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)
furbster: Another way would be to require them to be placed in a certain order. Queen first, then Rooks, then Bishops, then Knights, and the King last. Or the reverse of this scheme.