20-40

I open red QJ in middle position and get 3 bet by the button. The button is a weird dude. He limps plenty, raises plenty, cold calls plenty, and three bets plenty preflop. He does not fold plenty. Post flop, he tends to call with any part of the board and then fold the river without something decent, but he also misses an ass ton of value. I mean he is super MUBSY. I call.

Flop is 886 two diamonds. I check/call.

Turn is black T and I c/r.

Don't expect mubsy guy to bet bet thin enough to find many folds. And sometimes he has aces, too.

What does he think of you....

or, how have you been playing this session?

I like it if you've been showing down winners and playing TIGHT.

Everyone thinks I'm a nit, but he just sat down and we've only played together once before.

Your action suggests a pocket pair or part of the board. But the two close diamonds put flush and maybe straight draws in your range too, so he might call you down with an ace high hand. If he calls, what do you do on the river if, a diamond comes, you pair, or you miss totally? Since you think he's mubsy, then I assume you plan on betting most river cards. If so, then you're committing two bets with that check-raise if he calls. I wouldn't mind doing that because even if it's wrong and you're caught, it will create action for you on future hands when you have the goods (but make it harder to bluff successfully too). Generally, I like to be aggressive against timid opponents.

i just fold

dude is still likely to call you down with the very bottom of his range, so it seems like a massive spew to me.

Don't like it. The pot is 5 BB when the action is back to you and you are committing 3 BB to winning it. That's an expensive bluff and it doesn't work nearly often enough to justify it.

Against someone who won't fold A high it might be best to call turn and donk some rivers. Cheaper bluff to try to fold out K high or whatever might fold.

I think it's fine

Near the bottom of ur range

Opportunities exist to take advantage of "mubsy" players. Especially when they have a wide range.Much depends on whether this villain is Mubsy before or after the fact.

If he is the type to look at this turn and fear you have trips or a straight and check back a hand like JJ's then I do not like a CR. His betting range will be much too strong and much too thin too attack. I'm going to extrapolate that if this turn scares him, he is going to also give up on bluffs.

If he is the type to bet the turn and then respond with Mubsyness, now we might be talking. you probably don't need to fear getting 3 bet often against this player type.

I think calling this turn and donking improvement would be my default absent the specific info I'm looking for to make a play.

I guess my point is that if I peel this flop, don't there have to be cards that I continue on that aren't a q or j?

Given the size of the pot due to the 3b pre and the perceived wide range of the villian you are getting a good price just to peel for just a Q or J. That being said, there are plenty of cards that can hit the turn and allow you to continue...9,T, any diamond.

Whether you decide to escalate things will be dependent on specific reads.

This is actually the opposite and if an opponent is checking back a hand as strong as JJ, it means that their betting range on this turn card will be "bluff" heavy (depending on what they deem is a "bluff" in this range).

To extrapolate further, if he's afraid of betting JJ on the turn for fear that you've trips or a set, why bet AA? If he's not betting AA, then what is he betting?

I'm not using this as a justification for xr on the turn, but it is important to think about what removing value hands actually does to someone's range.

My point is that if you are considering making a play, you should have a solid read on your opponents tendencies. There are different flavors of "Mubsy". Some players might be more polarized on this turn as you suggest. Some players may just shut down completely as I alluded to. Some players might rationalize that they have waited all day to get AA so they are gonna bet the whole way but decide to not bet JJ's. It all depends on how they perceive their hand in relation to the board. Sometimes their thinking doesn't make sense.