Tough play preflop. If you raise, you gotta raise more with so many limpers. With so many limpers I might just see the flop for free.

I don't cbet the (relatively ugly) flop, especially 4-handed.

And I must be listening to Fnord more because I agree about the opp play. He made a pretty common mistake PF (and one I'm sure we've all made before), but his calls after that are not totally beyond reason. Someone here has a great sig about arrogance (or underestimating opponents) being a cardinal sin in poker.

It doesn't seem like the opp was a strong player, but let's check the math...
I think we all agree the PF call was bad. But it was done. The flop for the opp isn't bad.

FLOP:

Oesd; 8 outs/47 cards = 17% chance of winning
this discounts the fact that the 3 and 6 are both live but this is not an unreasonable assumption.

Call: $9 to win $30 = 30% pot contribution. This is a bad call on pot odds but could be justified by implied odds. In fact, the poster's turn bet confirms those implied odds.

TURN:
OESD (8 outs), plus trip 3s (2 outs), plus two pair (3 more outs). I count 13 outs.

13 outs/46 cards = 28% chance to draw out.

Call: $12 to win $44 pot= 27% pot contribution. Fully justified for pot odds.

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Now if only I could do that during a hand...