[registrar]

You know this guy is going to fire the river if you check-call turn and then check to him again so, as played, call. If you don't want to call the river, but do want to call the turn, then block the river. He won't fold AJ very often but at least you can set the bet size.

Edit: FWIW, though it's been a while since I played on Prima, I'd have led the flop. It's not good poker because checking the turn (I'd double barrel this one) means he'll take it away but we don't have a stack, board or holding to snap off bluffs over three streets, so I'm happy taking it down or otherwise, and cheaply, off the bat.