What is ESR (Exceptional Score Reduction)?

Rules of Handicapping, Rule 5.9

View rule 5.9 - Here

What you should know - In 150 words or less:
If the Score Differential is between 7.0 and 9.9 strokes better, a -1 adjustment is applied to the player's most recent 20 Score Differentials in their scoring record.

If the Score Differential is 10.0 strokes or better, a -2 adjustment is applied to each of their most recent 20 Score Differentials.

Future scores made by the player will not contain the -1 or -2 adjustment (unless they are also exceptional), which allows the impact of the exceptional score reduction to slowly diminish over time.

USGA Resources on this topic:

FAQ - What is an exceptional score and what happens when I post one?
Infographic - Safeguards included under the WHS™
Poster - Exceptional Scores

What is ESR (Exceptional Score Reduction)?

Any score that produces a Score Differential™ that is at least 7.0 strokes better than your Handicap Index® at the time the round was played is considered exceptional and is subject to the exceptional score reduction.

Rules of Handicapping, Rule 5.9

USGA Resources on this topic:

Any score that produces a Score Differential™ that is at least 7.0 strokes better than your Handicap Index® at the time the round was played is considered exceptional and is subject to the exceptional score reduction.