for regular go-moku (which this is essentially the same) i have never played on a board bigger than 13x13. They use that at IYT...i have played approximately 200 games of that and 2 of them have filled up, both agaginst the same person (lol). 15x15 would certainly be big enough though imo!
(verberg) Wilt u meer partijen spelen, maar kunt u niet beslissen welk speltype u het liefste wilt? Neem dan deel aan een toernooi waarin het te spelen speltype willekeurig wordt bepaald. (pauloaguia) (laat alle tips zien)