Originating in medieval Scotland, the sport of curling involves two teams of four players each, as they try to slide large polished stones along a playing field of ice toward four concentric circles. Easy, right? Wrong. In fact, curling is known as “chess on ice” due to its intense strategy and delicate maneuvering and sweeping 40-pound pieces of granite around. Hey, it’s no cornhole tourney, but what is? The 2016 USA Curling National Championship features the nation’s Top 10 men’s and Top 10 women’s curling teams.