Chelsea boss Jose Mourinho says Arsenal should have had three players sent off during Sunday's game.
The Blues dominated the game and never looked in trouble against the Gunners with Eden Hazard and Diego Costa getting the two goals which help Chelsea open a five-point gap at the top of the English Premier League.
"It was a difficult game," Mourinho said after the game.
"They started better than us, but Eden gave us the penalty and the first goal and the game could have finished there if it had been a red card.
"I think the referee has had a fantastic performance, but Arsenal could have finished with eight men, Koscielny could have a straight red, a double yellow for Chambers in the first half and a red for Danny Welbeck.
"During the game I don't want to speak with my medical department, I just want decisions. I have to watch the game. They told me he [Thibaut Courtois] was ready to continue but a few minutes later it was not possible."
The Portuguese clashed with Arsenal manager Arsene Wenger in the first half and says the Frenchman should have stayed within his own technical area.
"There are two technical areas not one," added Mourinho.
"He was coming to my space. If it was to give an instruction to a player I say OK, but to press the referee to give a red card to an opponent is not fair.
"I don't think that is the image of Arsene Wenger as an advocate of fair play."