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Handicap (2)
The expected score on the second nine for a 9-hole round is necessary to calculate the 18-hole Score Differential for that round. The method for calculating the Score Differential is outlined in Rule 5.1 of the Rules of Handicapping. Unfortunately, neither the R&A nor the USGA publishes a formula for calculating the expected score.
Those interested in such calculations can:
- use the ready-made calculator available in the Handicap Differential tab, or
- develop the formula yourself using an existing calculator and “reverse engineering”.
The Rules of Handicapping require that, before obtaining an official WHS Handicap Index (Initial Handicap Index), the following be played and posted:
- one 18-hole or 9-hole round in EGA member countries
- three 18-hole rounds or six 9-hole rounds in other countries
Outside EGA member countries, a combination of 18-hole and 9-hole rounds is also permitted, for a total of 54 holes.
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update: August 2025