elyanos

Lackind details here (quality of KK, your utg range, vilain's stats BU...)
Usually open good KK utg and often fold to 3bets, this hand doesnt play well in 3b pots unless its connected or ds. Shouldnt 4bet often unless you have AKK and 3bettor is wide imo.

cb bigger flop
ultra standard broke here esp vs this vilain

any help on this would be welcome :)

1/ I would never lead here unless BTN cb really few and isn't a good player. The reason is that I couldn't balance my range unless you start donking sets and draws and kinda air like 2 BDFD. Agst a standard player I expect him to cb fairly often so I'd rather let him put money in the pot with my good hands. I would consider donking more often if the board was 2 tone since BTN would cb less often and I could rep a more balanced range.

2/ When c/ring here I try to think about what I rep first and then what will happen afterwards. Since the board is rainbow, you mostly rep 2 pair+ and wraps, maybe some J+ sidecards but you don't have many AKJ9 like since you didn't 3bet pre and these hands are fine to call on the flop anyway. Don't forget that your preflop range prob doesn't contain many 44, 88 and JJ.
Then, which turns are good for you ? With btm 2 and just 1 BDFD, there's not that many, so both c/c and c/r ain't that great. I prefer c/r to c/c since you can end the hand right away and can still play on some turns, but I'd rather c/f here without reads. I would try to look for hands which can continue on more turns, esp deep.

3/ considering BTN is reg and you want to balance your ranges :

a/ always c/r JJ, some 88 and all sets + nut draw. c/c 44 and some 88 is fine to balance and there's not much value here. I would then c/c or c/r turn depending on the turn card. If you c/r all your sets your range is gonna weight too much on the super value side since there's not many draws here to compensate, and deep being oversetted is awful.

b/ all c/r. Having a good draw compensates when behind and it mixes your range although I would be cautious that deep.

c/ all c/c since you can't gii profitably.

d/ I could c/r with a lower SPR. Here you don't want to get blown off the pot with good implied

e/ seems a good c/r spot since you don't mind getting raised. I would do it only with a nut GS, otherwise prob c/f

f/ with a nut wrap I would c/r since that deep you can call a raise. If non nutty I would keep a small pot and just call

g/ good hand to c/r fold. Hard to c/c unless you have a plan for the turn.

h/ fold total air

yup NL background

sure, I thought the stacks were deeper but if you c/r you commit yourself, then c/r is better.
I do think equitywise, I said 10 outs but in my head I give myself about 40% eq vs his shoving range.

tough one.
if you give BTN such a high card heavy range, your rundown is often dominated
if CO 4bets sometimes, you have to fold when BTN shoves
if you call and CO calls, you have bad relative position with a slightly deep effective stack
even if you flop huge, like 789, BTN can check back to realize equity, or have you dominated, and if the flop is lower, like 678, you're likely not to get the action you'd like
finally lots of pair + draw and 2 pairs + draw can be favorable but sometimes you're just dominated
thus I would fold as SB. If I were CO with better relative pose, I may call. The equity distribution agst the ranges described isn't that great but with such good odds calling is fine.

As played, BTN plays it perfectly with his sizing, I would just fold.
I may call with a backdoor FD so that there's more turns to play on ?
If everybody shoves, you have 35% agst an 8% range, and obv less agst the shoving part of his range so I'd fold.

yup I basically never pot on this turns, just had to click before time out
isn't c/ring contradictory with the pre flop call ? I mean, you called to keep CO in and by c/ring you basically push him out.
also if you get 3bet you have to fold with 10 nut outs and that really sucks !!

c/c flop to c/r on improving turns commits a lot of money and you'll probably have to fold to a raise. If river bricks, you have no showdown value.
If vilain checks back turn and you don't improve river, you'll have to bluff quite often since you have few to no showdown value.
If the turn bricks and he barrels, you have to c/f which means you will have put money into the pot without any real attempt to take it away.
Finally you can't c/c twice equitywise unless you turn the Ts or Ks, and even if you do, I don't think you have a lot of implied esp oop.
So I just prefer to c/r flop, it can at least win the hand right away for cheap.

Looks like we all agree on that then. Thanks guys.