I did fold, but that shouldn't make commenting on the situation difficult...

Villain is an unknown. I checked the flop figuring a reasonable calling range for either villain on the flop has my TPWK beat, and i could extract value from a second pair hand if a Q or K hit the turn.

I figure villain's range on the river is probably 9-9/8-8/2-2/missed draw. I just haven't seen anyone use this line with a bricked draw at 200NL. It would be a great idea though, seeing how i have played my hand. Should the fact that a drawing hand that missed is in my range have encouraged me to call? I still think he would only c/c the river with any two pair (maybe not A-9).

Hero: ($200.75 in chips)
Villain: ($196 in chips)
4 other players

*** HOLE CARDS ***
Dealt to Hero: [As 6s]
Player 1: calls $2
2 folds
Hero: raises $6 to $8
Villain: calls $7
1 fold
Player 1: calls $6
*** FLOP *** [9s 2h Ad]
Villain: checks
Player 1: checks
Hero: checks
*** TURN *** [9s 2h Ad] [8h]
Villain: bets $16
1 fold
Hero: calls $16
*** RIVER *** [9s 2h Ad 8h] [6d]
Villain: checks
Hero: bets $52
Villain: raises $120 to $172 and is all-in
Hero: folds