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A lower pair.

Most players will lead an ace on the river if they have AQ or AK.

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Seriously? Don't you think they would be betting that flop if they had 99-KK? Even passive players know to bet with overpairs. And not a lot of people raise 77 or lower UTG+2. I think A[img]/images/graemlins/club.gif[/img] is very likely here, and they may not bet their one pair because they are scared of the flush or a higher kicker. If you can fold when check/raised, you need to be good somewhat more than 33% of the time, since it's not real likely that both will call this river, and I'm really not sure you are.

Certainly not betting this isn't a giant leak, like someone stated. It's certainly a bigger leak to misplay this by bet/folding a winner or bet/calling when behind. I'd want a good read on my opponents to consider betting this.