[ChrisV]

I generally like to back myself postflop, but this is a situation where you're just not going to have enough room or information to make a decision.

Suppose you call and MP2 calls. On the turn:

(1) BB bets out allin. Are you calling?
(2) BB checks. Are you pushing?
(3) If you check in (2), MP2 bets allin. BB folds. Calling?

I don't think the above questions are answerable.

At the risk of sounding like Hellmuth, I think I'd rather back myself to play the rest of the tourney with 900 chips than toss my stack in here and hope for the best. The cardinal f#@king rule for me in SNGs is never stack off with no outs. That said, I don't really have any quarrel with pushing or calling. If I was splitting the tournament with someone who desperately wanted to do one of those two, I'd go along with it.

PS: I think it's most likely that BB isn't beating you. However, I wouldnt write the idea off. It is quite player dependent. If you're facing me in the BB here, you are 100% looking at either 99, QQ or AK (and the first two are more likely as I may play the AK differently).