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Too good to double when a gammon is impossible?!

Posted By: Timothy Chow
Date: Saturday, 22 August 2009, at 2:45 a.m.

In Response To: Too good to double when a gammon is impossible?! (Bob Koca)

Bob Koca wrote:

The RO does not tell you what the theoretical equity is. It tells you what would be the equity of gnu playing vs. gnu so I don't see it as a bug.

But gnubg will go further and say "Alert: wrong double." The clear implication here is that gnubg is telling you that the double is theoretically wrong. But if gnubg claims that it would be correct for the opponent to drop the double, then it should not also claim that it is wrong to double (when gammons are impossible).

Users expect (rightly, in my opinion) that the chart of results produced by gnubg is telling them, "This is my best estimate of the theoretical equity, after doing a rollout," and not "This is the equity of playing the position against myself." Thus if the rollout produces estimates greater than +1.000 for both cube positions, then the program ought to truncate the "no double" estimate down to +1.000 when gammons are impossible.

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