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GNU error rating vs. XG PR

Posted By: Timothy Chow
Date: Tuesday, 29 December 2009, at 4:11 p.m.

In Response To: GNU error rating vs. XG PR (eXtreme Gammon)

I'll update the help file with these numbers.

Thank you! But let me clarify a couple of my questions.

1. The threshold I was asking about was for an optional double. For a double to be optional, is it enough for the equities with and without doubling to differ by, say, 0.001? Or do the equities have to be literally, mathematically equal to count as an optional double?

2. What I was confused about regarding the negative equities was that sometimes in a match your equity can be negative but it can still be correct to double. Re-reading your help, I see now that you intend to cover this case with the clause that "a double decision resulting in a double" is never considered obvious. The first time I read that, I thought you meant that if the player actually doubles then you always count that as a decision, even if it's an obviously wrong decision. What you meant, I believe, is that if it's technically correct to double then you always count that as a (non-obvious) decision. I assume, however, that you actually mean both. If so, then maybe you can add a line to the help saying that if a player actually doubles then it is counted as a decision, even if the decision would otherwise not be counted because it was "obviously not a double."

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