Series 1, 2, 3, 4, 8 and 9 had no dance-off in the semis by design (although series 8 and 9 did have a double elimination). The dance-off in the semis for series 6 was cancelled at the last minute because there was no way for Tom to escape it. The dance-off in the semis for series 7 was scrapped during the week beforehand, because of the scandal the previous year. Interestingly, if the dance-off had been in place, and the votes remained the same, Chris would (barring fire or flood or Ali breaking a hip) have gone home, leaving a Ricky vs Ali final. Series 5, 10, 11, 12 and now 13 all have had a dance-off in the semis. Every single time the person at the bottom of the judges leaderboard went home.