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Code Changes Required to Support 2020 World Golf Handicap System
Assuming the developer(s) take a peak at the forum - here is a brief list of changes required to update the website to support the 2020 World Golf Handicap System.

At a minimum the follow must be implemented:
The 9-hole handicap (aka designated with a lower case “n” – i.e.: Handicap Index(n) = 15) is gone.  All handicaps (index, course, playing) are based off 18-hole differentials.
If only playing 9-holes -- two 9-hole differentials are combined to create a 18-hole differential which is use in all future handicap calculations.
An uncombined 9-hole score is discarded after it becomes older than the twentieth oldest 18-hole score
Rules: 5.1a & b Calculation of a Score Differential

Maximum Score for Handicap Calculations
Equitable Stroke Control has been replaced by “Net Double Bogey”
Rule 3.1b

Course Handicap – Change in calculation to include PAR 
The Bonus for Excellence (aka .96 multiplier) is gone
>> 18- hole << Course Handicap = Handicap Index * (Slope Rating / 113) + (Course Rating – PAR)
Rule 6.1a
>> 9-Hole <<<< Course Handicap = (Handicap Index / 2) * (9-hole Slope Rating / 113) + (9-hole Course Rating – 9-hole PAR)
Rule 6.1b

Playing Handicap
>>> Same Tees <<< : Playing Handicap = Course Handicap * Handicap Allowance
Rule 6.2a
>>> From Multiple Tees w/ different Pars <<<<:  Playing Handicap = (Course Handicap * Handicap Allowance) + Difference in pars
Rule 6.2b

New 2020 WHS Requirements that I really don't care if implemented or could be phased in over time.

Playing Conditions Adjustment (PCC)
Adds a course conditions value(-1 to +3)  to the score differential calculation
Rule 5.6
 
Low Handicap Index (ties into Soft & Hard Caps)
Rule 5.7
 
Soft & Hard Caps for Player’s Handicap Index
Rule 5.8
 
Exceptional Score Reductions
Rule 5.9

Hoping this can be addressed in time for the 2020 season.
Author: Richard Tawes
45 days ago   2019-12-06
Nicely done.. Author: chris magnuson
44 days ago   2019-12-07
Am I missing that the new handicap calculation is now based on the lowest 8 scores out of the last 20. Previously was lowest 10 out of 20.
I think I can implement most changes in the handicap settings of my league manager page. i.e. lowest 8 out of 20 and eliminating the .96 multiplier.
The net double bogey rule however will be problematic if done manually and not by a system update,
Author: Dick Ulrich
43 days ago   2019-12-08
Agreed, the net double bogey rule is going to be needed.Author: Joe Jackson
3 days ago   2020-01-18
 
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