My last (amazing) game with erik

The games I play against erik are always at least great. This one I enjoyed very much. Althouhg I learned that sometimes (or always) the control of the center is more valuable than the right to castle, I really don't find the real losing move in the opening. Perhaps the mistake is in the early middle game.

Either way, I would like to get anybody's advice (including erik's) to this game in which I exchange a bishop for a knight in avoiding the "fork trick" early in the game. This opening led to a game in which I was constantly defending against a strong white attack, which finally I failed to whithold. The center of the board was never mine, perhaps this is the key issue.

Ups... I had a nice raking before this one...