Slow pitch vs fast pitch

The manner of slow pitch softball, also known as "lob ball," in which the ball is delivered by the pitcher is the key distinguishing feature between the two types of softball. Where the fast-pitch game depends on a powerful pitcher who can deliver the ball with either great velocity or with deceptive ball movement, slow pitch encourages the batter to hit the ball, put the ball in play, and force the defensive team to make strong fielding plays to generate outs, as opposed to strikeouts by the pitcher.
In slow pitch, the pitcher must deliver the ball underhanded, with a minimum arc of 6 ft and a maximum arc of 12 ft. The umpire has the discretion to rule a pitch as illegal due to insufficient or excessive arc. Most pitchers attempt to deliver the ball in such a fashion that the ball is dropping in an arc that is as close to perpendicular to the ground as possible.
Although they have there differences, slow pitch softball and fast pitch softball are played on fields with similar dimensions. there are other rules that have a significant impact on how the two games are played. Fast pitch is played with nine players in the field, including the pitcher and the catcher; slow pitch is played with 10 players, with the additional player almost always positioned in the outfield, either in a relatively fixed location or as a rover. The additional player in slow pitch is intended to counter to some degree the additional hitting and offense that is invariably a part of the slow-pitch game.
Fast pitch is played with virtually all of the rules of traditional baseball and therefore employs very similar strategies. Through the removal of the high speed offering from the pitcher to the batter, slow pitch by definition is both a safer and an easier game to play and is also well suited for different age group competitions.