AA on low board vs TAG

Just open 3x in this position. Bet/fold turn.

If he's smart he'll know that you never x ott given your range from UTG if you previously had bet otf in 3way for 1/2 of the pot, in other words he wasn't bluffing and your line makes no sense to a opponent

As dadramel said your cbetting into two players so unless your randomly cbetting with AK AQ on these boards your not bluffing . People tend to barrel big hands like straits and sets here so when you check you have over pairs and perhaps some weaker made hands. It doesn't make a'lot of sense for villain to turn a hand like 99 into a bluff here as you do have some weaker made hand in your range that he beats. I don't mind check calling the turn with some overpairs as'long as your mixing in some T9s and nutted hands into a check call or check raise. The river is a check fold for me though.

I have to say, I prefer the 3x raise as well. Tough spot, although I prefer the bet/fold turn against a TAG. You're still ahead of his range, he will raise some straights and some sets, you sure are behind some of his hands, which is why I'd bet and then fold to a raise but checking allows him to take control on the hand and put you in very ugly spot since your range is capped and he has WAY more strong hands than you do, your likely better hand being exactly AA.

Cheers