[Robb]

[ QUOTE ]
Hero is SB with A9o. Villain is Button. CO posts. Folded to button he raises. I 3 bet. Everyone folds and button calls.

Flop is 9 8 7 rainbow

I bet, Villain calls

Turn is 6 completing rainbow

I bet, Villain calls

River J

Hero??

[/ QUOTE ]
I think if your opponent was going to bluff raise/semi-bluff raise it would have been on the turn so I like a bet. The J is scary because it's a likely card to pair a drawing hand. But if you bet the river you are representing an overpair or a straight and I think you can safely fold to a river raise ....while a pair that you have beat may check behind if you check. And I do think opponent will call the river with one pair if he/she called the turn.

If opponent has any bluff river raising tendencies then I like a check call.