Arsene Wenger celebrated his 1,000th game as Arsenal manager with a trip to Stamford Bridge, but his squad gave him 90 minutes to forget.
The Gunners started badly conceding twice in the opening ten minutes, while later an Eden Hazard attempt on goal hit the outstretched hand of Alex Oxlade-Chamberlain resulting in a penalty AND a red card.
Incredibly referee Andre Marriner sent off Kieran Gibbs instead despite Oxlade-Chamberlain explaining it should have been him!
The Blues swept aside ten men Arsenal ultimately scoring six and destroying The Gunners title hopes.