Diplomacy - The Game of International Intrigue

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Hints
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Never start a two-front war. For example, when playing 
Germany, ally with either France or Russia while you 
attack the other; you'll never accumulate enough resources 
to support an attack on both. 

Master the concept of "support." Live it, breathe it. 
In a game that only allows one unit per territory and 
in which all units are equal, knowing how and when to 
support your attacks is critical for military success. 

Learn the AI. Often, the AI will begin the game with 
the same moves: France moves west, Austria-Hungary south, 
and so on. Learning the computer's tendencies can make 
your life much easier. For example, form an alliance with 
France on the first turn. Let the French move on Spain and 
then attack their undefended eastern borders in the second 
turn. 

Submitted by RickHH