2/4 K3s in SB, flushdraw, 2nd pair on river.
 

No read.

Party Poker 2/4 Hold'em (8 handed) FTR converter on zerodivide.cx

Preflop: Hero is SB with K[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, MP2 calls, CO calls, Button calls, Hero completes, BB checks.

Flop: (5 SB) 4[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">Hero bets</font>, BB folds, MP2 folds, <font color="#CC3333">CO raises</font>, Button folds, Hero calls.

Turn: (4.50 BB) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets</font>, Hero calls.

River: (6.50 BB) K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets</font>, Hero?

Call or fold?

Re: K3s in SB, flushdraw, 2nd pair on river.
 

I don't see any reason to do anything else but call.

Re: K3s in SB, flushdraw, 2nd pair on river.
 

Call, the way the hand was played, it's highly likely your opponent just has a pair of 9s.

Re: 2/4 K3s in SB, flushdraw, 2nd pair on river.
 

Anyone like betting the river? If he has a 9, he might check behind, and I don't think he'll raise with a worse hand.

Re: 2/4 K3s in SB, flushdraw, 2nd pair on river.
 

Not having a read is pretty annoying, however, I think check-raising turn is good against an agressive player. The Ace prob scared CO and if he calls u have outs. Check-calling is weak in my opinion there. The way u played i'd bet/fold river.