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Extremegammon Question on deeper Analysis

Posted By: Neil Robins
Date: Thursday, 10 September 2009, at 3:43 a.m.

In Response To: Extremegammon Question on deeper Analysis (Christian Plenz)

eXtreme Gammon, by default, compares your play to the 3-ply analyze (normal search interval). In this case it flags the take action as an outplay (for 0.052 equity) It means in the analyze panel it always show the bot decision with a 0 equity difference (the number in parenthesis)

You can change that default behavior from the option/analysis and unchecking "Error compare to XG"

The export, as it does not show the move played, implicitly uses this setting.

This strikes me as an evasion of the fudamental point. If the rollout says:

Cubeful Equities:

No Double: +0,894 (-0,106)

Double/Take: +1,052 (+0,052)

Double/Drop: +1,000

Best Cube action: Double / Drop

The error from not doubling is 0.106. If the bot on 3-ply were to make the same error as the player by not doubling then I can see that there should be no error compared to XG. But if the bot thought D/T, and no double was given, there is no issue of an outplay for the take action because there is no take action (and if there was it wouldn't be relevant to the player making the double decision's error rate). Therefore, as I see it, for the analysis panel to say the error of No Double here is 0.158 (i.e. 0.106 plus 0.52) is fundamentally absurd and unquestionably a bug that needs wiping out of XG.

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