Well:
"When the players got stronger they found that playing with "completely free" rules was in great favour of Black (the beginner of the game). It is also proved that there is a sure win for Black when playing with "completely free" rules."
(from http://www.renju.nu/r1rulhis.htm)
The rule "no-more-then-five for black" is one of "black" restrictions in renju.
(скрий) Играйте в реално време с противник, който е на линия! За да е възможно това, трябва Вие и Вашия противник да изберете "Премести и стой тук" за постоянно и после презареждайте страницата с клавиша F5! (TeamBundy) (покажи всички подсказки)