be performed in one week by each of the remaining contestants. From series 4 to 7, the remaining contestants who made it to the semi-final were granted to perform the semi-final-exclusive Argentine Tango. As of series 10, the contestants are now allowed to perform any of the chosen dances in any week, though the Argentine Tango remains generally reserved for the latter stages of the competition. The Showdance, however, continues to only be performed in the final. Coaching As of series four, coaches are Jaclyn Spencer and Chris Marques (aka Cuban Groove) for Salsa and Mambo, and Jenny Thomas and Ryan Francois for Swing, Jive, Rock N’ Roll and The Charleston. The Argentine Tango coaches in series three were Flavia Cacace and Vincent Simone, both of whom have subsequently competed in the show. Results show From series 1 to 4, the results show was shown live on Saturday night one hour after the performances. As of series 5, the results show is recorded on the Saturday night directly after the live show and incorporates the result of the viewers' votes, which are completed by 21:30. This was confirmed by the official BBC website in 2008: Throughout the Sunday results show, the presenters refer to 'Saturday night' in reference to the main show due to the timing of the Sunday programme, and the outfits of Tess Daly, Claudia Winkleman and the judges are changed to present an illusion of a second live broadcast. For series 7, the Sunday results show was axed and put back to Saturday nights as a result of a revamp of the show. It then reverted to Sundays from series 8. Dance-off A new system called the Dance-off, which takes place in the results show, was introduced in series 5. It continued until series 7, but did not return in series 8. It was then reinstated in series 10 and has remained a feature of the show ever since. There Dance-off consists of the two couples who received the lowest totals that week from the combined judges' scores and public vote. The aim of the dance-off is for the couples to convince the judges that they deserve to go through to the following week's competition. Before they attempt their dance a second time, the couples sometimes get advice from the judges. The judges then decide which couple remains in the competition based on the dance-off performances. If