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
College Curling USA College Curling USA College Curling USA is the governing body of collegiate Curling in the USA. The organization acts as the NCAA does in other college sports — setting game play, eligibility, and organizational rules. College Curling USA is affiliated with United States Curling Association (USCA), the organization responsible for organizing Olympic teams. The idea of college curling in the USA began in the late 1980s when the Illinois State Curling Foundation (ISCF) began to look into college curling, filling a gap between junior and adult curling levels. The ISCF, along with curling clubs, began promoting the idea of curling