[Octopus]

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I can't imagine that even Uberfish don't re-raise KK at UTG+1 so ...

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I see this kind of thing not infrequently. People don't like to raise pre-flop and like to 3-bet even less. The thrill of trapping is what draws them to the game. I am not suggesting that UTG+1 has KK, but I would not eliminate it as a possibility.

That said, getting 18-1 closing the action, this is an easy call.