For posting: - invitations to games (you can also use the New Game menu or go straight to the Chess Invitation) - 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)
pawnme: I would agree except I would exclude extinction, anti, and knight relay. I don't think these variants have anything to do with chess skill. I however think that performance at other games of skill (like Jungle) can be a good indicator of critical thinking skills (and as far as I know there is no jungle engine, if there is one someone please correct me).