Simple River Decision

[Moozh]

Let's see, CO has been playing fairly tight and his preflop cold-call is a bit strange. Button is a bit wacky. He seems to like to limp-reraise with medium hands and can be a bit overaggressive postflop. Button is semi-tilting, normally a solid player but has gone quite a few extra bets on certain hands where it has been obvious he's beaten.

Bet or check-raise?

Party Poker 3/6 Hold'em (6 max, 6 handed) converter

Preflop: Hero is UTG with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, CO calls, Button calls, <font color="#666666">1 fold</font>, BB calls.

Flop: (8.33 SB) 2[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, Hero checks, CO checks, Button checks.

Turn: (4.16 BB) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, Hero checks, <font color="#CC3333">CO bets</font>, Button calls, BB calls, Hero calls.

River: (8.16 BB) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, Hero...