All about the rules
Using the intent of the ASA/ISA pitching rules as a guide, the following will illustrate the differences between 9-Man and 10-Man Modified pitching rules.
I have segmented the various body parts (Wrist, Elbow, Shoulder), and have included pictures to illustrate the differences between the two styles.
The ball IS allowed to be outside of the wrist resulting in the thumb pointing up and palm facing third base for a right handed pitcher (first base for a left handed pitcher). A Right Handed 9-Man style pitcher rotates the humereus in the shoulder socket in a clockwise direction on the back swing (turning the door knob).
The ball can NEVER be outside of the wrist at any point in the delivery. The wrist can NEVER be cocked laterally resulting in the palm facing third. The humereus is NEVER rotated clockwise.
The elbow can be cocked laterally any time or all the time, including the release (this allows the wrist to be outside of the elbow, which in turn allows the ball to be outside the wrist).
The elbow can never be cocked laterally (if it is, then the wrist will be outside the elbow and the ball will be outside the wrist) . In addition, the elbow MUST be locked (no angle) on release of the ball.
There is no restriction on the angle of the humereus/torso as shown in the following images.
read more The angle created between the humereus and the torso 9 - Man →
I will state right here that there is no ASA/ISA rule on this topic. However, other than the ball being outside the wrist, this is perhaps the next most important difference between 9-Man and 10-Man Pitching.
The Humereus/Torso angle should not be greater than 90 degrees. This angle can be determined by drawing a line from the hip socket to the shoulder socket. Then draw a line, 90 degrees from that line as shown in the following images.
read more The angle created between the humereus and the torso 10 – Man →
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Sal Guerriero 2008
