Hand vs Stoxtrader

[PokerBob]

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6 handed game.

Solid LAG/TAG opens in the CO (which can be hands like T9o, A7o, etc), I 3 bet from the button with 66. Stoxtrader in the SB has a long delay (not normal for him though it can occasionally happen just coincidentally) and then caps. Stox is very aware of both me and CO. CO folds. I call.

Flop Tc9d5c. Stox bets, I call. I have 6c in my hand.

I'm silently hoping for a red king to come on the turn so I can just fold.

Turn 9s. Stox checks, I check. Ok.

River 7h. Stox bets. I wanna fold, but call.

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IMO there is soooo much metagame and posturing going on in this hand that the right move is likely impossible to decipher from merely reading the HH, but i'll take a stab. IMO STox's range is not very large here, as he is OOP vs. 2 decent players. the flop seems standard. when he checks the turn, I feel like he is either setting you up for a c/r with a big pair, or he has AK-AJ and doesn't want you popping him with a hand that he has a fair number of outs against. IMO his river bet means his hand is very weak or very strong. i think he either has AA/KK and really wants a call or he has AQ-AJs and hopes you'll fold as he cannot win the pot any other way. IMO if he has AK he check/calls the river.