I suck, but I've been practicing on the chess.com app. Anyone else use it?
I play some. My son is really good.
Not a strategy expert, but I believe the defense you are talking about, OPK, is actually called Caro-Kann. (Then again, it is deFense, not DeNense, so it was probably a typo, an autocorrect, or a dictated post.)
I play, and am pretty good. It's been a while since I played, but I once beat a fella named Aubrey Baker, who won some kind of chess state title in SC. If I have a problem, it's that I am kind of impatient..lol Not a good thing in this game.