Do players iso-raise short stacks at PP20? i.e., should I r-r w KQo?

[ellipse_87]

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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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UTG+1 is confident of showdown potential against UTG. UTG's range includes the entire top 50% of pre-flop hands. Therefore, UTG+1's range includes hands that are behind KQo as well as hands that are ahead of KQo but will fold to a r-r.