Dubfore: I saw that some play a lot of 9 hole games and some of the 18 hole rounds needed in the 10/20 calculations go too far back to be realistic of players form. I've changed the handicap system to reflect more recent form. Instead of the best 10 of last 20 relevant 18 hole games, I halved it to best 5 of last 10.
First off, I tend to simply double a 9 hole round and keep one handicap for 18 hole games. If there's a 9 hole game being played, I take half of the handicap.
Second ... I've also revised the best 10 of 20 and now use a table to determine how many scores to use. It makes it easier for new members to get a handicap. I copied the table from the USGA handicap manual ... here it is (for your viewing pleasure):
Taking your example ... 318 being the best 5 of ten ... say the scores were:
60, 60, 62, 65. 71 ... using your example the handicap would be 60 (or 60.1 rounded up for those carrying a decimal place).
But using the table above, I can only use the best 3 scores ... so ....
60 + 60 + 62 = 182 / 3 = 60.67 X 96% = 58.2 ... a huge difference from that 60 handicap.
One more thought you might consider ... say the above player got his low 3 scores from St. Andrews (60), Best of Famous Holes (60) and Bethpage Black (62). The 65 came from Congressional and the 71 came from Pinehurst #2.
While you may consider this player to be cheating, in actuality, Congressional and Pinehurst do play a lot more difficult than the other 3 courses mentioned.
I've completely gotten away from the "Par on every course is 60" rule. I went through an entire year of WGT tourneys and rated each course (except for Pinehurst) and came up with a course and slope rating.
This system is not for the faint of heart ... plus, if you don't have a program, don't use it. I have found that this system is superior to the "60 handicap" method.
The CC I belong to now uses this course/slope rating system. We also have a "day rating" adjustment for tourneys that are setup with easy conditions and difficult conditions. It really does make the handicap system better (although a lot more confusing to the "math-challenged" players).
I like the idea of flights (graded Handicaps) ... but our CC is a bit small to incorporate them. In real golf, most tournaments are flighted ... and the flights are usually based on handicaps.