KK BB/SB 311BB 4b pot

Hello I don't know how people play at nl100, but at nl5 where I play I don't expect people to 4bet T9/AT

You are quite deep, so the 4bet range can be more wide, but ATo is still loose especially if he 4bet 4x. This check/shove looks so strong, but he can have some hands like AhJh or some other draw too, sets are also possible, maybe AA. And against straight you have some equity too, so I think calling here is definitely fine. At nl100 folding here can be exploitable, because we are on the top of our range, ATo against 4x sizing I would fold preflop. So you have only ATs and 9hTh (others I would fold on the flop) and if you fold KK here, your opponent can maybe exploit it.

You can 3bet bigger
I like the flat pre
Now I'd probably put in a smaller size on the turn so you can bet wider and maybe include some AK without a heart in your betting range, half pot's really big here given the board imo
And I'm calling it off here even deep when you can beat his valuebets it's gonna be really hard to fold
And as teh guys said all ATs and T9s should flat or play mixed pre especially with the sizing. I'd even go as far as to say that T9s should always be a flat with low SCs be in 4betrange this deep

Sucks that he had ATs I assume but you gotta live with it, I expect it to be less combos than QQ anyways and if he can have ATo I assume KQo is also a possibility and it would be a disaster if you fold vs a range that has those

No brainer allin OTT. Doubt he 4bets T9/ATo this way. Same could be said about JJ/QQ but those are way more likely imo.

Also 3bet bigger pre, we're too deep for these small sizings, probably the reason why he 4bets so big.

We are playing in position and I think a 3x 3bet isn’t to bad. As played I don’t fold top set when the straight combos aren’t 4betting to often and indeed he could go broke with 2 pair and a lower set as well and then you could win a lot of money with a call.

Cheers,
SDK1987