I rolled out a one point match using player 0 as advanced and player 1 as expert.
I had the advanced player on turn and used the rollout as initial position option. 
In one rollout I checked cubeful under general settings and the other one I didn't. I 
was expecting the rollouts to be exactly the same since there are no cube considerations to be made in a one point match. However they were not. Even more perplexing is that the difference was definitely statistically significant.
With the cubeful box checked off the advanced player had .472404 wins with std error of .001281.
With the cubeful box checked on the advanced player won .458272 with SE of .001268
 
  Other settings that I had checked were 
i) to truncate cubeless at exact bearoff database
ii) variance reduction
iii) use quasi random dice
iv) rollout as initial position
v) cube decisions use same settings as checker play
 
  Is it a bug that the results are not the same? What should I use to see correctly 
how often advanced would beat expert in one point match?
 
thanks for assistance, Bob Koca

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