At about the same time that catchers began fielding their position closer to home plate, baseball teams began using a less rubbery ball which led to a decline in the number of runs scored. In the 1860s it was common for teams to score fifty or sixty runs in a game. The combination of the new, harder ball and the continuation of the rise in pitcher's release points helped usher in what became known as the Dead-ball era. The decrease in run production placed greater significance on stolen bases and bunts, which in turn emphasized the crucial defensive role played by catchers. In , the National League introduced a new rule specifying that the catcher must stand within 10 feet of home plate. The American League adopted the rule the following year.