What makes a pitch legal?

Q: What makes a pitch legal?

Key NFHS fastpitch pitching requirements (Rule 6): Before the pitch Both feet on the ground and in contact with or behind the pitcher's plate, with the hands separated (6-1-1). The pitcher must take or simulate taking a signal from the catcher while on the plate with hands separated (6-1-1b, a 2027 point of emphasis). She brings the hands together for at least one and no more than 10 seconds before starting the pitch. The delivery No more than one and a half revolutions of the arm in a windmill pitch, and no continuing the windup after the step or the release (6-1-4). The step must be forward, within or partially within the 24-inch width of the plate (6-1-2c). Leaping is legal: both feet may leave the ground at the same time, provided both stay within the 24-inch width and she doesn't replant the pivot foot (push off from anywhere other than the plate). The ball can't be delivered behind the back or through the legs. Pace and substances She has 20 seconds to release the next pitch after receiving the ball or after you say "play ball" (6-2-3). Only dirt, powdered rosin or a drying agent on USA Softball's certified list may be used to dry the hand (6-2-2).

Question

Accepted Answer

Key NFHS fastpitch pitching requirements (Rule 6):

Before the pitch

Both feet on the ground and in contact with or behind the pitcher's plate, with the hands separated (6-1-1).
The pitcher must take or simulate taking a signal from the catcher while on the plate with hands separated (6-1-1b, a 2027 point of emphasis).
She brings the hands together for at least one and no more than 10 seconds before starting the pitch.

The delivery

No more than one and a half revolutions of the arm in a windmill pitch, and no continuing the windup after the step or the release (6-1-4).
The step must be forward, within or partially within the 24-inch width of the plate (6-1-2c).
Leaping is legal: both feet may leave the ground at the same time, provided both stay within the 24-inch width and she doesn't replant the pivot foot (push off from anywhere other than the plate).
The ball can't be delivered behind the back or through the legs.

Pace and substances

She has 20 seconds to release the next pitch after receiving the ball or after you say "play ball" (6-2-3).
Only dirt, powdered rosin or a drying agent on USA Softball's certified list may be used to dry the hand (6-2-2).