Korea and a "left-side" style favored in the Gyeongsang and Chuncheong provinces. The difference depends on the way the satba is fastened. In 1994, the Korean Ssireum Federation proposed the unification of ssireum into a single left-sided style as the official style to be used by all competitors. Cultural heritage status Following an unprecedented joint application by both South and North Korea, Ssireum was inscribed in the UNESCO Intangible Cultural Heritage Lists. It is also enlisted as the 131st Intangible Cultural Property. Method of competition Ssireum is conducted within a circular ring, measuring approximately 7 meters in diameter, which is covered with mounded sand. The two contestants begin the match by kneeling on the sand in a grappling position (baro japki), each grabbing a belt—known as a satba (샅바)—which is wrapped around his opponent's waist and thigh. The wrestlers then rise while retaining their hold on the other's 'satba.' The match is awarded to the wrestler who forces the other contestant to touch the ground with any part of his body at knee level or higher. Unlike sumo, pushing your opponent outside of the ring does not warrant a win, just a restart. Normally, professional ssireum is contested in a best-out-of-three style match. There are 3 judges, a chief referee and three sub referees. The chief judge is positioned inside the ring, whereas the sub referees are located on the outside of the ring, one to the right and others to the left. If an unfair judgment is called or the chief referee is unable to render a decision, the sub referees can request a revocation of the decision or a rematch. In addition, they can recommend the cessation of the match when an injury occurs. The referees' decisions throughout the competition are absolute and held in the highest regard, meaning that athletes cannot challenge any judgments declared during the match. Today there are also women Ssireum wrestlers. Women wrestle only among themselves but follow the same rules (except that men are topless whereas women wear tops). There are 4 weight classes in professional wrestling: flyweight (Taebaek, 75 kg), lightweight (Geumgang, 90 kg), middleweight (Halla, 105 kg), and heavyweight (Baekdu, under 160 kg), named after the four famous peaks in Korea. Traditionally Ssireum was contested with the top portion of the trousers rolled down to provide grip. The use of "satba" was invented with the birth of professional Ssireum in