Originally Posted by Matt&AlionaFan:
“The last three years there has been no dance-off in the semi's and probably since about series five if memory serve's me correctly.”
Series 5 - I don't think it had a dance-off at all.
Series 6 - they reintroduced the dance-off, but had that kerfuffle in the semi-final and had to abandon having a dance-off because the judges putting both Lisa and Rachel in joint first place meant that Tom could not have gone through, even with the viewers putting him in first place (which they would have done). In those days first place meant three points and third place one point, whereas these days they would give third place two points.
Series 7 - still had the dance-off, but not in the semi-final, so Ali & Brian left, despite being second on the leader-board, since Chris Hobbit's public vote saved him, giving a three-couple final.
Series 8 & 9 - dance-off throughout the series, but not in the semi-final, where two couples were eliminated from the remaining five couples, giving a three-couple final.
Series 10 - dance-off back for the semi-finals, where Denise and James beat Lisa and Robin for the final place in a four-couple final.
Since the BBC has confirmed it will be a four-couple final again, the likely scenario is that it will be a repeat of Series 10, with a dance-off to find the final couple.
With thanks to Ultimate Strictly, a truly brilliant website.