For posting:
- invitations to games (you can also use the New Game menu)
- information about upcoming tournaments
- discussion of games (please limit this to completed games or discussion on how a game has arrived at a certain position ... speculation on who has an advantage or the benefits of potential moves is not permitted)
- links to interesting related sites (non-promotional)
Sumerian: I think as there is plenty of opportunity for diversion from any course there doesn't need to be a kibitzing rule. After all, there are a lot of sound first, second, and so on moves from almost any of the initial positions, so the play is largely a matter of taste. Also, correspondence is set up to allow maximum thought and opportunity for research for each player.