List of Stanley Cup challenge games

During the period from 1893 to 1914, the Stanley Cup was a "challenge trophy"; the champions held the Cup until they lost their league title to another club, or a champion from another league issued a formal challenge and subsequently defeated them in a special game or series. The competitive format of each challenge was determined by negotiation between the two clubs, and the contesting clubs did indeed make several arrangements during this 22-year period.

Source: Wikipedia — List of Stanley Cup challenge games (CC BY-SA 4.0)