“The surprise package in the second half of Premier League season was the only side who switched to a back three on a permanent basis. It seems odd to trace Roberto Martinez’s successful experiment with a three-man defence back to an eight-goal defeat, but that’s where we’re going to start. On the final day of the 2009/10 season, Wigan travelled to Stamford Bridge, where Chelsea needed a win to make sure of the Premier League title. Chelsea won 8-0.” Zonal Marking