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!
(ascunde) Dacă te uiţi pe o tablă de discuţii regulat poţi să o adaugi la tabelele de discuţii preferate mergând la tabela de discuţii dorită şi făcând click pe "Adaugă la tabelel mele preferate". (pauloaguia) (arată toate sfaturile)