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One thing about the river is that the board double paired and he may be betting to force out another Ace thats gong to split. Then again I don't know if players at 15/30 bet/3-bet the flop and lead the turn with overcards. Its perfectly reasonable if he has a AK[img]/images/graemlins/heart.gif[/img] however...

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I believe there are many players/lags on party that will take this line even w/o two big hearts. With no read on the villain, I am comfortable calling this river in this large pot.