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Score differential = (adjusted gross score − course rating) × 113 / slope rating. Handicap index uses the best 8 of your last 20 differentials, averaged, then multiplied by 0.96. Course handicap = handicap index × slope / 113 + (course rating − par). The WHS replaced multiple regional systems in 2020 for global portability. Handicaps are administered through authorized golf associations.
Course handicap ≈ 18.0