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.
(Cacher) Si vous souhaitez en savoir plus sur le déroulement d'un tournoi auquel vous participez, vous pouvez en parler avec vos adversaires sur son propre forum de discussions. (HelenaTanein) (Montrer toutes les astuces)