We performed a site update on April 16, 2013. Please let the admin know if you User_talk:Admin#APRIL_16.2C_2013 encounter any issues. All updates have been performed.
From BR Bullpen
A forkball is a pitch that can be considered a variety of change-up. The pitcher grips a forkball by spreading his index and middle finger very wide apart and jamming the ball into the space between them. The forkball should not be confused with the splitter, another pitch thrown with the fingers spread wide apart.
According to Thorn and Holway's 1987 book The Pitcher, Mike Lynch taught himself to throw the forkball but couldn't control it. A few years later he taught the young Bert Hall, who may have been the first pitcher to throw it in the majors, in 1911.