Local rules
How long is each half of a school field hockey game?
Field hockey
There are sometimes minor variations in rules from competition to competition; for instance, the duration of matches is often varied for junior competitions or for carnivals. Different national associations also have slightly differing rules on player equipment. The new Euro Hockey League has made major alterations to the rules to aid television viewers, such as splitting the game into four quarters, and to try to improve player behaviour, such as a two-minute suspension for green cards—the latter was also used in the 2010 World Cup. In the United States, the NCAA has its own rules for inter-collegiate competitions; high school associations similarly play to different rules, usually using the rules published by the National Federation of State High School Associations (NFHS). This article assumes FIH rules unless otherwise stated. USA Field Hockey produces an annual summary of the differences. In the United States, the games at the junior high level consist of two 25-minute halves, while the high school level consists of two 30-minute halves. Many private American schools play 25-minute halves, and some have adopted FIH rules rather than NFHS rules. Players are required to wear mouth guards and shin guards in order to play the game. Also, there is a newer rule requiring certain types of sticks be used. In recent years, the NFHS rules have moved closer to FIH, but in 2011 a new rule requiring protective eyewear was introduced for the 2011 Fall season. The 'cage style' goggles favored by US high school lacrosse and permitted in high school field hockey is not permitted under FIH rules.