That's the Game(1977)

Original title: Такая она игра

A conflict between the football team's coach and its best players, Bushuev and Milenkov, led to the players leaving the team. Milenkov returned to the research institute, while Bushuev moved to a provincial town, became a coach, and, basing his training on a scientific approach to the game, achieved great success in a short period of time...