Should I be more aggressive and 3-bet the flop? Should I be more prudent (weak) and just call the turn? Is it just plain bad luck if he has A9, an overpair, or a set? There's a line in SSHE that say something like "getting raised on a very uncoordinated or very coordinated flop is worse than getting raised on a semi-coordinated flop." If I understand correctly, it's bad on a coordinated flop because you could be up against a big draw or made hand (duh). It's bad on an uncoordinated flop because the raiser probably has a set or overpair. And it's good on a semi-coordinated flop because the raiser could very well be on a draw. Well, this flop is pretty uncoordinated, so does all of that change anything?

Party Poker 0.50/1 Hold'em (8 handed) FTR converter on zerodivide.cx

Preflop: Hero is BB with K[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls, MP1 calls, MP2 calls, CO calls, Button calls, SB completes, Hero checks.

Flop: (7 SB) 3[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(7 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, UTG+1 calls, <font color="#CC3333">MP1 raises</font>, MP2 folds, CO calls, Button calls, SB folds, Hero calls, UTG+1 calls.

Turn: (8.50 BB) 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
Hero checks, UTG+1 checks, MP1 checks, CO checks, <font color="#CC3333">Button bets</font>, <font color="#CC3333">Hero raises</font>, UTG+1 folds, MP1 folds, CO calls, Button calls.

River: (14.50 BB) T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, CO checks, <font color="#CC3333">Button bets</font>, Hero calls, CO calls.

Final Pot: 17.50 BB