encounter with Manchester United at Old Trafford, and with Real Madrid losing 1–0 and facing imminent elimination, United's Nani was sent off for a harsh charge on Álvaro Arbeloa. Mourinho quickly introduced Luka Modrić and moved Sami Khedira to the right flank, where Manchester United had a numerical disadvantage due to Nani's red card. This forced United manager Sir Alex Ferguson to move Danny Welbeck from the midfield to that flank, thus freeing Xabi Alonso, and two quick goals turned the game in Madrid's favour. In the second leg of the 2009–10 Champions League semi-final against Barcelona, Motta's controversial sending off led Mourinho to sit deep and narrow in order to defend their lead from the first leg away from home, while Barcelona were allowed to control possession. Mourinho also used his left winger Eto'o as a makeshift left-sided attacking wing-back. Although Inter lost the second leg 1–0, they advanced to the final 3–2 on aggregate; Mourinho later described the match as "the most beautiful defeat of [his] life." Mourinho is also renowned for always being well-informed about his next opponent and tactically outwitting other managers in games. In a 2004 Champions League knockout stage home game between Porto and Sir Alex Ferguson's Manchester United, Mourinho had already asserted that United's weakness was on the flanks, especially on the left where Quinton Fortune was protected by Ryan Giggs. The central pairing of Maniche and Deco targeted that flank with their threaded passes, and Dmitri Alenichev wreaked havoc. He set up Benny McCarthy's equaliser in the first half, then with United focussed on defending the left, Porto switched to the other side, where McCarthy was able to beat Gary Neville and Wes Brown to score the winner. Mourinho is also acknowledged for his attention to detail, organisational planning and in-game communication. In a 2013–14 Champions League knockout game against Paris Saint-Germain, when Chelsea needed one goal within 10 minutes to progress, he played a risky 4–1–2–3 in the last quarter, which led to Demba Ba's winning goal. After the game, Mourinho said that his team had worked excessively on three alternative formations in training: We trained yesterday with the three different systems we used, the one we started with, the one without [Frank] Lampard and finally the one with Demba and Fernando [Torres] in, and the players knew what to do. When Ba hit the winner, Mourinho darted down the touchline