March 11, 2021, New York - Major League Baseball today again acknowledged the Atlantic League of Professional Baseball (ALPB) for its contributions to ongoing rules experiments MLB is conducting. In a press release announcing the implementation of several new rules in its various minor leagues, MLB cited the results of the same rules experiments in the Atlantic League in 2019 and reiterated that it will resume its three-year agreement with the Atlantic League this season and continue to test rule changes in ALPB ballparks. 

Here is the complete release from Major League Baseball:

• ALL LOW-A LEAGUES: Pitchers will be limited to a total of two “step offs” or “pickoffs” per plate appearance while there is at least one runner on base. A pitcher may attempt a third step off or pickoff in the same plate appearance; however, if the runner safely returns to the occupied base, the result is a balk. Depending on the preliminary results of this experimental rule change, MLB will consider reducing the limitation to a single “step off” or “pickoff” per plate appearance with at least one runner on base.
• LOW-A SOUTHEAST: In addition to the limitations on step offs/pickoffs, MLB will expand testing of the Automatic Ball-Strike System (“ABS”) that began in the Atlantic League and Arizona Fall League to select Low-A Southeast games to assist home plate umpires with calling balls and strikes, ensure a consistent strike zone is called, and determine the optimal strike zone for the system.
• LOW-A WEST: In addition to the limitations on step offs/pickoffs, following successful pace of game rules testing among Florida State League teams in 2019, on-field timers (one in the outfield, two behind home plate between the dugouts) will be implemented to enforce time limits between delivery of pitches, inning breaks and pitching changes. The on-field timer used in Low-A West will include new regulations beyond the system currently used in Triple-A and Double-A to reduce game length and improve the pace of play.