Fold Equity.... What is it?

Originally Posted by Renton

the % chance that opponent will fold a better hand than yours to your bet.

ex. You have 67 and bet in LP preflop, BB calls. Flop is 389 rainbow. BB bets, and you raise. You technically have the worst hand if he has T9, with only a 32% chance of winning. But since you are representing a hand better than T9, the villain will fold to your raise. Fold equity is the percent chance that he will do so. In this case you probably need him to fold around 40% or so of the time for it to be a profitable semibluff.

Even if he doesn't fold though, its a good play because he will probably let you see a free river card.

So it looks like my example isn't exactly correct. With your above example, how do you apply playing styles to fold equity? Does the % chance he folds go up for a tight player and down for someone looser? If so, is there any logic in determining that or is it more of an art?