The spirit of golf lies in proper
handicapping. The source of equitable handicap indexes is an accurate course rating
system. PGA Vietnam follows USGA principles and ratings. Know Your INDEX  And How To Compute It!
1. By Differentials. A handicap differential is the difference betweeen the adjusted
gross score and the USGA Course Rating, multiplying the difference by 113, dividing the
results figure by the USGA Slope Rating and rounding off to the nearest tenth. The
following is an example for a course with a 71.5 Course Rating and a 130 Slope Rating.
Adjusted gross score
Course Rating
Difference
Handicap Differential 
95
71.5
23.5
113 x 23.5 divided by 130 = 20.4 
The value 113 in the above formula is the USGA standard for Slope Ratings and is used
to weigh differentials.
2. INDEX Formula. Lowest 10 of Last 20 Differentials. The INDEX is computed from
the lowest 10 of the player's last 20 rounds as follows:
Total of 10 lowest differentials
Total averaged
Total multiplied by 96%
Delete all numbers after the tenths digit
USGA Handicap Index is 
147.9
14.79
14.19
14.1
14.1 
If you have fewer than 20 differentials available:
Available
14
5 or 6
7 or 8
9 or 10
11 or 12
13 or 14
15 or 16
17
18
19 
Used
No INDEX issued
Lowest 1
Lowest 2
Lowest 3
Lowest 4
Lowest 5
Lowest 6
Lowest 7
Lowest 8
Lowest 9 
Equitable Stroke Control
Equitable Stroke Control (ESC) is a procedure whereby abnormally high individual hole
scores are adjusted downward prior to the score being posted. ESC sets a maximum number
that a golfer can post on any hole, depending on the golfer's Course Handicap (not his
Handicap Index). Beginning on April 1, 2000, PGA Vietnam's HDCP computer began to adjust
individual hole scores for handicap purposes per the following table:
EQUITABLE STROKE
CONTROL 
Course Handicap 
Maximum Number
on Any Hole 
9 or less 
Double bogey 
10 through 19 
7 
20 through 29 
8 
30 through 39 
9 
40 or more 
10 
REMEMBER  VGCC Members and Non  Members receive monthly
INDEX updates that can be attached to plastic Handicap cards. Members can review their
posted scores monthly via Internet: www.pgavietnam.com , or by requesting a copy of their
current scoring history from the Golf Operations Office. Peer review is a vital part of
the handicap system.
