That seems like a bad river card, live 20/40

[W. Deranged]

I think a tilting tightish player is probably convincing himself to call down with a pair here on the turn most of the time. The only other thing he could be thinking about would be waiting till the river to raise an A, I guess. I don't think he has a flush draw given the delay.

Are you totally confident your opponent would not bet a 9 or other pair if checked to? Probably not. Seeing he called with those hands on the turn, he seems committed to calling on the river. The chance your opponent has a J with his pair or whatever is one I'm willing to take.

Bet-fold.