From TheChels.info - The Chelsea Football Club Wiki
The UEFA Cup Winners' Cup
(formerly the European Cup Winners' Cup
) was a club competition contested annually by the most recent winners of all European domestic cup competitions. The cup is one of the many inter-European club competitions that have been organised by UEFA. The first competition was held in the 1960-61 season, and the last in 1998-99. The competition was then abolished to make way for a further expansion to the UEFA Champions League
, with domestic cup winners now gaining entry into the UEFA Cup
, later renamed as the UEFA Europa League
. From its inception until 1994, the competition was known as the European Cup Winners' Cup - from the 1994-95 season onwards, UEFA officially named the tournament the 'UEFA Cup Winners' Cup'.
From 1972, the winner of the tournament would go on to play the winner of the European Cup (later the UEFA Champions League) in the UEFA Super Cup. Since the abolition of the Cup Winners' Cup, the Super Cup place previously reserved for the Cup Winners' Cup winner has been taken by the winner of the UEFA Cup.
Chelsea appeared in the competition on five occasions, and are the only English side to have won it twice; in their first appearance in the competition in 1971, beating Real Madrid 2-1 in a final replay, and in 1998, Gianfranco Zola scoring the only goal in the final against VfB Stuttgart.