50/70 games are played only on Sundays, on a diamond which is larger than the Majors diamond and smaller than a High School diamond, allowing players to grow gradually. The pitcher stands 50' from the plate (the distance is 46' in Little League up through majors), and the bases are 70' apart, rather than 60'.
50/70 rules allow runners to take leads and steal at any time, allow pitchers to pick runners off, and enforce balks, for a more exciting game. These rules also encourage learning of situational awareness, attention, baserunning and fielding fundamentals, challenging players to grow as players and teammates.