Jack and Jill is a format of competition in partner dancing, where the competing couples are the result of random matching of leaders and followers. Rules of matching vary. The name and format were created by Jack Carey at Hank & Stans in Norwalk, California in the early 1950s to encourage a variety of dancers to enter competitions. The gender-ambiguous term Pat and Chris has been used, particularly in LGBT dance venues, to refer to events where the gender of lead and follow isn't specified. In the swing dance community, the name Mix & Match (M&M) is now used as a gender-neutral, more inclusive name. In dance competitions J&J is included as a separate division (or divisions, with additional gradations). J&J is popular at Swing conventions, as well as at ballroom dance competitions in the US. J&J competitions are intended to test social dance skills, whereas fixed partner competitions test performance dance skills. Rules Rules vary, depending on country and dance style. In the UK, it is normal to randomly assign fixed couples, and then keep those couples fixed throughout the competition (for example, if there are multiple rounds). Thus, the winner is largely decided by luck of the draw, with the winning couple often being regular dance partners who were lucky enough to be paired together. As a result, DWAS (Dance With A Stranger) competitions are not taken as seriously as fixed partner competitions. In the US, Jack & Jill contests are extremely popular in the national West Coast Swing and Lindy Hop communities. Rules vary in events across the country but three rules seem to be standard in most Jack & Jill contests: 1) no choreography is allowed, 2) no costumes are allowed, and 3) no lifts or drops are allowed. However, at the Champion or Invitational level, event organizers will occasionally opt for an "anything goes" Jack & Jill in which no rules apply. Music for each dance is selected at random without the participants' prior knowledge, though some competitions will allow them to select the tempo (speed) or a sub-style within their dance's music (e.g. Blues or contemporary within West Coast Swing). Although it is not the case in every Jack & Jill contest, it is somewhat typical for dancers to be judged individually, then dancers who make any elimination rounds redraw for new partners. Depending on rules specific to the event/competition, a Jack & Jill