Betting 200 and folding for 170 is pretty bad. He called a raise OOP and led two streets into the preflop raiser on a pretty coordinated board. Any hand that didnt already have the villians "dead" hands smoked on the flop got there on the turn or river so his opponent would have to be brain dead to pay off with these. Even with your image If your betting this river your only getting a call when your beat. I think I check call here. This is the perfect bluffing card since it is very unlikey you fire two barrels with a draw and check when you make your hand. I also think a flush draw would have been raised earlier by your opponent. The little bit of 3/6 that I played on pokerstars was so aggressive that I think your going to get pushed on a lot here when you check whether your opponent has the goods or not and I just don't see a lot of hands an average 3/6 stars player would play like this that beat you.