Julius187 said:

(7700)
Action folds to Villain on the button who opens to 8000, small blind folds and Hero 3bets to 21000, Villain calls.

Flop (46700) 763
Hero bets 15500, Villain calls

Turn (77000) T
Hero bets 26000, Villain calls

River (129700) 4
Hero checks, Villain bets 36100

I would like to first know what do Hero and Villains ranges look like before giving my actual holding and my options facing the river decision. Thoughts appreciated and looking forward to the discussion.

Wow this is pretty interesting. Given the overall aggressive dynamic, this is a tough one. Seems like tons of leveling involved.

Preflop: ranges are pretty wide. Aggressive players don't like raise/folding button vs bb, so I don't think villain's range is very well defined yet. I think he's going to flat your 3bet with most of his already very wide opening range.

Flop: Villain is getting about 4-1, so I think villain's range remains fairly wide when he calls, although I think we can discount flopped monsters (76 and probably sets) because he doesn't raise. IMO he can still have overcards that he intends on turning into a bluff later, but he can also still have lots of one-pair hands that he hooded your 3bet with (some of which have straight draws). I think hero is still pretty wide also, since he'll more than likely be continuing with all his bluffs (although his bluffing frequency is debatable due to the fact that he shouldn't expect a lot of folds pre).

Turn: Hero's sizing is pretty small, but still I suppose it's fairly standard in a 3bet pot. It seems to me that there's a leveling game on this turn, revolving around the fact that villain knows you don't expect him to fold this turn card, but that you're giving him a good price anyway. I still don't think his range changes very much here, although now we can be fairly certain he doesn't have a monster (like a slowplayed set or flopped straight). I suppose hero can still have overpairs, but I'm not sure how often he's double barreling with his bluffs. He should definitely be firing again with his value hands, though.

River: Hero should probably be checking most of his range here, since this looks like a runout that clearly favors villain. A few of his marginal hands are now monsters now that any 5x is a straight. Villain's bet size screams value. His range depends a lot upon how wide you think he's hooding you preflop. Can he have 74 suited, 64 suited, etc? Was he priced out of peeling flop and turn with those hands? I don't think it's unreasonable to think he gets to the river with those hands, given the pot odds he was offered, assuming he's peeling wide in position against your 3bet pre. I think check jamming would be suicidal because it's pretty hard for hero to be holding a 5, unless it's A5hh, and also because on this type of board, villain isn't going to expect you to check a straight. River checkraises on 4-straight boards are very often bluffs IMO. If you have the straight, you're not going to check and risk missing value, because 4-straight boards get checked behind so often.

Interesting hand. Looking forward to further discussion. Hopefully the fact that I typed all this out while 8 tabling didn't cause me to miss something important.