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Preflop: Fine

Flop: Fine

Turn: Now this is where it gets interesting. The flush is there, but you have no real reason to think that the BB has that based on his preflop action. Its more likely he either picked up a draw to go with a pair (maybe AQ with the As or KK with the Ks as he has here) or that he want to test you again for AK.

UTG could have a flush, but its pretty unlikely since he didn't raise.

River: BB bets cause he thinks his hand is good and now UTG raises [img]/images/graemlins/confused.gif[/img]

Since you didn't raise the turn, you are now in a bad position here. That 5 isn't usually going to help anyone, but at these levels its entirely possible that someone could have something like A5 or even a set that got gunshy when the flush came in on the turn. He could also hae a slowplayed flush that he is now deciding to unveil.

I'd probably fold here most of the time unless UTG has gotten out of hand on previous hands, but its important to realize how much differently this would have played out had you raised the turn.

And welcome to the forum!