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.
Hi,
5inLine is based on gomoku/renju games, and there is standard "black begins" in these games. Is it a big problem to set black color for the player whith the first move?