midfielders could lead to defensive problems. The system was also fluid enough to allow the formation to change throughout play. The 4–2–4 was first used with success at the club level in Brazil by Santos, and was used by Brazil in their wins at the 1958 World Cup and 1970 World Cups, both featuring Pelé, and Mário Zagallo, the latter of whom played in 1958 and coached in 1970. The formation was quickly adopted throughout the world after the Brazilian success. Under the management of Jock Stein, Celtic won the 1966–67 European Cup and reached the final of the 1969–70 European Cup using this formation. It was also used by Vladimír Mirka in Czechoslovakia's victorious 1968 UEFA European Under-18 Championship campaign. He continued to use it after its waning days. 1–6–3 The 1–6–3 formation was first used by Japan at the behest of General Yoshijirō Umezu in 1936. Famously, Japan defeated the heavily favoured Swedish team 3–2 at the 1936 Olympics with the unorthodox 1–6–3 formation, before going down 0–8 to Italy. The formation was dubbed the "kamikaze" formation sometime in the 1960s when former United States national team player Walter Bahr used it for a limited number of games as coach of the Philadelphia Spartans to garner greater media and fan attention for the struggling franchise. Contemporary formations The following formations are used in modern football. The formations are flexible allowing tailoring to the needs of a team, as well as to the players available. Variations of any given formation include changes in positioning of players, as well as replacement of a traditional defender by a sweeper. 4–4–2 This formation was the most common in football in the 1990s and early 2000s, in which midfielders are required to work hard to support both the defence and the attack: typically one of the central midfielders is expected to go upfield as often as possible to support the forward pair, while the other will play a "holding role", shielding the defence; the two wide midfield players must move up the flanks to the goal line in attacks and yet also protect the full-backs. On the European level, the major example of a team using a 4–4–2 formation was Milan, trained by Arrigo Sacchi and later Fabio Capello, which won three European Cups, two Intercontinental Cups, and three UEFA Super Cups between 1988 and 1995. More recently, commentators have noted that at