Wikipedia - Swiss League

The Swiss League is the second tier of the main professional ice hockey league in Switzerland, behind the National League. The winners of the league each season plays a best-of-seven series against the bottom team of the NL, and if they win, they are promoted, while the National League team is relegated to the Swiss League.

Prior to the 2017–18 season, the league was formerly called National League B. The league attendance in 2018–19 was about 2,700 spectators.