NL50: Large Pot w/ OverPair OOP at the River

[oakrdrzfan]

Villain is unknown. Just sat down at the table. What is the right line to take on the river here. A straight just got there, is he slow playing a set? Push, C/C, B/F?

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 9 Players
LeggoPoker.com - Hand History Converter

MP1: $44.75
MP2: $70.60
CO: $52.45
BTN: $48.50
SB: $21.60
Hero (BB): $52.30
UTG: $60.40
UTG+1: $30.80
UTG+2: $49.75

Pre-Flop: K[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/spade.gif[/img] dealt to Hero (BB)
UTG calls $0.50, UTG+1 calls $0.50, 3 folds, CO calls $0.50, 2 folds, <font color="red">Hero raises to $4</font>, UTG calls $3.50, 2 folds

Flop: ($9.25) Q[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $7</font>, UTG calls $7

Turn: ($23.25) 6[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $15</font>, UTG calls $15

River: ($53.25) 8[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero ???