Mixed curling the house. In the 2015-16 season, a new rule called "power play" was added, which each team can exercise in one end per game, only when they have the hammer. Instead of positioning the rock in the house on the center line, it is placed to a position straddling the edge of the eight-foot circle, with the back edge of the stone touching the tee line. The opponent's guard stone is placed in line with the stone in the house and the hack. The power play cannot be used in an extra end. Mixed curling Mixed curling, also known as
Arena curling is overcomable with some effort however, as evidenced by the fact that many curling clubs in Scotland (the home of curling) operate on arena ice. A second major challenge of arena curling is rock storage. Arena clubs must develop a system for storing the 42 lb rocks off ice, while scrupulously protecting the bottom running surface. In large arena clubs of 4 or more sheets, it can take considerable man-power to move rocks on and off the ice before and after each game. A related challenge of off-ice rock storage is rock temperature. To curl effectively, rocks must be maintained