I would actually suggest that the option SHOULD be placed on the 19x19 board. Remember, the 13x13 board is ONLY here to accommodate the WebTV users.
As far as ratings go, I agree with Dmitri that it is a problem to use restricted and unrestricted games together in calculating a single ranking. I disagree with his suggestion of only allowing unrated games for the unrestricted variant. That’s not right. Creating a separate game on the site would work. How about calling it Original Pente, since that’s how the rules originally were. :-)
(verstecken) Wenn du auf einer Persons Name klickst und dann Beendete Spiele erscheint eine Liste von Spielen welche die Person spielt. Nun klickst du auf ein Spiel deiner Wahl um alle beendeten Spiele dieser Spielart zu sehen. Wähle nun Spiele aus dieser Liste um diese zu analysieren. (Servant) (zeige alle Tips)