In order to make this feature as simple as possible, the general rule on BrainKing.com is that the white player always starts a game (for all game types).
(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)