5 player indian ocean.  I  had all of africa except egypt,plus I had Iraq and israel. he had the arabian area, minus the ones I had, plus egypt.

I proposed a truce and a trade, egypt for israel and iraq.  he agreed to both. 

1st turn,  I moved everything into israel, he moved into iraq.  Second turn.  israel and egypt were supposed to trade places.  I moved everything into egypt,  he reinforced egypt and took over israel.  I lost every unit that I sent there that turn, which was a good third of all my forces.  He then proceeded to launch an all out attack against me, which while I got the best of almost every single engagement,  he still had almost twice my income.  now I am about to be eliminated because this guy backstabbed me from the beginning of the game.

Now, Tzjmn has only finished 4 games thus far, and has lost every single one, which I would expect given his lack of skill in this game. 

but his lack of agression to any other player on the map suggests that either he's very good at diplomacy which I doubt given his tendancy for backstabbing, or that he's a multi for someone else.  I don't have any evidence other than his behaviour, it is very possible he just sucks that bad.