Official soccer rules or "Laws of the Game"are far from simple. There are 17 laws that are revised annually by the Federation Internationale de Football Association (FIFA), the international soccer governing body.
Rule Adjustments
These official soccer laws are designed to apply to all levels of soccer, but certain modifications for groups such as youth organizations and recreational leagues are made to make the game more fun, to promote fair play and to help players learn the sport. Typical modifications include field size, ball size, length of game, number of players per team and the number and frequency of substitutions.
The Basics Even though specific modifications are made for some organizations, basic soccer rules apply to everyone. Here is an overview of the basic rules of the game:
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Organized Youth Soccer
The United States Youth Soccer Association (USYSA) issues its own official modified FIFA soccer rules for players under 12. Many youth organizations use these modified rules as guidelines for their leagues.
Online Version
If you need a copy of the official rules, FIFA has made an online version available that you can download called "Laws of the Game." For specific questions, another wonderful free reference on the FIFA website is the "Questions and Answers to the Laws of the Game."