this one was @#$%^&ed...25/50 set on a one card straight board...

[PokerForMath]

W/O more info, I call and expect to win enough to be profitable, but don't expect to win every time.

Do you have PA HUD? Any stats on his river play, how often he cr's river, how often he cc's river vs bets river?

One thing for sure is I don't see a lot of extra information in his cr. I mean that likely if he does that he is bluffing some of the time and has it some of the time. Broken flush draw, made straight, bottom pair thinking you have busted AK. So I see no reason to bet river and then fold to the cr. He has good reasons to bluff cr, fake a bluff cr depending on the level of his game.

Turn: I check behind the turn most of the time b/c it's the perfect cr shove situation for him and at that point you have nothing.