[tizim]

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isnt his play in line with alot of Ax type of hands that youre ahead of? i think alot of players would bet this river with ace high even after the turn action.

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Your thinking here's inconsistent IMO. If he checked Ax on the turn, it indicates that he doesn't want to get semibluff-raised and would rather induce a bluff and get to showdown cheaply. Why would he all of a sudden bet the river? Maybe he thinks he has a valuebet, but that's very unlikely.

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he could of course have a flush draw.

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People in bluffing/semibluffing mentalities rarely ever check these turns unless they're checkraising, and only the maniacs do that.