What does the term "illegal pitch" refer to?

The term "illegal pitch" specifically refers to a delivery that results in a dead ball due to a defaced ball. This is because an illegal pitch indicates that something is wrong with the throw, such as a violation of proper pitching mechanics or the use of a ball that has been altered in a way that impacts its integrity. When a ball is deemed defaced or altered, it not only affects the play but also leads to the ball being called dead, which can have further implications for the game, such as allowing runners to advance.

In high school baseball, understanding the nuances of what constitutes an illegal pitch is crucial for umpires, as this ensures adherence to the rules and maintains fair play among teams. Knowing that a pitch can become illegal through issues like a defaced ball helps umpires make informed decisions during the game, contributing to the overall gameplay experience.