LERC Golf League Handicap Calculation System

The USGA handicap formula is found at:

    http://www.usga.org/playing/handicaps/handicaps.html

    Specifically Section 10-5. Nine-Hole Handicaps - Handicap Index (N).

We basically use this formula with the following exceptions: Since some of us won't have 10 scores prior to the League starting, we use the following table to determine how many scores to use for handicaps.
Total Number
of Scores		 Number of Scores
used for Handicap
11
22
32
43
53
64
74
85
95
106

Here's how your handicap is calculated:
Differential = (GrossScore - Course Rating) * 113 / Slope

For Desert Aire:
 Course Rating = 68.3 for 18, and 34.15 for 9 holes.
 Slope = 106

You take your best Half + 1 scores and average out their differentials.

Say so far, your scores this year were 42, 43, 46, 39, 44, and 47
There are a total of 6 scores so we will use the best half + 1 = 4.
 
Score  Differential
42 8.37
43  9.34
39 5.17
44 10.50

Average differential = 8.37.
90% of 8.37 is 7.5 - This is your 9-Hole Handicap Index

You can then use this index to come up with your actual handicap for any course you play.

Example 1.
    Let's say for example we want to figure out your 18-hole handicap for Spring Valley Lake (white tees).
    The white tee Course rating and Slope there is 69.3 and 115 respectively.

  1. Double your 9-hole index: 7.5 * 2 = 15
  2. Look up your index in the Slope Table at the course and you'll find that your course handicap is 15.
Example 2.
    PGA West Stadium Course: Course Rating/Slope (Blue Tees) 73.0/142
    Here, your 18-hole index of 15 gets you a Course Handicap of 19.