The Bases and Foul Lines: 1871–1873: National Association Professional of Base-Ball Players

Baseball history diagram: Bases and Foul Lines: 1871–1873: National Association Professional of Base-Ball Players. Prior to the start of the 1871 season, a fence, located at least 90' from Home Base, was added to the playing rules. Any pitched ball hitting a fence less than 90' from home base allowed all base runners to advance one base without being put out. Click diagram to return to previous page.