Check out this article. Batter can attempt to steal first base on any pitch not caught by the catcher and can be thrown out or safe at first depending on outcome.
I am intrigued...
https://www.foxnews.com/sports/atlantic-league-stealing-first-base-tony-thomas.amp
I am intrigued...
https://www.foxnews.com/sports/atlantic-league-stealing-first-base-tony-thomas.amp