[kamrann]

I don't follow. I never said anything about trapping. And I don't see why the BB would have to have a very big hand to call in this case, given that he has half of his stack in already. I doubt that he would really believe you're going to call the allin after just limping anyway, so I don't think this would affect his decision much.

And you don't have to fold anyway. You don't need to have a better hand than the short stack, you just need to avoid a BB:BigStack:You order for the showdown hands in order to place ITM. I get the impression people often don't understand how unlikely this result is in general, and that when the short stack is already allin and you have him covered, you can open up your calling range hugely.