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Gian Piero Gasperini proved to be intelligent because he was able to read the tactics used by Xabi Alonso and Jurgen Kloop when other coaches had difficulty reading Xabi Alonso's tactics. He was able to read them and made his club perform extraordinary by scoring 3 goals with only relying on 1 player and Leverkusen seemed to have difficulty keeping up. Atalanta's game, even Leverkusen's shot did not result in a goal, while Atalanta was able to turn it into a goal, it is said that the coach's tactics were very effective.
Their success can be measured in different ways, but each coach has unique strengths and accomplishments. At the highest level of football, it's a competition about who has the best playing style and who can adapt tactics under pressure. Gian Piero Gasperini has shown he can decode opponents' tactics and defend against them. He is an underrated manager, consistently keeping Atalanta competitive with minimal resources.
Leverkusen struggled to keep up with Atalanta's game. Their style of play seemed to fade. Winning a game involves some luck, but consistent success is no fluke. Atalanta's coach managed the game well until the end and outperformed Xabi Alonso.