I agree southpaw,  I reckon I'd fold too mainly due to the perceived strength of the SB flat call.  You're likely to run into any broadway combination that could potentially do some damage. Given your stack size, better err of the safe side and I'd wait for a better spot.

JJ can be a fickle hand at times…

wow, im the only one think this is an insta iso shove. how nitty are we becoming as players…..lol but seriously i do think this is an insta iso shove here.  as mentioned, btn shove range is pretty wide and for sb to just call makes his hand not as strong as well unless he's sitting with exactly aces or kings and looking to trap with his monsters but if so its a cooler in this spot. lot of dead money in pot iso shove is optimal in this spot. if positions were different…  shover was utg, caller was mp2 then i could look toward the fold bttn. but positions as they are i think this is ezy iso shove.

bjizz

One thing to keep in mind here. The SB flat is not as strong when there is only one person to act behind him. He might be calling the all in with a standard calling range here but chooses not to iso because there is only the BB behind him whom is likely to fold. If it was an early position all in and a MP flat with a bunch of people to act behind then I think that is mega strong.

Here, because I think he is just not thinking the BB will wake up with a hand and we are way ahead of a standard 18bb calling range here, I am jamming it all in with a fist pump!

initially i thought i'm getting it in and folding was way too nitty

then i convinced myself that flatting and raising were both less optimal

but without over analyzing – we have an 18bb shove which we'd call gladly, and the SB flat either means he's got the bottom 3/4 of the calling range against an 18bb btn shove OR he's got exactly AA as hawkeye stated

i really think if he has JJ,QQ,KK or AK he iso's all the time

realistically the ONLY hands SB flats AND calls our 4bet shove are AA and possibly KK

so i'm getting it in also

great analysis, thx guys

unfortunately i folded 🙁  but when i reviewed that hand it seemed soo clear that he (sb) was not strong  and i instantly thought this should have been a shove – but i knew already which hand he had so it was good to hear from most of you the same analysis!!!  i guess a main reason was also, it was a pretty high buy in for me (200$) and so i played too much “pussypoker” 😉

btw kott had 88

and the btn had A3s