Ratings are generated initially from the Badminton America app through a self-rating survey. Once a player has a rating, they may play other rated players and record the results in the app. Each time a player records a match result in the app their rating will be adjusted based on the score of the match, the strength of their opponent, and the strength of their partner in the case of doubles. Our rating system is different from others in that it is based on expectations.
For example, if you are rated lower than your opponent then you are expected to lose a game against them. In some cases, if you lose the game but keep the score close you may still increase your rating, and your opponent's rating would decrease. The opposite is true where if you lose by a larger margin than expected your rating may go down more significantly. What our rating system does is it ends up stratifying players into certain absolute levels as opposed to other systems which are more based upon relative strength.
Because of this, and because points are gained/lost based on performance relative to expectations, every point matters in every game. Even if you are greatly outmatched by a stronger opponent you still have a chance to improve your rating as long as you outperform your expected result! In games that might otherwise be predictable, this has a way of keeping them interesting and is comparable to a handicap system.
You'll see some changes on the app. Ratings are now stored for both singles and doubles and your profile shows both. We are building filters and toggles to show ratings for both singles and doubles. Let us know what you would like to see! We'll compile results and tee it up.