Sandbagger Shield
Is that net score legit? Enter a player's handicap and round details to see the statistical probability of their performance.
How it works
Three steps · 1.0The Sandbagger Shield uses USGA handicap mathematics to evaluate the likelihood of a net score.
Enter Course Details
Input the course rating and slope rating from the tees played. These determine the expected difficulty.
Add Player Info
Enter the player's handicap index and their gross score for the round.
Get the Verdict
We calculate the expected scoring range and show you the statistical probability of their net performance.
The math behind the Shield
The math · 2.0Course Handicap
Calculated as (Handicap Index × Slope Rating) / 113, rounded to the nearest whole number. This converts a portable index into strokes for a specific course.
Expected Gross Score
A player's expected gross score is Course Rating + Course Handicap. Most rounds fall within a bell curve around this number.
Standard Deviation
USGA data shows the typical golfer's round-to-round standard deviation is approximately 3.5 strokes. We use this to build the probability distribution.
Z-Score & Probability
We calculate how many standard deviations the actual score is from expected, then convert to a probability using the normal distribution.
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