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.
(ascunde) Dacă aştepţi după mutarea ta fă click pe "schimbă" lângă butonul "reâmprospătează" pe pagina principală,apoi setează reâmprospătează pagina la 30 de secunde,pentru aţi arăta rândul mai rapid. (Servant) (arată toate sfaturile)