Real Madrid had not lost by four goals at home in a league game in decades. On 2 May 2009, nine minutes into that Clasico at the Bernabeu, Pep Guardiola told Samuel Eto'o and Lionel Messi to swap starting positions. Messi, nominally a right winger, began drifting into the pocket just in front of Barcelona's midfield three, and Real Madrid's back line had no settled answer for who was supposed to follow him. By full time the scoreboard read 2-6, and a tactical idea that had lived in football's margins for half a century suddenly had a face the whole sport recognized.
The role needed a name, and writers reached for an old one: the false nine, a forward who wears the shirt number but does not occupy the position. What Guardiola did with Messi was less an invention than a rediscovery, sharpened by a coach who understood exactly which problem he was trying to solve and had the player to solve it with.