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Portes scoring

Posted By: Chuck Bower
Date: Thursday, 1 September 2011, at 7:20 p.m.

In Response To: Leon, a new very strong backgammon program!? (GeorgeMJ23)

According to Tom Keith's encyclopedic backgammon site:

http://www.bkgm.com/variants/Portes.html

gammons are scored in Portes, (but not backgammons, as you say). So an equity difference of 0.04 should include some gammons.

If this version doesn't score gammons extra, then I think the author should have simply reported the results in wins&losses, not equity units.

BTW, I think you need to use the multinomial distribution (not the binomial) to calculate the uncertainty if gammons are scored differently than simple wins. I could do that, but I bet UBK (and others here) can do it faster than I. One could assume 13% gammon wins for each side and thus 37% simple wins for each side, which has been M/L the breakdown since JF became available (and probably even for TD-Gammon).

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