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Softball is a game similar to baseball played with a larger ball on a field that has base lengths of 60 feet, a pitcher's mound that ranges from 35–43 feet away from home plate, and a home run fence that is 220–300 feet away from home plate, depending on the type of softball being played. It was invented in 1887 in Chicago, Illinois, United States as an indoor game. The game moves at a faster pace than traditional baseball due to the field being smaller and the bases and the fielders being closer to home plate. There is less time for the base runner to get to first while the opponent fields the ball; yet, the fielder has less time to field the ball while the opponent is running down to first base.

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Catcher is a position for a baseball or softball player. When a batter takes their turn to hit, the catcher crouches behind home plate, in front of the (home) umpire, and receives the ball from the pitcher. In addition to this primary duty, the catcher is also called upon to master many other skills in order to field the position well. The role of the catcher is similar to that of the wicket-keeper in cricket, but in cricket, wicketkeepers are increasingly known for their batting abilities.

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A center fielder, abbreviated CF, is the outfielder in baseball who plays defense in center field – the baseball and softball fielding position between left field and right field. In the numbering system used to record defensive plays, the center fielder is assigned the number 8.

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Fastpitch softball, also known as fastpitch or fastball, is a form of softball played by both women and men. While the teams are most often segregated by sex, coed fast-pitch leagues also exist. The International Softball Federation (ISF) is the international governing body of softball. The ISF recognizes three pitching styles: medium pitch, "modified" fast pitch, and slow pitch. Fast pitch is considered the most competitive form of softball. It is the form of softball that was played at the Olympic Games in 1996, 2000, 2004, and 2008. The fast pitch style is also used in college softball and international competition.

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In baseball, softball, and similar games, an inning is the basic unit of play, consisting of two halves or frames, the "top" and the "bottom". In each half, one team bats until three outs are made, with the other team playing defense. A full baseball game is typically scheduled for nine innings, while softball games consist of seven innings; although this may be shortened due to weather or extended if the score is tied at the end of the scheduled innings. The use of the term inning in baseball and softball contrasts with cricket and rounders, in which the term is innings in both singular and plural.

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In baseball, a left fielder (LF) is an outfielder who plays defense in left field. Left field is the area of the outfield to the left of a person standing at home plate and facing towards the pitcher's mound. In the numbering system used to record defensive plays, the left fielder is assigned the number 7.

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Repechage is a practice in series competitions that allows participants who failed to meet qualifying standards by a small margin to continue to the next round. A well known example is the wild card system.

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A right fielder, abbreviated RF, is the outfielder in baseball or softball who plays defense in right field. Right field is the area of the outfield to the right of a person standing at home plate and facing towards the pitcher's mound. In the numbering system used to record defensive plays, the right fielder is assigned the number 9.

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A baseball field, also called a ball field, sandlot or a baseball diamond, is the field upon which the game of baseball is played. The term can also be used as a metonym for a baseball park.