Throughout its 39-year history, the Cup Winners' Cup was always a straight knock-out tournament with two-legged home and away ties until the single match final staged at a neutral venue, the only exception to this being the two-legged final in the competition's first year. In common with other UEFA club tournaments, the away goals rule was applied when aggregate scores were tied. The format was identical to the original European Champions' Cup with 32 teams contesting four knock-out rounds prior to the showpiece final, with the tournament usually running from September to May each year. Following the influx of new UEFA member nations during the 1990s, a regular August preliminary round was added to reduce the number of entrants to 32.