This hand takes place in lv1 4. Starting stacks were 50k and it is now 200/400/50.

BTN is Czech reg, looks about 25 years old. We are both unknown to each other. We only played 3 1/2 hours together so far but he seems very good to me (i feel i had an egde on the other 6 players at the table), but it was by no means super soft. He has been very active pre-flop and has shown down a couple weaker hands.

I haven't been crazy, and haven't been in that many postflop spots at all - I have only played in 1 sizable postflop pot which I think I took down without showdown. I have however been 3betting quite a lot, particularly against this guy who is opening in all the right spots. I also cold 4bet him for MP in lv1 (100/200/25 8 handed) in a a great spot where he tank-folded and I showed him the 3 of hearts.

BB is French and look like a billionaire, about 60 years old. He is not good, but has not done anything retarded yet and seems quite tight. I think this is the first time he cold-calls a 3b.

BTN 36500
SB (hero) 57k
BB about 55k i think

200/400/50

BTN opens to 900

I 3bet SB to 2600 with a pair (I think I could even go a little larger from the sb vs a good player?)

BB cold-calls quite quickly

BTN thinks for a while and makes it 7850, leaving about 29k behind - this is the first time in the mtt he has 4b anyone i think.

What do I shove here? What do you think of his sizing? Looked somewhat weak to me and I felt he might go a little smaller with kk+?

I feel that he can flat pre with a lot of stuff that plays well postflop, so I wondered which type of non-nutted hands he would 4b.

what is my shoving range?

BB: QKs+/77-JJ/AJs+

His sizing seems very weak and awkward and with the information you've been given he could make a play on you? Or could he be aware that you're a thinking player ---> and you would figure this bet out as weak while it's KK+?

Shoving range depends on your read and feeling while youre in the hand and what i said in the previous phrase. QQ seems close KK i would tank-shove and AA flat.
When u got AA (prob KK too) give him a postflop rope to hang himself.

Preflop 3b: 900 --> 2.900/3K-ish?

ye, 2900 is better pre. I personally dont think I have a flatting range pre here and it would just look like AA if i flat i think. Only plus is i guess the old guy in bb might also flat with a lot of his range if i do.

You don't have a flatting range pre? Anyways ya def bigger preflop. I think hes light here a lot, and the BB is prolly going to fold everything so I think shoving with a pair here is fine, no guts no glory.

ok maybe not 0% flatting range, but def very small one esp when he makes a larger sizing

also, (obv player dependent) do you think in general the old rich guy a)flats jj/qq/ak preflop b)folds them if i shove

I think charder was talking about no flatting range for the 900 open, not the 4bet. I'm guessing you do have a flatting range for that lol.

i know who btn is and I would shove quite wide, prob all pairs I'd 3bet light and bunch of Axs

I think the French guy has exactly TT-JJ AK more often most people in this scenario since that's how French old people play. They don't really trap AA-KK in spots like this very often imo, usually it's what they are telegraphing it to be and they'll fold to a shove.

You said you have a pair, it doesn't sound like villain is going to have (m)any small or medium pairs in his 4bet range since he could just take a flop and setmine in an extremely favourable spot since he's gonna get huge value almost always when he hits. Therefore I don't think it's that big of a deal to argue whether you should shove 22+ or 88+, pretty much just a case of whether you only want to shove nut hands or not. Sounds like a perfect spot to shove 22 IMO and I'd probably do that.

This is exactly how i felt and thought within the hand and immediately after. Was annoyed at myself that I folded 88 and I told the Czech guy I had 55 in the break because we both knew it was obv a great spot. I planned to 5b ship on him but went with my 'live read' and folded. If you are reading please let me know your exact hand. Was a really cool hand in the end, and I got the impression you had a low Axs and played it very well post flop.