In 1903, the Pirates were defeated by the Boston Americans in the first World Series. The Pirates returned to and won the World Series in 1909, over the Detroit Tigers. Since then the Pirates have won World Series in 1925, 1960, 1971, and 1979. In addition to these five World Series victories the Pirates have won nine National League pennants and qualified for the playoffs fifteen times, six of which were during a run of twelve winning seasons between 1969 and 1980.