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"Luck plays no part in Diplomacy. Cunning and cleverness honesty and perfectly-timed betrayal are the tools needed to outwit your fellow players. The most skillful negotiator will climb to victory over the backs of both enemies and friends. Who do you trust?"
-- Avalon Hill

Diplomacy online in a nutshell

It's a multiplayer, web based implementation of the turn based strategy game Diplomacy by Avalon Hill, in which you have to try and conquer Europe. To win you have to be strategic and diplomatic, making deals and alliances with other players, and stabbing them in the back when it suits you best.