With big rule changes coming to the MLB in 2022, fans will need this handy, inexpensive resource ​An important resource for umpires, coaches, leagues, and serious fans of Major League Baseball (MLB), this handbook lists the dos and don’ts of the national pastime. Fully up-to-date, this book contains the official and sanctioned MLB rules and their interpretations per the Playing Rules Committee, the sole group that determines baseball’s regulations.