Trick pitch is a type of pitch in baseball that is used to deceive the batter. The three types of trick pitches are SINKER, slider, and forkball. A SINKER is a pitch that has downward movement and is usually thrown with a two-seam grip. A slider is a pitch that has sideways movement and is usually thrown with a four-seam grip. A forkball is a pitch that has a combination of downward and sideways movement and is usually thrown with a split-finger grip.