At this game I decided to play the Jaenisch gambit against a 2000ish player because that's what I normally play against the Ruy Lopez, and because even though it is a quite tactical opening I thought that on a more positional game I'd certainly get squashed so why not try my best.
After 14. .... Bg4! my evaluation was that I had the best position, and so I was getting the upper hand against a much stronger opposition; but at the end position I didn't like my chances that much. Anyway today I just found out that the guy mass resigned his games and so I got the win after all, but what matters most to me is that for some time I was better against a good player while playing black in a very tactical opening.
Evaluations from stronger players are welcomed!