grouped according to pitching style, type of pitch most often used, or velocity. This is especially common when pitching technique is rare or unusual. For example, there are many different variations on how the pitch is delivered, including the conventional overhand in which the ball is thrown from the 12 o'clock position, 3/4 styles (with the arm moving towards the plate between 12 and 3 o'clock), as well as the less common sidearm (3 o'clock arm angle, compare roundarm bowling in cricket) and 'submarine' (below 3 o'clock, compare underarm bowling in cricket) deliveries. The submarine pitch is rare, and a pitcher who throws in this way usually has a 'submariner' attached to his name or description. Similarly, there are many kinds of pitches thrown, including the fastball, curve ball, slider, and knuckleball. Capable knuckleballers are extremely rare and are usually described by this skill first. Matchups between left-handed batters and right-handed pitchers, or vice versa: For reasons that continue to spur debate, it is historically the case that most right-handed pitchers succeed at higher rates against right-handed hitters than against left-handers, and that most left-handed pitchers succeed at higher rates against left-handed hitters than right-handers. One substantial strategic element to baseball is to use this phenomenon as much as possible. Defenses try to force a match between pitcher and hitter by side, and offences attempt to mismatch them; both teams use substitutions at times to accomplish the desired outcome. One response to this phenomenon is that many hitters, among them a number of the finest and most powerful to play the game, such as Mickey Mantle, Eddie Murray, and Chipper Jones, became adept as youngsters to hitting both left-handed and right-handed to prevent defences from using that advantage against them. Many professional clubs employ as many as two or three switch hitters so as to neutralise the advantage of side selection. However, only one switch pitcher has played in the major leagues in modern times. A similar phenomenon in cricket is where the two opening batsmen are selected to be one left-hander and one right-hander, so as to make it difficult for the opposition to select a bowler who can specialize against either type of handedness. This can apply even to other batting partnerships. The prevalence of balls thrown at the batter's body: In addition, if a baseball batter is struck with a pitch, he is awarded first base; "hitting"