The club changed its name to Alianza Lima in 1920. The League turned professional in 1951. Alianza participated in the amateur era of the Peruvian football league from that inaugural season, winning its first title in 1918. During its first years, it played irregularly against other teams from Lima and the port of Callao. Its matches against Atlético Chalaco from Callao stirred interest as a clash between limeños and chalacos. Sport Alianza had started to become a popular team drawing large support and this was the first derby or "clasico". Alleged four-in-a row The Alianza Stud changed owners and locations continuously and, consequently, the team was forced to relocate in turn, until 1928, when under the new name Alianza Lima, the club settled at the third block of the Manco Capac avenue in the La Victoria District, where it would stay and become the emotional home-base for club and fans alike. That same year Alianza played against the Federación Universitaria (University Federation) for the first time. This club which would later be renamed Universitario de Deportes and become Alianza's greatest rivals, in what is today the most important Peruvian derby. The 1930s brought great joy and frustration to the team. In 1931, 1932, 1933 and 1934, Alianza Lima won four championships in a row, for the first and so far only time in Peruvian football. However the Peruvian Football Federation did not recognize the championship of 1934 as won by Alianza. The championship was awarded to the club's biggest rival, Universitario. The memory of the four-in-a-row was tainted by the club's relegation in 1938, but after one season in the Lima Provincial League, one of the de facto first division leagues, the team returned to the First Division. Titles and cup performances During the 1940s, and start of the professional era in the 1950s, 1960s and 1970s, Alianza would win 10 championships. The club won two Peruvian titles in a row in 1977 and 1978, when its players formed the majority of the Peru national football team. The team had its greatest success at the international level in the 1976 and 1978 Copa Libertadores, in which managed to reach the semi-finals but lost to Deportivo Cali 1–4. Since then, its Copa Libertadores campaigns were not successful, during the 1990s the club managed to reach round of 16 several times including a semi-finals participation in the 1999 Conmebol's Copa Merconorte losing