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Because of the 68.4-72 part. If he shoots 10 over par (his course handicap), he will have shot his index. You don't factor par in when you calculate the differential, but you do when you calculate the course handicap. That's where the difference comes in. It works symmetrically: guy shoots 82 and gets a 12.4. Guy plays off a 12.4 and… has to shoot 82. -
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By xrayvizhen · Posted
I'm the commissioner of a golf league and am often asked about why someone's handicap is this or that or why it's going down or why it's not going up. Those kinds of questions can easily explain but this one has me struggling to come up with a logical answer. I understand the formulas to calculate the course differential for individual rounds, the handicap index that results after averaging the best 8 differentials of the most recent 20 rounds and finding the course handicap for an individual round. What I don’t understand is the logic. Here’s an example: Suppose a golfer plays the same course all the time. Let’s say it’s a Par-4, the Course Index is 68.4 and the Slope is 124. If someone shoots an 82, assuming no adjustment, the differential for that round would be (82-68.4) X (113/124) =12.4. Let’s further assume the average differential of his best 8 rounds is also 12.4. Now, if he goes back to that same golf course, his Course Handicap will be 12.4 X (124/113)+(68.4-72) = 10. I understand the math...that's pretty simple. I don’t understand the logic. Why aren’t they the same?
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