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Backgammon and variants.

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20. august 2011, 16:16:10
toedder 
You counted 65 twice ;)

I don't think it's a user error. I don't know how I would make an error there. Also, the only thing I changed for it to come to the same conclusion as myself was setting the analysis level to grandmaster instead of expert.

20. august 2011, 18:00:22
wetware 
Teema: Re:
wetware toimetatud (21. august 2011, 01:00:57)
toedder:  discussion of a similar position can be found on pp. 66-68 of Improve Your Backgammon by Lamford and Gasquoine.

However, their initial example is at a much different match score: with the cube already "yours" at 2, and with you leading in the match by a score of 3 away / 5 away.  Given that situation, the correct cube action is: No Double / Take.  (By their methods, you would need to be a 62.5% favorite to bear off in that situation for the redouble to be correct.)

They do also discuss a general approach to the cube decision, given any particular match score.  (So, I'd love to know the exact match score in your case--just how early in the match was it?)

Also mentioned in the book is the correct cube action if the position were played as a money game:  double/redouble/take

21. august 2011, 12:46:31
toedder 
Teema: Re:
wetware: I am on my phone atm, so I cannot easily look it up. But I am fairly certain that I was 17-away and my opponent 16-away. And as mentioned, GnuBG told me the same when I set this up as a money game. So to me it seems as if the expert level simply has some big flaws when it comes to end game situations.

21. august 2011, 13:47:54
playBunny 
Teema: Re: GnooBg coob boob
toedder: I can't reproduce the error on any of the versions that I have (Oct 2005, Nov 2009 and July 2011). Which version of GnuBg are you using and what MET is speciied?

20. august 2011, 19:51:40
grenv 
Teema: Re:
toedder: i did do something stupid. Anyway, must be a bug in the program then, since the calculation involves probabilities 1 and 0 only.

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