Thanks guys. I actually went for the c/r because of something I read in NLHE T&P (p. 151) about one of the best situations for river c/r being a flush completing and you have the nuts. (Or second nuts in this case, thx Khabbi ). I figured one of the two opps made a lower flush and would bet, and if the Ks was out, they'd probably call a c/r.

In hindsight, this would have been better off with a read, and it's possible that CO would have raised if I lead...

River: J ($20, 3 players)
Hero checks, MP1 checks, CO bets $10, Hero raises to $50, MP1 folds, CO calls.

Results:
Final pot: $120
Hero showed As 9h
CO mucks Tc Ks


Is thinking I should have raised even more just plain greedy?