There's been plenty of discussion about Albert Einstein in English football this week. One of his most famous proverbs felt particularly apt at the Emirates on Saturday: "The definition of madness is doing the same thing over and over again, but expecting different results." If this is the case, Chelsea supporters have reason to be concerned about Antonio Conte.
Even in isolation, this was a terrible defensive performance from Chelsea in almost every respect. They were wide open when Arsenal countered, astonishingly deep when Arsenal had possession and incredibly nervous when Arsenal pressed high up the pitch.