Thad: Closest I can find is wikipedia, which says white goes first. Don't think wikipedia is official though. The original Pente game shipped with 4 different colors.
Found a few links on Go-moku and Go, which all have Black going first in those games.
I don't think there's an official rule for Pente. I'd say follow Go, Black first.
(peida) Sa võid oma sõnumites kasutada lihtsamat HTML-i või kui oled tasuline liige, kasutada ka Rich Text Editor´i. (pauloaguia) (näita kõiki vihjeid)