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Rating is based on a players 10 round average SPH
(Strokes Per Hole) for each course where they have played at least 3 rounds within the last
180 days. The players average is then subtracted from overall average SPH for each course played. This produces the difference between the players average and the overall course average. These differences are then averaged using a proprietary algorithm to produce the rating value.
So playing well at a harder course will increase your rating. The difficulty of a course is determined by the average SPH (strokes per hole) for that course. So playing well at a difficult course will actually lower the difficulty rating of that course, causing ratings to adjust as well. This method of rating is only as accurate as the data being entered by each player. Also, there is the possibility that one course has a lot of strong players which causes that course to rate easier (due to all the low scores). A course with a lot of weaker players will rate as a more difficult course (due to the high scores). If the stronger players play the weaker players' course, they will do very well even though the course might be rated as harder than their home course. Of course this will cause the weaker players course to drop in difficulty. So, hopefully over time the system will take care of this problem as more players of varied ability play different courses.
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