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High-level coaches are definitely good. For example, in the last European Cup, Russia led by Hiddink won the historical runner-up and South Korea entered the semi-finals in 2002. The case of failure is that the French team led by Domenech didn't win a game in this World Cup and only scored one goal. This is because there are many factors that affect the level of football. For example, Du Yi, the top ten coach, came to coach, and China played like that because of gambling.
In France, the French Football Association recently issued a fine for players.
Sometimes the referee who collects black money will also affect the game, but it will not affect the level of the players.
Ask again if you have questions.