 Complete the following phrase:  Manager Ferruccio Valcareggi also used tactics inspired by the Italian catenaccio system, which was popularised by Inter manager Herrera during the 1960s, with the Italian national team, employing a sweeper behind two manmarking central defenders and a full-back, as well as a strategy which made use of heavy defending, focussing predomitly on stability, grinding out results while conceding few goals and defending narrow leads; although his tactics were controversial  in particular as during the 1970 World Cup in Mexico, he devised his infamous staffetta relay policy of playing one of his two star playmakers, Sandro Mazzola and Gianni Rivera, in each half, to avoid offsetting the defensive balance within his team  and not particularly exciting, they proved to be effective. Moreover, although at times he drew criticism in the Italian media over Italys dull, slow gameplay and lack of goals, Italy also demonstrated their offensive capabilities throughout the tournament, as well as their technical capabilities, which enabled them to conserve energy and cope with the altitude in Mexico. He had a successful spell as Italys manager, winning 