There was huge controversy on 17 minutes as Kieran Gibbs was mistakenly sent off for handling on the line when it was Alex Oxlade-Chamberlain who committed the offence. Eden Hazard stepped up to take the resulting penalty and made it 3-0.
Read Sports Mole's minute-by-minute report below to find out how all of the action unfolded at Stamford Bridge.
6 - Arsenal have won their last six Premier League away games in London, including all four this season. Neighbours.— OptaJoe (@OptaJoe) March 22, 2014
"I congratulate Arsene in reaching this momentous landmark. Having also reached the same milestone at one club, I cannot emphasise enough the level of dedication, resilience as well as sacrifice required and for that I have for the utmost admiration.
"Over the years we enjoyed some fantastic battles and you could say we had survived together and respected each other's efforts to play good football. I always enjoy watching Arsene's sides – Arsenal play the right way. Playing against them always presented special challenges that I burned many hours over the years thinking about.
"He has always been a conscientious member of our trade who makes it his business to help other managers. Perhaps the biggest compliment I could give Arsene is that I could never be anything other than competitive with my rival for 17 years.
"Overall this achievement once again shows what stability can bring to a football club and without doubt he has created a permanent legacy during his 1000 matches with the club."
10 - Jose Mourinho has never lost against Arsene Wenger as an opposition manager (W5 D5 L0 in all comps). Nemesis.— OptaJoe (@OptaJoe) March 22, 2014
502 - Arsene Wenger has taken charge of 502 competitive matches at Arsenal since they last won a major trophy. Frustration.— OptaJoe (@OptaJoe) March 21, 2014
1 - Chelsea have only failed to win one of the 127 Premier League games that they've led by 3+ goals (3-3 v Man Utd in Feb 2012). Over.— OptaJoe (@OptaJoe) March 22, 2014
4 - This is only the third time in Premier League history that Arsenal have conceded 4+ goals in the first half of a game. Steamrollered.— OptaJoe (@OptaJoe) March 22, 2014
6 - This is the fourth time that Arsenal have conceded 6+ goals in a Premier League game, two of those games have been this season. Rout.— OptaJoe (@OptaJoe) March 22, 2014