My best game! until the next one..

A game for the Club Championship, against a 120+ rated oponent.
After a normal opening (rather clumsy on the black side) an underdeveloped oponent wasted valuable tempi by manouvering his queen and tempted his luck by castling long.

I think it represents my best game so far, look out for the cool knight sacrifice (19.Nb5) that can not be refuted! I also think that the timing of the sacrifice is quite unique, less chances of being effective if played sooner or later than the given moment.