To warm you up for this weekend's big Premier League game between Chelsea and Arsenal, we have a quiz for you revolving around those who have been involved at both clubs during their footballing career...
The prestigious fixture was first played in November 1907 and we have never played against another side more often, with this Saturday's meeting the 197th fixture between the reds of north London and the Blues of south-west London.
There have been 29 people who have either played for both sides, or played for one and managed the other. Our quiz centres on them and spans many different decades to test the breadth of your knowledge.
There are 10 questions and you will have 30 seconds to answer each one. Share your results once you have finished and see how you compare to your fellow Blues supporters!