#1 - Antonio Conte's substitutions work brilliantly
With Chelsea doing nothing of note up front, Antonio Conte decided enough was enough and took off the ineffectual Alvaro Morata and also his right wing-back Davide Zappacosta for Pedro just past the hour mark... and the effect was immediate and significant.
If the first goal, the one that started the comeback owed everything to Giroud's sheer determination to get to the ball first - Hoedt's elbow, and pressure, ignored with contemptuous ease - the second owed everything to the sheer attacking nous that both Giroud and Pedro had brought to the fore; Hazard freed up, and the Belgian made no mistake from close in.
The third then proved just why Olivier Giroud is a such an excellent buy - play to his strengths and there are no better second-choice strikers around.