Nothingness: the short answer is no. they can however force you to choose between resigning or doubling the value of that game, it's your choice but you do have to choose. At the bottom of the page of this link http://brainking.com/en/GameRules?tp=23 is a more detailed explination
(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)