This hand is pretty typical for Zoom, because stacks are often deep, and then a set over set cooler can get really expensive. As BB I would typically go for a check-raise on the flop or the turn with my flopped quads. This is a great situation, because nobody assume, that BB called with a 2 in his hand, and UTG can easily have hands like AA, KK, AQ, KQ or even QQ, which love this board.
As UTG I am definitely calling the donk bet on the flop, and I am also just calling, when I make a boat on the turn. My plan would then be to bet the river if checked to, and to raise if facing another bet. However when BB overbet the river, the hand become kind of strange, and I think, UTG should just call. BB is saying, that he also has a boat, and hands like Q2 or J2 should not be in his range, so he is basically repping 22, QQ and a weirdly played JJ.
I am never folding here as UTG, but UTG have to ask himself, how likely it is, that BB is overbetting the river with a flush, AND that he will call a jam on a paired board, when we are 400BB deep? Yeah if he is a crazy fish, then maybe. But if he is one of those nitty Zoom regulars, then UTG lost a lot more, than he should.
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