The rules defined by the MLB are applicable to professional teams of the American League of Professional Baseball Clubs, the National League of Professional Baseball Clubs, as well as the leagues which are members of the National Association of Professional Baseball Leagues. The MLB allows certain modifications to requirements in the case of amateur groups playing the game. The official rules have changed almost every single year since 1845.
The official MLB site details these rules in full. The various objectives of the game are first outlined as well as the layout of the playing field. In this section instructions are given regarding the marking of the three bases and home base, specifications of the bats and the ball to be used, the type of mitts to be worn by each player requiring one, uniforms of the team, helmets and other equipment.
Various terms used in the game such as “appeal” and “fly ball” are defined in the next section. Manner of conducting game preliminaries and starting and ending the game are also explained in a separate section. The duties of the umpire can also be found in the official rules of the game. Definitions and expectations from a batter, runner, pitcher and the official scorer are also explained in length. The official scorer has an important role to play, particularly in the event of any dispute and is responsible for compiling an exhaustive report of the whole game. The report needs to touch upon matters such as runs batted in, base hit errors and the like.
Pointers are also provided to avoid any confusion or wrong calls on the part of the umpire during the course of the game. Directions are provided outlining situations when a player may be penalized and also on legal appeals. The rules have provisions to ensure alternate arrangements when a game is disrupted due to any reason including weather and human interference.
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Baseball History And Rules - A short history and the basic rules of baseball.