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 Changing the Rules Chronology of Changes to Major League Baseball Official Rules Table J: Rule Changes 1930-1939 |
| Table J: Rule Changes 1930-1939 | ||
| DATE | RULE CHANGE | Rule |
| 1931 | A fair ball that bounces through or over a fence or into the stands is considered a ground-rule double instead of a home run. | 6.09 |
| 1931 | The sacrifice fly is eliminated. | 10.09 |
| 1933 | Three umpires to a daily game come into regular use. | |
| 1934 | Both major leagues are required to adopt the same brand of baseball. | 1.09 |
| 1935 | The first major league night baseball game is played, in Cincinnati on May 24 | |
| 1935 | The first umpire school opens, in Hot Springs, Arkansas. | |
| 1939 | The pitcher is allowed to have his free foot in front of or behind the rubber, with his pivot foot in front of or on the rubber (but always in contact with it). | 8.01 |
| 1939 | Six umpires are appointed to the World Series, two of whom work as alternates. | |
| 1939 | A batter is credited with a sacrifice fly and not charged with a time at bat if he hits a fly ball that is caught and a runner scores on the catch. This rule lasted only a year. | 10.09 |
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