A variation of the 4–3–3 wherein a striker gives way to a central attacking midfielder. The formation focuses on the attacking midfielder moving play through the centre with the strikers on either side. It is a much narrower setup in comparison to the 4–3–3 and is usually dependent on the "1" to create chances. Examples of sides which won trophies using this formation were the 2002–03 UEFA Cup and 2003–04 UEFA Champions League winners Porto under José Mourinho's; and the 2002–03 UEFA Champions League and 2003–04 Serie A-winning Milan team, and 2009–10 Premier League winners Chelsea, both managed by Carlo Ancelotti. This formation was also adopted by Massimiliano Allegri for the 2010–11 Serie A title-winning season for Milan. It was also the favoured formation of Maurizio Sarri during his time at Empoli between 2012 and 2015, during which time they won promotion to Serie A and subsequently avoided relegation, finishing 15th in the 2014–15 Serie A season.