Just in case anyone is curious ECC traffic break down: 11% from: California 10% from: Canada 7% from: New York 6% from each of: UK, Florida 5% from each of: New Jersey, Illinois 4% from: Michigan 3% from each of: Australia, Ohio, Washington, Pennsylvania 2% from each of: Virginia, Oregon, Minnesota, North Carolina. Wisconsin, Tennessee, Massachusetts, Arizona, Maryland, Indiana 1% from each of: Netherlands, Colorado, Nevada, Missouri, Georgia, South Carolina, Kansas, Kentucky, Connecticut.
It's where you play with four people in total. Two from each team. Hence the double player. Single elimination is just when you lose a game, you get eliminated from the rest of the competition.