100% Accuracy against King's Gambit

Never played King's Gambit myself, since I don't know any lines properly from that opening. But I just remember that i should decline the offer by playing 1. e4 e5 2. f4 d5 Falkbeer countergambit. It's kind of like Queen's gambit, and i should avoid complications by declining it.

I had to do something when I faced it today and I played my only move in my knowledge, rest was up to me. But either opponent played it poorly or I found a good way to respond, i don't know, probably the first. Since It's not a refuted gambit, maybe one line, but not all of it. Anyways.

And I was surprised that I played with 100% accuracy in this, did i find the best responses intuitively? 

lol yeah, thatwas unexpected