Unknown shortstacks pushing in 6-max

[Ghazban]

I've had this come up a few times so thought I'd pose the question to the board.

An unknown buys in for 20BB and sits to your left. You have a hand you want to raise with, so you open for 4xBB. The unknown pushes for 20xBB and its folded back to you. What are the minimum calling requirements for this situation?

[yvesaint]

AK, AQ, JJ+. I feel fine folding everything else, and keep an eye on him to see what kind of stuff he's doing this with.

If it's his very FIRST hand and he pushes, I might call with AJ or 1010. I see a lot of Ax here.

[Ghazban]

Odd that you'd mention TT as I called with it in one such situation earlier today. It was his first hand, he posted in the CO and pushed over top of my 4xBB raise. He had A9o

[Voltron87]

tt, aq

if its a repeated offense, aj