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We use a Bayesian weighting system to determine overall course ratings. This normalizes the course ratings, so that one "F-" rating or one "A+" rating will not automatically make the course the lowest/highest rated overall.
More about Bayesian average
Whichever course picture has the most "votes" is the one that will appear as a thumbnail in the course directory and on tournament pages.
Any member of the site may vote on course pictures.