Which of the following descriptions about Judo is INCORRECT?

Judo is a sport for two players. The sport is governed by strict rules of politeness. Before and after a match the players must bow to each other. A match is won on points or superior play. (18)A player wins a point when he holds his opponent on his back so that he is unable to move for thirty seconds; when he forces his opponent to give up by using strangleholds or armlocks; and when he makes a clean throw. A player wins a half point when he holds his opponent down for only twenty-five seconds. Kicking, hitting, and gouging are not allowed. A referee watches the players and decides who wins each point. The player who wins the necessary amount of points first wins the match. (19) A contest or match may last up to twenty minutes.
    Judo requires much physical training and instruction. Training takes place in a dojo, or gym area. In the Orient, players practice on straw mats. In Western countries a canvas wrestling mat can be used. The players wear cotton jackets and trousers circled by colored belts. (20) A beginner wears a white belt and a more accomplished player a brown belt. Experts wear a black belt.