This is a discussion on $50 NLHE 6-max: $ : Do I fold 2nd pair facing a river 4x raise? within the online poker forums, in the Cash Game Hand Analysis section; .3/.6 NLH 6 Max
UTG (Hero $69.22) raises with KsQd
BTN (Villain $56.08) calls
Both Blinds Fold
Flop 5s Kc As Pot= $4.50
Hero checks, villain checks back
Turn Tc Pot
Call. You took a line including your sizing, which capped your range, but his range is also capped, because he checked back the flop and he just called the turn. So while you rarely have trips or better, neither does he, which mean, he is most likely bluffing. Sure from time to time you will run into trips with a bad kicker or a slowplayed monster. But you are calling 9$ to win a pot of 32.4$, and he is almost certainly bluffing more than 30% of the time in this situation.