The Illinois High School Association sets the rules for all high school sports in Illinois, including softball. The IHSA follows standard high school softball rules set by the National Federation of State High School Associations. According to IHSA assistant director Kurt Gibson, the IHSA "does not deviate" from the national rules.
Pitching Rubber
The pitching distance in Illinois high school softball, from the pitching rubber to home plate, was 40 feet until the conclusion of the 2008-2009 season. The far point of home plate had been 40 feet from the back edge of the pitching rubber, which is placed in the middle of the pitching circle. However, the pitching distance was lengthened to 43 feet before the start of the 2009-2010 season.
Illegal Pitches
Pitchers may not make any deceptive moves when they are within the pitching circle and standing on the pitching rubber. The pitcher may only step forward when delivering the ball toward home plate. She cannot step backward, and she may not step toward the left or right side. If the pitcher does not step forward, it will be deemed an illegal pitch and the umpire shall call it a ball. If the batter chooses to swing, the batting team will have its choice of the results of the play -- or a called ball.
Designated Hitter
In Illinois high school softball, a designated hitter can be used. There are 10 fielders in the lineup and a coach can choose to make sure each one of those players gets to bat. However, if the coach chooses, a designated hitter can be used for one of the position players. The designated hitter does not have to be used for the pitcher, as is the case in baseball. The coach does not have to use the designated hitter if she chooses not to. However, if the designated hitter is not used to start the game, one cannot be brought in later in the game.
Strike Zone
The strike zone in Illinois high school softball is located just above the knees and just below the shoulders. Any pitched ball that is over the plate in this area will be called a strike. The plate is outlined by a black stripe. If the ball is goes over the black stripe, the umpire shall call it a strike -- as long as it is between the shoulders and the knees.



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