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This villian has an AF of 1.0 in short handed games. He's not betting anything hero beats here. If BK checks and the villian bets, its a clear fold.

He might, however, call w/ a whiffed A-high not believing hero donked a pair. If BK is putting one bet in on this river, it needs to be as the bettor.

lf

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Even 1 AFs find it hard not to bet a checked river with just with ace high when the obvious draws miss.