Its a rough spot, when you are deep, but I tend to agree with Brett R. His value range is very thin, since he should not be calling to many suited hands out of SB against an UTG open. He should be pocket pair heavy or have hands like KQs/KJs/QJs, which are kind of to good to fold, but if he 3-bets out of position, he mostly gets action from better and fold out worse.
So how many flush combos can he even have? And if he did make a casual call with J9s or 98s, would he even pile it in like this? If he can only have like 3 combos for value, and there is any chance, he might be bluffing with Kc or Qc, or overplaying a set, then this has to be a call.
It sucks, if you ran into a flush over flush, but rather than folding I would prefer to have taken chips of the table and not sit with 200+ BB. Coolers are more painfull, when you get taken for 2-3 buyins at a time rather than just 1. If you are playing 10NL Zoom, you are probably practicing or trying to build your first bankroll. And in that situation is there really any advantage in playing deep? Speaking from personal (painfull) experience, I would say no.
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