SECTION 13 — ODDLY SHAPED GREENS 9. ODDLY SHAPED GREENS
Effective diameters of “oddly shaped” greens may not be equal to the average of the width and depth. In some cases one dimension is weighted more than the other. In other cases, the “circle concept” is applied. A green where a single measurement for one or more dimensions is not consistent, using an average (or weighted average) would be appropriate as in example A. A long, narrow green is evaluated as in examples B and C. If using the circle concept, do not reduce the effective green diameter of any circles used in the calculation, even if they meet the >2:1 or >3:1 concept (see examples B and C) since the overall effective green diameter will be reduced by the circle concept itself (see example D). The “circle concept” involves overlaying circles (or ovals) of various sizes on unusually-shaped greens, then determining a weighted average of the circles’ (or ovals’) diameters to get an effective green diameter (EGD). The circle concept should be used when a player cannot putt from one part of the green to another (see example D). Consideration must be given to commonly used hole locations and the assumption that hole locations are at least four yards from the edge of the green. When in doubt, do not use the “circle concept.”
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