PokerStars - 30/60 NL (3 max) - Holdem - 2 players
Hand converted by PokerTracker 4

Hero (BB): 790
SB: 710

SB posts SB 30, Hero posts BB 60

Pre Flop: (pot: 90) Hero has K 9

SB calls 30, Hero checks

Flop: (120, 2 players) 8 5 K
Hero checks, SB bets 650 and is all-in, Hero Oppo is unkown , first over push. 10euros spin.
The fact that he didn'tt raise pre may sound like he didn't have a good kicker , but he limped all the 6 hands we had played so far.

not sure what is the question here? are you considering folding flop?
but you should just jam pre

Exactly as None said, jam it in.

And given the information, that you provided, it seems like villain is limping his whole range. So he might have all of the Kx here.

Also, when a limper plays very aggro, I would get cautious. Yeah, they might come up with some random bluffs, but I expect mostly value. That being said, I am not folding the flop as played. He can still do this w K2 or even Q8, you never know. And then you will see some AA, too (not very likely, but definitely possible for such villain).

His way of thinking could be something like: Pot is small, I have a good hand, so I just shove.

Then, you will see some people who will randomly jam no equity hands here (but I would expect it from a guy who has more aggro preflop stats).

I would work on preflop game, as you can gain a lot of edge there. It's all about adjusting. For example: if you know, that guy never 3bets, you can minraise etc and overrealize your equity. Or if a guy is ISOing a lot, then mix in some traps, too. Or if a guy donks a lot, try to figure out whether he continues with his aggression on the turn, how he reacts when you raise, and also if he does that with marginal hands, draws or top of his range (this differs from one villain to another).

Btw, you said, that he limped 6 hands already - did you see any showdown? Did he cbet a lot or was he checking back mostly (these are the crucial information).

I don't think it is standard to jam pre 12bb with k9. You can do it against regs, but it is bad against fishes imho

I doubt, that EV of checking > EV of jamming. Especially at this stack depth.

Btw, you said, that he limped 6 hands already - did you see any showdown? Did he cbet a lot or was he checking back mostly (these are the crucial information).

Also, it's better if you provide information about multiplier. As people might play tighter in higher multipliers.

Iso jamming this hand will never be bad vs fish 12bb, even like 15bb.
This hand can go both ways, not like check is bad or anything, but vs high vpip I see no reason why would you let him realize equity with all kind of trash and weak hands.

And jam pre is better vs fish than vs regs, regs will be somehow balanced and wont limp/call hands they shouldn't, fish on the other hand will have way less traps and will call way more middling hands.
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And postflop I dont know what kind of fish you guys are playing but I would snap call with a smile on my face.
Its shallow and Im expecting here very wide range, 25bb it would another story.

I would prefer isoing not all in this hand (and a few others), to balance the isoing of trash.
this guy was so passive that it is just bad imho to risk

If this guy is passive also postflop than sure, take no risk and check back and play post.
fwiw gto iso with big sizing (3,5x) this hand most of the time, so thats another option but while gto calls limp/jam not sure we can do it vs fish
Also you never ever ever need to balance anything vs fish, that is just really bad.

Btw yes, I considered folding flop against this kind of super passive player that overpushes out of the blue. I think it may sound strange but usually this kind of player here either has a k with a better kicker or or pair limped preflop to trap (better than the middle pair)
Btw called, he had KJo. GG

still cant fold it even if its his first move in million years, who knows what is he thinking, this hand is way to strong to even consider folding.
just call and move on.

also it completely doesn't matter what do you do here, such a spot comes up super rarely(spot where someone is soo passive that we start even thinking about folding here), so either you fold or call adds nothing to your winrate.

Main things you should take away from this thread which will actually improve your winrate is that K9o is not std to check back vs fish, you should iso it if someone is not passive, if we are doing it at 12bb, than 11bb it very likely becomes standard to iso jam vs anyone, this will add way more ev to your winrate than if you make 100% correct decision every time in a situation like this.

And adding in op that opponent is passive also postflop would help a lot, not this time, your hand is just too strong, but if you would have smth like K2 with your current op description Id snap call that too, but after reading reads you provided later Id actually fold it.