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UTG+1 obviously has a hand which he feels he has showdown potential as he's trying to isolate UTG. What hands could he possibly have that are behind to your KQ?

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This is a $20 not a $215, you're giving your opponents WAY too much credit. I doubt UTG+1 is folding to a re-raise here, calling standards are way loose. Also you're assuming UTG+1 realises UTG's range is top 50%. I don't think he'd pull this move with QJ, JT etc... I mean, would you? In my opinion MY range for re-raising UTG+1 here is TT+, AQ+... you have plenty of chips to let this one go.