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!
(gem) Brug Notesblok til at se hvordan din profil vil se ud med html attributter før du tilføjer den. (kun for betalende medlemmer) (rednaz23) (vis alle tips)