Rules of the Game: The center mark of a field is indicated at the midpoint of the halfway line. A circle with a radius of 9.15 m (10 yds) is marked around it.
Rules of the Game: According to FIFA, goalposts and crossbars must always be painted white.
Goalkeeper is the only position to be explicitly part of the rules of the game since they were codified in the 19th century.
CONCACAF, the Confederation of North, Central American and Caribbean Association Footbal, was founded in 1961 and has 40 member associations.
Substitutions were allowed for the first time in the 1970 World Cup.