The IIHF World Women's Championship, officially the IIHF Ice Hockey Women's World Championship, is the premier international tournament in women's ice hockey. It is governed by the International Ice Hockey Federation (IIHF). The official world competition was first held in 1990, with four more championships held in the 90s. From 1989 to 1996, and in years that there was no world tournament held, there were European Championships and in 1995 and 1996 a Pacific Rim Championship. From the first Olympic Women's Ice Hockey Tournament in 1998 onward, the Olympic tournament was played instead of the IIHF Championships. Afterwards, the IIHF decided to hold Women's Championships in Olympic years, starting in 2014, but not at the top level. In September 2021, it was announced that the top division will also play during Olympic years. Canada and the United States have dominated the Championship since its inception. Canada won gold at the first eight consecutive tournaments and the United States has won gold at nine of the last eleven tournaments. Both national teams placed either first or second every tournament until Canada's streak was broken at the 2019 Championship. Finland is the third most successful World Championship team, having won thirteen bronze medals and one silver medal – achieved after breaking the Canadian gold-silver streak. Four other teams have medalled at a Women's World Championship: Russia, winning three bronze medals; Sweden, winning two; and Switzerland and Czechia, each winning one. Structure and qualification The women's tournament began as an eight-team tournament featuring Canada, the US, the top five from the 1989 European Championships, and one Asian qualifier. The same formula was used for 1992, 1994, and 1997, but changed following the first Olympic women's ice hockey tournament at the 1998 Nagano Olympics. The top five teams from the Olympic tournament qualified for the 1999 World Championship, followed by the best three from final Olympic qualification rounds. Beginning in 1999, the championship became an annual tournament and the first divisional tournaments below the Top Division were played. Along with the creation of the lower divisions, a system of promotion and relegation was introduced, allowing for movement between all divisions. After the 2017 tournament, it was announced that tournament would expand to 10 teams for 2019, having been played with 8 teams since the first tournament in 1990, except in 2004, 2007, 2008, and 2009, where 9 teams played. The 2004 edition featured 9