I prefer games that tend to test your friendship lol. If you are still friends at the end of the evening, you have a strong relationship :D
I would go with: Poker (any variant, but Texas Holdem is probably best) or Diplomacy (a game of dealing, backstabbing and strategy) or Junta (a more light hearted and comical game also of dealing and backstabbing, set in a banana republic).
Otherwise, I could also consider something based around roleplaying. Not the hardcore stuff since its not for everyone, but something like a host a mystery type thing if you know what I mean.
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