Tess Daly and Claudia Winkleman invite viewers to join them forthe semi-final of Strictly Come Dancing. Fifteen couples havebeen whittled down to just four, with each couple having toperform two dances for a chance to win a place in the Strictlygrand final. Voting lines will open at the end of the show.Once the judges' scores have been added to viewer votes, thetwo lowest-scoring couples will perform again in the dreadeddance-off in the results show.