Two years later, Ourense advances to Primera División B, the second tier, where it plays three seasons before promoting to Liga ACB in 1989 as champion of the league.

In the top league, COB plays during nine seasons alternating title and relegation playoffs in its first years.

Finally, it is relegated to LEB Oro in the 1998 playoffs, the third series the club played in three consecutive seasons.

COB came back to LEB Oro in 2009 after buying the vacant spot of Cantabria Lobos.

[1] However, on 17 September 2015, the assembly of the league ratified the promotion to the 2016–17 season, independently of the position at the 2015–16 LEB Oro.