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Will the real takepoint please stand up?

Posted By: Rick Janowski
Date: Monday, 6 October 2014, at 9:04 p.m.

In Response To: Will the real takepoint please stand up? (bill calton)

Cube efficiency as used by XG is applied for the purposes of interpolating between dead and live equities, not for interpolating between doubling points. If the former is a linear calculation, strictly speaking, the latter can not be, and vice versa. But lets say we use a take point interpolation factor z = 0.7, the cube efficiency, x = 0.65 approximately.

If z = 0.7 for a particular position in a money game, it will not necessarily be the same value for the same position at a different match score, because the size of the take-window between dead and live may be different. A wider window will generally lead to higher x and z values.

As an example, I used XG to determine a take point in a short race where the z value was 0.57 for money, but at 4a4a where the take window is 9.5% compared to 5% for money, the z value is 0.68. Consequently, if the z value is 0.7 for money it will rise to about 0.78 for 4a4a. This means the take-point is about 21% rather than 22%. Small difference here, but could be significant when computing a redouble take point at skewed scores.

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