[XCEO]

hand 1: if villain is a only a little good at poker he can but you on an overpair, when the 9 falls on the river that is obviously the most scary card for you and he knows it. So either he thinks that you can fold AA or he thinks you can't. I think this is a 9 most of the time, but he makes it look like a bluff. I fold.

hand 2: I check and probably call. I don't know if this is good or bad, but there are a lot of nice turncards for your hand.

hand 3: I fold the turn. I don't see many players bet like this with a worse hand than AK. But that's probably because I fold here almost always.

hand 4: I think this is okay and I call a push anytime.