 Baseball
is a bat-and-ball sport played between two teams of nine players
each. The goal of baseball is to score runs by hitting a thrown
ball with a bat and touching a series of four markers called bases
arranged at the corners of a ninety-foot square, or diamond. Players
on one team (the offense) take turns hitting while the other team
(the defense) tries to stop them from scoring runs by getting
hitters out in any of several ways. A player on offense can stop
at any of the bases and hope to score on a teammate's hit. The
teams switch between offense and defense whenever the team on
defense gets three outs. One turn on offense for each team constitutes
an inning; nine innings make up a professional game. The team
with the most runs at the end of the game wins.
Any baseball game involves one or more umpires,
who make rulings on the outcome of each play. At a minimum, one
umpire will stand behind the catcher, to have a good view of the
strike zone, and call each pitch a ball or a strike. Additional
umpires may be stationed near the bases, thus making it easier
to see plays in the field. In Major League Baseball, four umpires
are used for each game, one near each base. In the all-star game
and playoffs, six umpires are used: one at each base and two in
the outfield along either foul line.
Baseball is played at a number of levels, by
amateur and professionals, and by the young and the old. Youth
programs use modified versions of adult and professional baseball
rules, which may include a smaller field, easier pitching (from
a coach, a tee, or a machine), less contact, base running restrictions,
limitations on innings a pitcher can throw, liberal balk rules,
and run limitations, among others. Since rules vary from location-to-location
and among the organizations, coverage of the nuances in those
rules is beyond this article.
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