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!
(peida) Sa võid oma sõnumites kasutada lihtsamat HTML-i või kui oled tasuline liige, kasutada ka Rich Text Editor´i. (pauloaguia) (näita kõiki vihjeid)