Based on the rule here, it says "5 or more" ... I am in a game right now that the opponent has a chance to place 6 in a row ... but he/she hasn't do it yet ...
(sakla) 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) (Bütün ipuçlarını göster)