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Prime v. prime --roll out

Posted By: Daniel Murphy
Date: Saturday, 22 May 2010, at 4:13 p.m.

In Response To: Prime v. prime --roll out (joe freedman)

It would be somewhat interesting, Joe, to roll out every position where you ended "truncated" your games and compare the evaluations to the rollouts, to see how accurate the evaluations were.

I played Gnubg to the end 24 times and won 19 of them. Seems about right.

About the "automatic" redouble to four: I believe Gnubg does not redouble "optional redoubles" -- position for which it judges ND equity and D/T equity to be equal. XG apparently works the same way, but someone could confirm that by looking at a position in which XG does not redouble and see that ND=D/T. The bot is not trying to trick you into a bad take later. It's not that smart. It simply does not see any market losing sequences. Gnubg does not immediately redouble to 4 after you have advanced to the 23 point (1-1 3-1 4-1 5-1), advanced to the 3 point (2-1 3-2 3-3), or escaped (6-1 4-3 5-3 6-3).

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