[Rah]

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yes, cap that preflop.

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Why are all of you so eager to cap this preflop? Worst case scenario, hero is up against AA/KK and a giant dog. Best case scenario, one QQ/JJ and one AQ/AJ in which case hero is still a dog. Capping won't isolate, since someone calling three bets cold will also call four bets cold. Yes, AK is suited, but that doesn't add so much value that capping is warranted here.
Capping will also make sure that we aren't getting more info on UTG who may cap if hero won't.

All in all, this "always cap with AK" attitude is strange, especially without motivation. Seriously, if there is any time when AK should not be capped, it is in UTG+2 facing three bets.