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.
(ocultar) Evita perder partidas por tiempo. Los miembros de pago pueden activar la opción "Festivos Automáticos" en su página de Opciones que de modo automático permite establecer como festivos aquellos días en los que se perdiera una partida por tiempo. (pauloaguia) (mostrar todos los consejos)