You need to produce top spin on the ball
A good way to practice is by taping two balls on top of each other or by taping the caps of two 16 oz pop bottles together and then throwing them.
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Knuckleball Schwartz of the Washington Senators.
you can throw a great knuckle curve by not snapping ur wrist bur holding i side way towards h ground 4 extra roation use a trditional knucklecurve grip
Who Knows. An effective curve is 70's to low 80's. Any faster and you might as well throw a slurve or slider.
"Choke" the ball (wedge it down between your thumb and forefinger), and tilt your wrist to the left; the ball snaps down and to the right on release. The resulting pitch should drop and curve to the left. Experiment with different speeds and spins. The best method of a curve ball is to learn to throw it curved upward. Instant strike every time, guaranteed.
According to his website, he used the standard fastball, curve, and change-up. He has been honest about also illegally using a doctored ball during his career.