  In this definition, Suits narrows the scope of the concept of ‘game’ and distinguishes between two types of sports: ‘refereed games’ and ‘judged performances.’ That is to say, whereas in his earlier definition all sports are games, in his revised definition only some sports are games, other sports are performances. Soccer, basketball, tennis, and American football are games, while gymnastics, figure skating, and diving are performances. The key difference between the two, according to Suits, is that games have constitutive rules, whereas performances lack constitutive rules and have only rules of skill. Thus, for Suits, games consist in overcoming obstacles erected by the constitutive rules, whereas performances centre on the approximation of an ideal or perfect performance. For example, soccer players play the ball with their feet cooperatively as a team to put the ball into the opponent’s net. Using the feet, working as a team, and facing an opponent are the obstacles erected by the rules of soccer. For Suits, there is nothing like these in performances. Figure skaters do not attempt to overcome obstacles. Rather, they try to approach an ideal performance that manifests virtues such as power, grace, and imagination. 