I'm playing a solid regular HU and get dealt Q9 off a few hands in. I don't have any good reads on the guy, he seems to play well and is capable of mixing it up. I raise it up to $30 from the SB, villain calls. Flop comes 9s-6d-6c. Villain checks, I bet $40, he min-raises to $80, I call. Turn comes a 5h. Villain checks, I bet $90 into a $240 pot, villain calls. River comes a Qh. Villain checks, I bet $150 into a $420 pot. Villain check raises me AI for $550 more. Call or fold, and why? What do you think villain's most likely holdings are? What do you think of how I played the hand PF/flop/turn? Against a tighter player I may have taken a bet(call CR)-check-bet line instead of the trifecta (betting all 3 streets). I also merits to 3-betting the flop against an aggressive player.