leg, Barca changed their formation to what was effectively a 3–3–1–3, with David Villa in a centre-forward role, allowing Messi space between the lines and completely demolishing Milan's shape, ending in a 4–0 Barcelona victory. Later in the same season, tiki-taka's vulnerability was exposed when Bayern Munich defeated Barça 4–0 in the 2012–13 Champions League semi-finals and 3–0 in the return leg. Bayern head coach Jupp Heynckes had built upon his predecessor Louis van Gaal's foundations by making the team more defensively balanced, while replacing Van Gaal's "positional football"—everyone had to stick to their specific space on the pitch when attacking the opposition goal—with a much more fluid and attacking style that gave the forwards freedom to roam and swap. In the first leg, Barça enjoyed 63% possession but Bayern had 11 corners to Barcelona's four, and had nine shots on goal to Barça's one. Bayern's Bastian Schweinsteiger and Javi Martínez held a compact midfield that played crucial roles in shutting down Barcelona's Xavi's and Andrés Iniesta's attempts to pass forward at midfield, while Arjen Robben and Franck Ribéry proved effective on the wings. Bayern's first-half tactics involved "fake pressing", pushing close to their markers in possession to drive Barça away from danger areas with sheer presence, while conserving their energy by not committing themselves, keeping Bayern's players fresh enough for the second half to mount attacks. Though they had managed to outscore lesser opponents, Barcelona's defense was vulnerable, as the absence of center-backs Carles Puyol and Javier Mascherano robbed the team of physical presence to guard against set pieces which Bayern exploited. The Guardian proclaimed that "some suggested Bayern would attempt to outplay Barcelona at short passing football, but ultimately it was a perfect recipe of Barcelona's traditional problems: set pieces, counterattacks and physicality, that will lead many to suggest the balance of power has shifted from Catalonia to Bavaria." Tiki-taka was again exposed when Brazil defeated Spain 3–0 in the 2013 Confederations Cup final, ending Spain's run of 29 unbeaten matches in competitive football. The ball possession was 47% for Brazil and 53% for Spain, with two goals conceded in the first half of the match. Spain fared even worse in the 2014 World Cup one year later, as they lost to both the Netherlands and Chile and failed to progress beyond the group stage. 2013–2014 season Diego Simeone's Atlético Madrid faced Barcelona six times in the 2013–14