to start and stop the action, and supervises the scoring of holds and infractions. The judge sits at the side of the mat, keeps score, and occasionally gives his approval when needed by the referee for various decisions. The mat chairman sits at the scoring table, keeps time, is responsible for declaring technical superiority, and supervises the work of the referee and judge. To call a fall, two of the three officials must agree (usually, the referee and either the judge or the mat chairman). Session format In Greco-Roman and freestyle, the format is two three-minute sessions. Before each match, each wrestler's name is called, and the wrestler takes his place at the corner of the mat assigned to his color. The referee then calls both of them to his side at the center of the mat, shakes hands with them, inspects their apparel, and checks for any perspiration, oily or greasy substances, and any other infractions. The two wrestlers then greet each other, shake hands, and the referee blows his whistle to start the session. A wrestler wins the match when he has outscored his opponent at the end of the two three-minute sessions. For example, if one competitor were to score four points in the first session and his opponent two, and then two in the second session, his opponent zero, the competitor would win. Only a fall, injury default, or disqualification terminates the match; all other modes of victory result only in session termination. In freestyle, if no wrestler scores in two minutes, the referee of the match will then identify the more passive wrestler, and that wrestler will be given a thirty-second window of opportunity to score, and if he doesn't, then his opponent will be awarded a point. When the session (or match) has concluded, the referee stands at the center of the mat facing the officials' table. Both wrestlers then approach each other, shake hands, and stand on either side of the referee to await the decision. The referee then proclaims the winner by raising the winner's hand. At the end of the match, each wrestler then shakes hands with the referee and returns to shake hands with his opponent's coach. Match scoring In freestyle wrestling, as well as in Greco-Roman wrestling, points are awarded mostly on the basis of explosive action and risk. For example, when one wrestler performs a grand amplitude throw