Only paying members with Brain Rook or higher membership level can create unlimited number of stairs in the fellowships they own (it means that they have the Big Boss rank there). These stairs are accessible to all members of the particular fellowship.
(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)