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) Vous n'arrêtez pas de perdre au temps? Les abonnés peuvent activer les Vacances Automatiques pour mettre un jour de vacance lorsquils risquent de perdrent au temps. (pauloaguia) (Montrer toutes les astuces)