I was asked by a new player what an opening of 2D meant. I wrongly stated that it was not an ACOL bid and anyone opening 2D had invented their own convention. I was wrong to say that firstly because I know from experience and past reading that someone, at some point, will have invented a convention for any opening bid possible. Bye the by, I came home, dusted off the book and read Benjamin 2C and 2D openings and also the multicoloured 2D opening. Two questions follow:
1. I have never come across anyone playing Benjamin or multicoloured 2D if anyone does play these conventions please tell me why?
2. How do we define ACOL? If you can have multiple subsystems and multiple conventions outside the standard conventions does there come a point where you can no longer claim to playing ACOL?