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Pythagoras: Now, with Fencer's answer, I am sure you can work out how often it should happen ... looking foreward to hearing the result ... all the best :)
(hide) If you want to play a game with an opponent of a similar level, you can define a required BKR range for a new game invitation. Then nobody with a BKR outside this range will be able to see/accept it. (Katechka) (show all tips)