On 9 May 2018, Allegri won his fourth consecutive Coppa Italia title, in a 4–0 win over Milan. Four days later on 13 May, following a 0–0 draw with Roma, Allegri secured his fourth consecutive Serie A title, becoming the first manager in Europe's top five leagues to win four consecutive doubles. On 17 May 2019, after Juventus had already secured its fifth straight Scudetto under Allegri on 20 April, Juventus announced that he would leave the club at the end of the season. Allegri has been praised for his tactical intelligence and his ability to build effectively upon Antonio Conte's successful tactics and winning mentality as Juventus's manager, albeit in a less rigorous manner. He initially continued to use Conte's trademark 3–5–2 formation, but later switched to a four-man back-line, in particular in the UEFA Champions League. Under Allegri, Juventus became slightly less aggressive and intense in their pressing off the ball while their playing style became more patient and focussed on keeping possession and gaining territorial advantage in order to conserve energy, tactics which he had previously used while at Milan. Although Allegri's team was still effective at winning the ball in midfield and scoring from counter-attacks, the club's attacking play on the ball usually involved a slower build-up, which mainly consisted of short passes, and fewer long balls from Pirlo and Bonucci. Goalkeeper Buffon also continued to primarily play the ball out from the back with short ground passes to the defenders, but he also began to use deeper goal kicks out to the wings. Allegri has also been lauded for his versatility, which he demonstrated by adopting and switching between several different formations during his first season with Juventus, including the 4–3–1–2, the 4–4–2 and the 4–3–3 formations, which he had also previously adopted while at Milan in order to find the most suitable system for his players. The fluidity of Juventus's formations under Allegri allowed talented players more freedom and creative licence and enabled the midfielders to make attacking runs into the area. Despite implementing several changes, Allegri still managed to preserve Juventus's defensive organisation and strength—this was further demonstrated by his tendency to switch to the 3–5–2 in the final 20 minutes of closely contested matches in order to hold on to the result as well as by his tendency to play behind the ball with two deep, tight defensive lines when facing teams that dominated possession, preferring instead to focus on breaking up play and adopting a counter-attacking style of play similar to that which he had previously also used with Milan.