did you ever play diplomacy?
my good god, that board game is a quick way to lose friends and destroy families.
you all have to plan your moves at the same time, and write them down in note form. Then all the moves are revealed and all consequences are played out. The brutal part is that during the planning stage you can request private meetings with any other players in order to ally or bluff or whatever you like and try to play everyone off against each other. Its insane. people die