Both Saturday night entertainment shows have regularly overlapped during their recent runs, with Strictly often pulling in more viewers for the BBC during the 10 to 15 minutes that they are both on air.
X Factor has pulled in larger overall numbers in the Saturday evening ratings battle, but does have the benefit of airing in a later slot.
Strictly has twice beaten the ITV1 talent show on Saturdays this year, with its Halloween and Wembley weekend specials drawing bumper audiences.
However, X Factor's Sunday instalments have remained dominant and they have not been beaten in the results show ratings.
According to The Sun, the two series will overlap again on the weekend of December 10, when the X Factor live final will air.
Last year, the BBC and ITV appeared to reach an unspoken agreement about avoiding scheduling clashes for their biggest entertainment shows, as Strictly was pushed into an earlier timeslot.
Strictly airs this Saturday (November 26) from 7pm to 8.15pm on BBC One. The X Factor quarter-final will kick off at 8pm on ITV1.
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