Originally posted by Eladar
Did he not see the pawn push after he played Nc3?
Maybe he was drunk and forgot he was supposed to take the pawn first.
What was the purpose for a4?
2.Nc3 is a book line, albeit a sideline. It is trying to get Black to over-extend, as Black does to White in many other openings, such as the King's Indian or Alekhine's Defense. It's inferior, but hardly a fatal mistake.
The purpose for a4 was to stop me from playing ...b5 to support a P on c4, but yes, it was a mistake. I can only guess that he was preparing to undermine my Pb5/c4/d3 chain with b3/a4, but that's never going to work with such a cramped position. He had to play d3 there.