[Luzion]

I think how everyone does it is pretty much the standard; which is including any reads you have on your opponent. Its sort of ridiculous to assume your opponent could be holding all possible suited heart combinations. Put your opponent on a range of hands that he could possibly have. You cant really assume your opponent could always be holding hands like T3s or 82s can you?

You use logical guesswork to eliminate some possibilities. You can then sum up all the possibilities by using C(N,r) or just manually counting. Then you can simply figure out the hands that beat you and divide by the range that he could possibly have.