I estimate the ranges of the raiser, 3-bettor, and any callers and cap accordingly. I can cap petty lightly against LAG ranges.

But unless I am up aganst super-nits who have exactly AA-KK, I want AK in my capping range for balance as well as other reasons- it gives them a hand to put me on when I have them beat and want them to call down.

Gotcha...I've seen these guys. Most of them don't raise QQ-, either, but I agree that might slide a little given his position.

The question on the turn then becomes what are the chances of getting CO to fold his UI AK? As long as it's non-zero, you should b/f. You're putting in the same number of bets no matter what (even if you knew he bet 99 on the turn, you're not folding), and you're giving yourself more options on the river.

And, since I brought up the river, this is exactly the problem we were worried about. If you just pulled ahead of him and you bet he's folding (there's now nothing in your preflop capping range he's ahead of). Similarly, if you check he plays his hand perfectly because you can't fold a possible chop.

So, get in your time machine, b/f the turn, and induce a bluff on the river. What? You don't have a time machine? Curse yourself and check the river, then punch yourself in the nuts when CO checks behind and tables JJ.