The contemporary sport of ice hockey was developed in Canada, most notably in Montreal, where the first indoor game was played on March 3, 1875. Some characteristics of that game, such as the length of the ice rink and the use of a puck, have been retained to this day. Amateur ice hockey leagues began in the 1880s, and professional ice hockey originated around 1900. The Stanley Cup, emblematic of ice hockey club supremacy, was first awarded in 1893 to recognize the Canadian amateur champion and later became the championship trophy of the NHL. In the early 1900s, the Canadian rules were adopted by the Ligue Internationale de Hockey Sur Glace, the precursor of the IIHF, and the sport was played for the first time at the Olympics during the 1920 Summer Olympics. Despite women having played since the beginnings of the game, women's hockey was not professionally organised until much later, the first IIHF Women's World Championship being held in 1990 and being introduced into the Olympics in 1998.