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Bomberman is correct on the best 10 out of the last 20. However, he left out another factor and that is the Golf Course's slope and rating.
Here's the "official" calculation method:
How to Determine Handicap Differentials
A handicap differential is computed from four elements: adjusted gross score, USGA Course Rating, USGA Slope Rating and 113 (the Slope Rating of a course of standard difficulty).
Handicap Differential = (Adjusted Gross Score - USGA Course Rating) x 113 /USGA Slope Rating
I can't find a solid definition for adjust gross score. I believe it's what you shoot for the round. Slope and Rating can be found on the score cards.
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