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)
Doerdich: You get up-to-date information in both cases: after your move and after the move of your opponent. After you make a move it is best to chose "Move and stay here" option to see what is changed.