A guide to playing Gm's for Patzers:
1) You are surely gonna lose, be prepared for that.
2) If by some fluke you don't lose, it will NOT be because you outplayed him, it will be because he made a mistake.
3) He is unlikely to make a mistake in a line he is familiar with, and where he understands the idea behind the line far better than you do.
4) He is unlikely to make a mistake in a simple position.
5) Your only hope is to complicate and unbalance as much as you can, and HOPE he errs before you do. The most likely type of mistake is probably where he goes into a forced line and miscalculates the position at the end of it.
6, oh, and did I mention, you are surely gonna lose :(
So, I agree with Gonnosuke (I think)
It is amazing how infrequently GM's play e4 these days. It wasn't played in the
World Championship match and d4 is the standard opening move in the U.S.
Championships as well.