As with the men's Sevens World Series, teams compete for the title by accumulating points based on their finishing position in each tournament.[6] First, the USA event moved from Las Vegas to the Denver suburb of Glendale, Colorado.Games are much shorter, generally lasting only seven minutes per half, and tend to be very fast-paced, open affairs.The game is both quicker and higher-scoring than 15-a-side rugby and the rules are simpler, which explains part of its appeal, and also gives players the space for superb feats of individual skill.Prior to the inaugural season, a group of "core teams" that are guaranteed places in all series events was announced.This was part of an IRB initiative to help jump-start women's rugby development in the country, which is set to host the 2016 Summer Olympics.Four additional core teams were determined in a 12-team qualifying tournament held in Hong Kong on 12–13 September 2014.