AQ

[crockett]

UTG+2 is unknown.
Standard?

Party Poker 1/2 Hold'em (10 handed) converter

Preflop: Hero is BB with Q[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img]. MP2 posts a blind of $1.5.
UTG folds, UTG+1 folds, UTG+2 calls, MP1 folds, MP2 (poster) checks, MP3 calls, CO folds, Button folds, SB completes, <font color="#CC3333">Hero raises</font>, UTG+2 calls, MP2 calls, MP3 folds, SB calls.

Flop: (9.50 SB) 5[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, UTG+2 calls, MP2 calls, SB calls.

Turn: (6.75 BB) Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">UTG+2 raises</font>, MP2 folds, SB folds, Hero.....

[TwoShedsJackson]

Clearly you need to worry about KJ but a weaker Q being played aggressively is likely - absent a read I'd call his raise and check/call a blank on the river.

I wonder is it better to treat unknowns as incompetent or competent players?

[Bez]

I'd be tempted to re-raise given that your opponent may have QJ or KQ, but I think this would be too costly when your opponent had the straight, especially since those hands you're ahead of have a redraw. Call down.