The fields on which regulation baseball games are played vary from right field to center to the left field. The height of the walls which enclose a field also vary. The pitcher is the first line of defense for a team. Some common pitches are the slider, curve ball, fast ball and change-up. The screw ball, fork ball, knuckle ball, and split finger are specialty pitches and not all pitchers can throw them.
Most pitchers have at least four pitches that are their bread and butter.
The pitcher works closely with the catcher and must be willing to take direction from him. The catcher plays behind the home plate, in front of the umpire. He is the second most active defensive man on the field. An effective catcher must have a gun for a throwing arm with quick release and soft hands. A catcher must help maintain the flow of the game by working together with the pitcher to call types of pitches.