Origins The Stanley Cup was commissioned in 1892 as the
Dominion Hockey Challenge Cup and was named after
Lord Stanley of Preston, the
Governor General of Canada who donated it as an award to Canada's top-ranking amateur ice hockey club. The entire Stanley family supported the sport, the sons and daughters all playing and promoting the game. The first Cup was then awarded in 1893 to
Montreal Hockey Club. During the period from 1893 to 1914, 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 Cup challenge was determined by negotiation between the two clubs. Furthermore, none of the leagues that played for the Cup had a formal playoff system to decide their respective champions; whichever team finished in first place after the regular season won the league title. A playoff would only be played if teams tied for first-place in their leagues at the end of the regular season. As the prestige of winning the Cup grew, so did the need to attract top players, and thus professional teams first became eligible to challenge for the Stanley Cup in 1906. Then in 1908, the
Allan Cup was introduced as the trophy for Canada's amateurs, and the Stanley Cup became a symbol of professional hockey supremacy. In 1910, the
National Hockey Association (NHA) held its inaugural season and soon emerged as the best professional hockey league in Canada, keeping the Cup for the next four years. In 1914, the
Victoria Aristocrats of the
Pacific Coast Hockey Association (PCHA) challenged the NHA and Cup champion
Toronto Blueshirts. One year later, the NHA and the PCHA began an agreement in which their respective champions would face each other annually for the Stanley Cup, effectively ending the
Cup challenge games. After years of the NHA not having an annual playoff tournament to determine its league champion, the
1916–17 NHA season saw the league split its schedule into two halves with the top team from each half moving on to the league finals, which was a
two-game total goals series. The PCHA continued to award their league title to the team that finished in first place after the regular season.
Emergence of the NHL The
National Hockey League (NHL) was founded in November 1917 as a successor to the NHA. From the NHL's inception until 1920, both NHL and PCHA teams were eligible for the Stanley Cup. The NHL inherited the NHA's regular season system of dividing it into two halves, with the top team from each half moving on to the league finals. The NHL finals was a
two-game total goals series in 1918 and a best-of-seven series in 1919. In 1920, the
Ottawa Senators were automatically declared the league champion when the team had won both halves of the regular season. The two halves format was abandoned the next year, and the top two teams faced off for the NHL championship in a two-game total goals series. At the time, the NHL champion would later face the winners of the PCHA and, from 1921, the
Western Canada Hockey League (WCHL) in further rounds in order to determine the Stanley Cup champion. During this time, as the rules of the NHL and those of the western leagues differ (the main difference being that NHL rules allowed five skaters while the western leagues allowed six), the rules for each game in the Stanley Cup Final alternated between those of the NHL and the western leagues. Before the WCHL competed for the Stanley Cup, the Cup championship series was a best-of-five series. Following the involvement of the WCHL, one league champion was given a bye straight to the finals (a best-of-three affair starting in 1922), while the other two competed in a best-of-three semifinal. As travel expenses were high during these times, it was often the case that the NHL champions were sent west to compete. In a dispute between the leagues in 1923 about whether to send one or both western league champions east, the winner of the PCHA/WCHL series would proceed to the Stanley Cup Final, while the loser of the series would face the NHL champion, both series being best-of-three. In 1924, the NHL playoffs expanded from two to three teams (with the top team getting a bye to the two-game total goal NHL finals), but because the first-place
Hamilton Tigers refused to play under this format, the second and third place teams played for the NHL championship in a two-game total goals affair. The Stanley Cup Final series returned to a best-of-five format the same year.
NHL takes control of Stanley Cup With the merger of the PCHA and WCHL in 1925 and the merged league's collapse in 1926, the NHL took de facto control of the Stanley Cup. While the Cup would not be formally deeded to the league until 1947, from 1926 onward the NHL playoffs and the Stanley Cup playoffs are considered synonymous. The NHL was subsequently divided into the Canadian and American divisions for the 1926–27 season. For 1927, six teams qualified for the playoffs, three from each division, with the division semifinals and finals being a two-game total goals affair, and the Stanley Cup Final becoming a best-of-five series. In 1928, the playoff format was changed so that the two teams with identical division ranking would face each other (i.e., the division winners played each other, the second place teams play each other, and likewise for the third place teams). The first place series was a best-of-five affair, with the winner proceeding to the best-of-three Stanley Cup Final, while the others were a two-game total goals series. The winner of the second and third place series played each other in a best-of-three series, with the winner earning the other berth to the Stanley Cup Final. This format had a slight modification the following year, where the semifinal series became a two-game total goals affair and the Stanley Cup Final became a best-of-five series. The two-game total goals format was abolished in 1937, with those series being changed to best-of-three affairs.
Original Six era (1942–1967) The 1930s saw the reduction of teams from ten to seven, which resulted in an end to the Canadian and American divisions. The Stanley Cup playoffs saw the first- and second-place teams play against each other in a best-of-seven series for one berth in the Stanley Cup Final, while the third- to sixth-place teams battled in a series of best-of-three matches for the other berth (with the third-place team taking on the fourth-place team, and the fifth-place team against the sixth-place team). In 1939, the Stanley Cup Final became a best-of-seven series, the format still used today.
Temporary formats during the COVID-19 pandemic Special formats were used in 2020 and 2021 due to the
COVID-19 pandemic. As a result of the pandemic prematurely ending the
2019–20 regular season, a 24-team, conference-based format (with 12 from each conference) was adopted for the
2020 playoffs. Seeding was based on each team's points percentage at the time the regular season was suspended on March 12. The top four teams competed in a
round-robin tournament to determine final seeding in the first round, while the bottom eight seeds in each conference played in a
best-of-five series to determine who advanced to face one of the round-robin teams in the first round, after which they were re-seeded 5th–8th. Teams then were re-seeded after each round similar to the conference-based formats used from 1994 to 2013. The closure of the
Canada–United States border during the
2020–21 regular season caused the NHL to temporarily abolish both conferences and realign into four different divisions, putting all Canadian teams into one of those divisions. The top four teams in each division then made the
2021 playoffs. All four rounds of the playoffs remained as best-of-seven series, and the first two rounds of the playoffs featured intra-divisional matchups similar to the division-based formats previously used. The four division champions were reseeded based on regular season point total in the Stanley Cup semifinals. The best-ranked division winner played against the worst-ranked division winner, while the other two division champions faced-off against each other, with the second-best division champion having home-ice advantage. The winners of these series advanced to the Stanley Cup Final, as before. ==Traditions and trends==