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the double action is ?

Posted By: Rick Janowski
Date: Sunday, 6 May 2012, at 8:23 p.m.

In Response To: the double action is ? (Stick)

Doug Zare has written a couple of excellent articles/papers covering this issue:

http://www.bkgm.com/articles/Zare/GammonPrice/index.html

http://www.bgonline.org/forums/webbbs_config.pl?noframes;read=121137

I quote from Doug’s original article (the first link):

“That the gammon price for money is not 0.5 is contained in Janowski’s formula, and also implemented in Jellyfish. That the gammon price is less than 0.5 is why one can take (correctly) blitzing cubes in which the cubeless equity is below -0.6, even though -0.55 is a reasonable threshold for races, and it is almost never correct to take in a race where the cubeless equity is below -0.6.

More complicated adjustments can be made to the gammon prices at match scores and cube values where the cube is not dead. Snowie makes some adjustments, but I believe Jellyfish does not, and that this is one of the reasons Snowie is better at match play than Jellyfish. On the other hand, when one performs a cubeless rollout with Snowie, I’m not sure whether it uses a gammon price of 0.43 or 0.5, and neither of these might be appropriate for a position from a match.”

“SUMMARY

The gammon price is a useful idea. I recommend learning not just the take points at important match scores, but also the gammon price. This can help in both cube and checker play decisions. However, the gammon price needs to be adjusted to take into account the possibility of future doubles. The gammon price for money when you are not too good to double is about 0.43. That cubeless equity is based on a gammon price of 0.5 means that it is inaccurate for comparing plays which lead to different numbers of gammons, even for money play.”

Although Doug cites part of my work on doubling cube theory as a basis for explaining how cube ownership/efficiency tend to reduce gammon prices to values between 0.4 and 0.5, I must admit that when I derived the formula and methodology in “Take-points in Money Games” I was unaware of the effect on gammon price. This insight was Doug’s alone.

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