I know it is normal to play the e5 or d5 or c5 or Nf6. All of which have the common intention of controlling the center.
What if Black gets a little creative and tries a6? With the idea being that you go to b5 the next move and then play Bb7. If white castles kingside, you could then play h5,g5 and start an attack. White could easily get over excited with dominance over the center and over extend his pawns producing weakness in his ranks.
My question is:How bad is 1..a6? Has it ever been played in modern chess by grandmasters?(By modern, I mean in the 21st century)?