Tonight sees the competition reach a new level as the dramatic Six Chair Challenge returns, promising some amazing performances and some tough decisions for the judges, as they must each choose the final six acts they will take through to Judges' Houses.In the first of two special Six Chair Challenge episodes the stakes are high as, for the first time in the competition, the acts perform live in front of an audience. Their judge then has to decide, right there and then, if they want the act to take one of the six seats on stage, each one representing a place in the next stage of the competition.However, even if they win a seat, the contestants face an anxious wait as no one is safe until the last person in each category has sung. Each judge is able to change their mind at any point swapping an act already through with someone else who comes on and out-performs them.Who will have what it takes to keep hold of their seat and be one step closer to a coveted place in the lives shows?