interpretation of one sentence

[vil]

Dear teachers,

Would you be kind enough to give me your considered opinion concerning the interpretation of the sentence below?

You have the advantage of me.

= You know more than I do.

V.

[Pokemon]

Yes, you know something that I don't.

[Barb_D]

The only time I have ever actually read or heard this used, however, is in a novel or movie when one character is saying "you seem to know me/my name, but I don't know you/your name."

It wouldn't be used, from what I have seen, to mean "You know the capital of Nepal and I don't" or "You know what time the train from Liverpool arrives and I don't."

I've never heard this used in real life.