London System | Very Aggressive Horwitz Defense

Wow, this was an odd game. Let me know in the comments if you recognize the setup that Black played. Does it have a name? Chess.com calls it the "Horwitz Defense" but that's just the first move. My opponent blitzed out his moves until he castled and got a pretty strong position, so I'm guessing it's a setup he uses against the London regularly.

There's one good puzzle that came out of this game. On move 9 I decide to counterattack instead of moving my own piece. It's crazy how often this leads to a blunder in chess -- it happened to my opponent later in the game as well! Anyway, see if you can figure out the problem with my plan. My opponent misses it, but it's findable. So put on your calculation hats and join me in trying to decipher this bizarre and very aggressive opening.

I hope you enjoy, and I'll see you next time.