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The yardage at which you stop hitting half your greens — the honest outer edge of your scoring range, and the number to move.
Green edge is a fixed line on the ground — score where each ball comes to rest against it, not where it first lands. A shot that pitches on and runs through scores 0; one that lands short and releases on scores 5. Mid-iron to wedge · 15 balls · A real green or a marked target of green size · Rangefinder or measured yardages · | No specialist technology is required, but a launch monitor helps set the three yardages — see Set up.
Use the same three yardages, the same target and the same ball every time you retest — the crossing point only means anything against a matched set-up.
The benchmark is the half-greens figure for each handicap in the reference data. It is a population average measured in yards, so it carries that sample's driver distance with it — scale it against your own driver before treating it as your target, and judge your gap over several sessions rather than one.