re: Poker & $10 NLHE 6-max: Folding KK (overpair) to a 103bb river bet
It's really hard to assign him a range, given the strange preflop action. Tbh, I think a reg that is playing Zoom style tables almost never have QQ/JJ in his limping range from MP. BTN/CO is going to isolate a ton, limp/rr with QQ/JJ is pretty dumb, and if they flat OOP with QQ/JJ, they are going to be in a pretty crappy spot on many boards. Just open-raising QQ/JJ is always going to be more +EV on Zoom, so I don't see that many combos of QQ/JJ in his range. I might assign him like .5 or .75 combos of each on this river.
In my opinion, you're more likely to see suited broadways and especially pocket pairs. I think deep-stack regs on Zone that cold-call/call 3bets wide because I am deep as well are annoying. They think they can outplay me or something, or get me to stack off 200-300bb deep with AA/KK (which isn't even a large % of my 3-betting range). Once a 300+bb deep-stacked reg in the SB cold-called my BTN 3-bet with 88. I had JJ. Flop J84dd, he donks 80% pot, I raise, he 3-bet jams. Like does he seriously think I have AA/KK/QQ in my flop raising range and stack-off range for 300bb+? I've seen tons of deep-stacked regs call 3-bets wide with pocket pairs when I 3-bet, especially cold-calls. It's usually 77-QQ. They can have AK/AKs too because they don't want to play a huge pot deep-stacked with AK, especially OOP.
I'd say flop bet should be smaller because it's a 4-bet pot. 33-40% should be okay. Around 40% for turn and folding to a raise. Checking back river once called though. As played, I think we should call river. Not too happy about it though. Without the Kh, it's almost a snap-call. We only need to be right less than 30% of the time, and your hand is underrepped.