 Complete the following phrase:  A highly unconventional formation, the 460 is an evolution of the 4231 or 433 in which the centre forward is exchanged for a player who normally plays as a trequartista that is, in the hole. Suggested as a possible formation for the future of football, the formation sacrifices an out-and-out striker for the tactical advantage of a mobile front four attacking from a position that the opposition defenders cannot mark without being pulled out of position. Because of the intelligence and pace required by the front four attackers to create and attack any space left by the opposition defenders, however, the formation requires a very skilful and well-drilled front four. Due to these demanding requirements from the attackers, and the novelty of playing without a proper goalscorer, the formation has been adopted by very few teams, and rarely consistently. As with the development of many formations, the origins and originators are uncertain, but arguably the first reference to a professional team adopting a similar formation is Anghel Iordănescus Romania in the 1994 World Cup Round of 16, when Romania won 32 against Argentina. The first team to adopt the formation systematically was Luciano Spallettis Roma side during the 200506 Serie A season, mostly out of necessity as his strikerless formation, and then notably by Alex Fergusons Manchester United side that won the Premier League and Champions League in 200708. The formation was unsuccessfully used by Craig Leveins Scotland against Czech Republic to widespread condemnation. At Euro 2012, Spain coach Vicente del Bosque used the 460 for his sides 11 group stage draw against Italy and their 40 win versus Italy in the 