Those hard/crunchy edges? I've done that, too, in over-baking them. And that's what chewy is like for me...not as hard and crunchy and dry as those edges, but yes, almost like that. I like some fudgy denseness without having to put a lot into the chewing of it, and with more creaminess (a higher moisture content) I guess.

But how I define chewy (sort of a one-off from those hard edges, only more throughout the brownie) could be a total 360 from how someone else defines "fudgy", because to them (and to you) they're the same thing.

Interesting food for thought!