The Pirc against the London system
In this game my opponent was the hungarian international master Emil Szalanczy. He is famous about his attacking style, played a lot of nice dragon games.
I played the London sytem with Nc3 and he continued to develop his kingside, so I decided to play e4 and go to the Pirc defense.
I remembered our games in the Dragon sicilian, how strong was his g7 bishop. So I decided to exchange it early. Too early, because it allowed him to play c5 and equalize.
We exchanged all the minor pieces and because of my pawn advance on the kingside I needed to play pracise to go to an equal pawn endgame: