[Tilt]

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I think there is good chance he will fold a medicore flush. He also might call with a set.

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????

If he cant fold a set here, why is he going to fold a K high flush?

If you pot the river your bluff has to get him to fold the flush 50% of the time to be worthwhile. If you checkraise the bluff is going to be very expensive. And if he has a set and doesnt buy that you have a better hand, you are going to be in a very difficult situation when he reraises you.

If you check-call you can get an affordable showdown, and you can induce and pickoff bluffs as often as you pay off the flush IMO.