Introduction: Game Theory and Peace.- Strategic Decisions: Game and Strategy: Extended Game Theory.- Game Theory Encourages Peace.- International Accords.- Game Theory as Part-and-parcel of Social Science.- The Game Theory of the European Union versus the Pax Romana.- Playing the Game of International Law.- Mutual Threat: The Game of the Cold War.- Equilibria in Games of War and Peace: Options for Cooperation.- The Game not Chosen: Equilibria of Games about Games.