HJ is a fish

NL $20 WSOP Nevada 5 handed

SB (Hero) 20.10
BB 19.80
HJ 17.99
CO 23.64
Button 9.29

Hero is on button with KK

HJ calls .20, 1 fold, Button raises to .90, Hero raises to 2.60, BB folds, HJ calls 2.60, Button Folds

Pot 5.95 Flop 2A9

Hero checks, HJ bets 6.30, Hero folds

My thought process was to check a dry board as I am way ahead or way behind. Once HJ pots here, I think it is safe to exploitively fold.

Anyone think I can call here? Additionally, any arguments for betting flop?

it's fine

Seems wp.

You need to gather info on the fish. Is he stabbing a lot when you don’t Cbet ? Does he have sizing tells ? Or is he really passive and calling you down with 9x but playing aggressively his strong hands ?

Just play exploitatively

i like betting 1/3

You've got loads of Ax in your range (even AA) and 99 that can check the flop. Since villain is bombing it, I think it's fine to check-fold your underpairs.

Just make sure that if you're checking KK-JJ on this flop that you also check some Ax to "protect" your checking range.

Such spots can be a gold mine if you gather decent info on fish tells. Majority of them after your check are soooo concerned, that ace they just hit won't get paid that they bet smallish or check back. Betting near PSB may be some 7 high thinking you don't have an ace and its gonna throw you out. Forget GTO here, reads is all you need, I've won numerous stacks in copies of your hand.
Don't try it vs regs obviously
Edit: Missed the fact that it's 3bet izo spot, it's a fold then.

Arty, when you suggest we check Ax hands, what do you have in mind as played? I am never 3 betting AJ or lower here pre so my range is super narrow. If I am only betting 3 combos of 99 here then am I bluffing with only 6 other combos? Now I am wondering if I should have bet KK or QQ as a bluff to balance out a narrow value range of 99

You're SB right, not BTN?

If you only 3bet AQ/AK and QQ+, you'll have 12 KK/QQ combos on this board. 18 combos of underpairs if you also 3bet JJ (which I think you should against a limp and iso).

So you have 12 AQ and 12 AK combos, and 3 AA combos. You can bet with AK and check with AQ/AA.

So you have 15 AQ or AA protecting your checking range of underpairs. But if you bets, 18/33=55% of the time you'll have some issues and you'll lose too much money if you just x/f your underpairs.

Against villains you have history with, I'd actually cbet JJ too sometimes, if you know he'll 4bet AK always (though a lot of players mix it up and sometimes flat in position). Such a villain might want to fold QQ and prefer to call with 9x since it'll have 5 more outs against an ace. With JJ you're incentivized to fold out KQ right there and you block AJ which would be one of his stronger top here. Villain should be capped to AJ/AQ/99/22 (does he isolate with 22 though)? Rainbow flop so only 2 combos of A9s and A2s suited each. Especially JdJh, JdJc: your jacks that reduce his AJs to only 1 combo.

I'd expand the 3betting range a bit more in this spot. KQs and AJs should also be 3bets here. 99 is a little light but TT will often dominate a lot of HJ iso hands, suited connectors in the 3bet calling range. And you're in good shape against his suited broadways like KTs/QTs/ATs/JTs.

Should be 3 betting 77+, ATs+, A5-A2s, AJo+, KQo, KJs+, QJs, JTs, T9s at a minimum, I also 3 bet bigger, flop is good

I would make it bigger pre. Post is fine.

Why are you going full GTO vs not full stack + hero saying villain was fish?

Flop overbet tho

If there was no limper, you should be 3-betting every Axs, plus AQo+ in the SB v BTN.
As there's a limper in the pot, you probably want to dump some of the bad Axs (A9s-A6s), as you'll probably get called quite often, but with AQ+, ATs+ and A5s-A2s in your range, you've got plenty of Ax that can check flop.
As it was the limper that called, I'd just bet AJ or better (including A2s) for value on the flop, and check with ATs, A5s, A4s, A3s (and the underpairs). I'm usually checking top set as well, but occasionally I'll bet small with that and hope villain makes a random raise.