The 16 months that Antonio Conte has spent as manager of Chelsea has seen great evolution in the team's shape.
Last season began with the manager deploying an adventurous but foolhardy 4-2-4, which was followed by a brief return to the 4-2-3-1, which had been used by his predecessors dating back to Carlo Ancelotti. September 2016's radical switch to a back three then became Chelsea's staple as they romped away with the Premier League title.
The first few months of this season have had similarities with 12 months ago as a variety of systems have been used while personnel changed.