The game of Diplomacy I won, I won through an enforceable side contract (which lost me a friend and got me some accusations of cheating, but this is par for the course for a good Diplomacy game). I was Britain; my friend H was France... A lot of people made fun of me for this, including H, but in my defense I did end up winning the game.

I strongly agree with this Newbies' Guide:

You must always play each game fairly to give each player an equal opportunity to do well… don't sign up for a game with your best friend and have an unbreakable alliance from turn one... winning in these situations does not say anything about your skills as a Diplomacy player, only that you can win by cheating (well duh).