In the final game, at neutral Nya Ullevi in Gothenburg, BoIS had to play Skövde AIK and at least another draw was required for the promotion. It began bad, as Skövde scored twice, but by goals from Sonny Johansson and Leif Carlsen, Landskrona BoIS finally managed to be promoted back to Allsvenskan, after an absence for 21 seasons. As a result of the success, the Danish player Leif Carlsen was forced to leave BoIS. By 1971, the Swedish Football Association didn't allow foreign players in Allsvenskan. During the 1971 season Landskrona BoIS managed to finish on 6th place, but won only 5 games. Their home average attendance during the season was 8,504 presumably their best ever (by 2014). BoIS stayed in Allsvenskan for ten seasons, which included two bronze medals 1975 and 1976 and a Swedish Cup victory in 1972. During the 1970s their former rivals from Helsingborg had no luck in their attempts to return to Allsvenskan, and the main rivals instead became Malmö FF. In 1974 BoIS beat Malmö FF, with 2–1, for the first time at Malmö Stadion, in front of 24,746 attenders. Worse was the 1975 home game against Malmö FF, as the guests won 0–5, the attendance in Landskrona that year was though as high as 17,696, the second best attendance at IP. The club's ever main star Sonny Johansson contributed to this in a major way. Sonny played for the club from 1968 to 1984 and scored more than 300 goals. He was the highest-scoring player in Allsvenskan during the 1970s. In 1971, Claes Cronqvist returned to the club and remained until the relegation in 1980. Unlike in the 1960s when he was a forward, he mostly played as defender during the 1970s. Cronqvist holds the record for being sent off more than any player in Allsvenskan, 7 times, including 5 times while representing BoIS (1971–80) and twice during his time with Djurgården. In autumn 1978, the club got into problems. The supposed manager for the years to come, Lennart Söderberg, changed his mind in a very late stage, and suddenly the club was without a manager for the next season. After a hasty search, Ulf Schramm became manager. But already in the spring of 1979, the players began to make severe complaints to the chairman and board, suggesting that Schramm was "incompetent". This soon led to the dismissal of Schramm. At this time,