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Rule 6.3.K (FP)
"The pitcher must not make another revolution after pitching the ball."
Rule 6.3.I (Modified)
"The pitcher shall release the ball on the first forward swing of the arm past the hip."
Rule 6.3.D (SP)
"The pitcher must deliver the ball on the first forward motion...past the hip."
POE #40 - Pitching (FP)(pg 152)
"The pitcher's hand may go past the hip twice, as long as there are not two complete revolutions. The wrist may not be farther from the hip than the elbow."
Slow Pitch Plate Mechanics - Page 209
In determining an illegal pitch - "Was the ball released first time past the hip?"
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