re: Poker & €20 NLHE 6-max: QQ OOP 4bet pot
Just fold. When he barrels the turn here, he has KK/AA/AKdd a vast majority of the time. Jacks and Tens would flat IP here with deep stacks. And all his air should be giving up OTT, as we have a pretty strong range when we check-call OOP on a dry board. Even if we're against AKdd, he has 32% equity against us, and against KK/AA we're pretty much dead. And even if he has AKdd and misses or the occasional air, he might end up jamming on a scare card OTR due to our capped range.
It's good that you realize that if you call here, you're pretty much pot committed, and he's most likely going to fire the next barrel. Calling 3 barrels for 150bb with QQ is pretty gross, unless Villain is a total maniac. We pretty much beat nothing OTR when he fires, and putting in 2/3 of your stacks just to fold is pretty bad.
Also, folding pre is fine too. At 20NL, 4-bet ranges are super narrow and are almost always AA/KK and sometimes AK/QQ, even blind vs BTN/CO. I've had about 60k hands at 25NL, and they play pretty passively. At 50NL, from the past 4 sessions I played, I think we need to stack off/5-bet jam QQ/AK blind vs BTN. At 25NL, whenever I got 4-bet and I 5-bet jammed, they never ever folded. They almost always showed me AA/KK/AK, and sometimes QQ. But at 50NL, they are a lot more aggressive, especially blind vs BTN and do fold to 5-bet jams and do 4-bet bluff.