Good players in the multiplayer lobby, of which I am one, usually say "No Walls" at the start of the game.  It's a common convention that most players agree on and often mutually assume even when it isn't said, due to how imbalanced walls are.  As a result, instead of whatever the intended game use of walls is, walls are virtually never used competitively.  The exception to this would be the Iberian starting walls, which are considered OK, but even the Iberian player is expected not to rebuild h