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Unsourced material may be challenged and removed. The rules of baseball differ slightly from league to league, but in general share the same basic game play. There are several major rules, which differ only slightly. The “Official Baseball Rules” govern all professional play in the United States and Canada, including the World Baseball Classic.
The complete rules are published as the Official Baseball Rules at MLB. Major League Baseball in the United States and Canada. The rules are also published in book form in North America by the Sporting News. Many amateur and youth leagues use the “OBR” with only a few modifications for safety.
Little League, PONY League, and Cal Ripken League. For origins of the game, see Rounders, a game originating in England and Ireland. Unlike many other sports, the Official Baseball Rules have remained largely static during the modern era of the game.
Many baseball players, fans, and administrators view the rules and traditions of professional baseball as time-tested and nearly sacrosanct. This was not the case during baseball’s early days, particularly in the late 19th century, when rules changed almost yearly, often significantly.