[einbert]

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UTG is a rock

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I call a river raise.

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Huh? If your read is that UTG is weak-tight I think bet/folding the river is the best idea.
Then again, you only have 75 hands. So I agree that calling the raise is prudent, because of the small sample size.

Since MP1 is bad and you 'expect the button to come along', I would strongly consider threebetting. Position in pots like this can be quite powerful.

I only raise this flop if you have a stronger read on UTG. If he's very passive it's probably fine, otherwise I just call.

NH otherwise.