<P> The six - chair challenge took place over the course of two days, from 26 to 28 July 2017, at The SSE Arena, Wembley . Unlike previous years, where all four judges sat together, each judge was secluded on their own while their respective category performed . The three remaining judges sat together and gave their own critiques of the performance, before allowing the category's judge to make the final decision . It was broadcast over three episodes; Osbourne choosing in the first, Cowell and Scherzinger choosing in the second, with later portions of her decisions shown, alongside Walsh's, in the third . </P> <P> The judges' categories were announced in July 2017, with additional details of the judges' houses announced in October 2017 . Anthony Russell withdrew after the pre-recorded sections of the show and was replaced by Sam Black who was knocked out of the competition at the Bootcamp stage . Sam Black will be in Walsh's Boys category . In a statement, Walsh stated, "Anthony has been fantastic across the series, a great singer and performer who we are really sad to see go . I had to think for a long time who could take the place . Sam had a great reaction from the British public when his Audition aired . So I re-watched it and realised we missed a trick not putting him through at Boot Camp . He has that retro 60s style viewers will love . He's really likeable and talented and I can't wait to hear more ." At the end of judges' houses, it was announced that the public could vote for a wildcard from each category bringing the total amount of contestants for the live shows to 16 . </P> <Table> Summary of judges' houses <Tr> <Th> Judge </Th> <Th> </Th> <Th> Location </Th> <Th> Assistants </Th> <Th> Contestants eliminated </Th> <Th> Wildcards </Th> </Tr> <Tr> <Th> Cowell </Th> <Td> Groups </Td> <Td> Southern France </Td> <Td> Cheryl </Td> <Td> Lemonade, New Girl Band </Td> <Td> Jack and Joel </Td> </Tr> <Tr> <Th> Osbourne </Th> <Td> Girls </Td> <Td> San Francisco </Td> <Td> Jack and Kelly Osbourne </Td> <Td> Deanna Mussington, Georgina Panton </Td> <Td> Alisah Bonaobra </Td> </Tr> <Tr> <Th> Scherzinger </Th> <Td> Over 28s </Td> <Td> South Africa </Td> <Td> Stormzy </Td> <Td> Slavko Kalezić, Berget Lewis </Td> <Td> Talia Dean </Td> </Tr> <Tr> <Th> Walsh </Th> <Td> Boys </Td> <Td> Istanbul </Td> <Td> Mika </Td> <Td> Aidan Martin, Jack Mason </Td> <Td> Leon Mallett </Td> </Tr> </Table> <Tr> <Th> Judge </Th> <Th> </Th> <Th> Location </Th> <Th> Assistants </Th> <Th> Contestants eliminated </Th> <Th> Wildcards </Th> </Tr>

Who has which category on x factor 2017
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