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River: I'd call. UTG's turn bet could mean he has something less than a flush (a lot of people don't raise KQ PF), he probably has no idea you've made a straight, and you're getting 8:1 odds.

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I doubt he would have checked the flop with one player to act but it is possible. I think most times he'll show a flush but I'd still call him as it might be a wierd 2 pair for UTG or even the occasional bluff-raise (someone actually did this to me twice last night in 1-2 6 max).