Opponent is a tighter regular - opens UTG 10% - but my hand is strong enough to 3bet anyway. Sure we could make an argument for flatting, but I think 3betting is fine.

On the flop I could go either way -
1.) checking because my hand is not gonna have 3 streets of value anyway and I have decent outs plus Qs blocker.
2.) Betting with merged range because nobody really should have that much 3xxx in their ranges and I should have range advantage because of overpairs and stuff.

I decided to bet and face a checkraise - my opponent has a checkraise about 13% and he is quite aggressive postflop - I think calling the flop checkraise after I bet is fairly standard - I can hit or he can be bluffing.

On the turn he goes with a pretty big sizing, I think his range should be polarized between JJ, 3xxx and airs ( fd or complete airballs ). I decided to call and make a decision on the river - I can still improve to a fullhouse with decent implied odds.

On the river I wasnt sure whether I want to use this hand as a bluffcatcher - blocking A3xx so heavily, but having no J is really really bad + blocking his fd with Qs, although I dont have As which might be an important factor. But then I decided to fold because I think I can defend with hands like AA3x and not be overfolding? Or fullhouses like JJ that I 3bet vs UTG open.