Busted flush leaves 2-pair

[Marquis]

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"grunch"

I would have checked on the flop and called his probable bet. On the turn I would have check-raised and if he came over the top then call to a show down. If he doesn't come over the top then bet to the showdown. The only realistic hands villian can have that should concern you are A-A and J-J. Looks to me like he's playing A-K.

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You forgot AJ and AK looks unreasonable the way he played the flop.