Abstract
In order to compare the defensive effectiveness of football teams using tactical systems with different quantitative composition of the defensive line, the defensive effectiveness of teams from five European leagues and the Russian Premier League for 8 full seasons 2014-2022 was compared on a number of indicators (goals conceded, shots allowed on their own goal, expected goals conceded) based on electronic data resource understat.com. According to statistical analysis, tactical systems with two central defenders are more defensively effective than tactical systems with three central defenders, according to the xGa indicator (expected goals conceded). Significant differences in xGa were obtained for the English Premier League, the Spanish La Liga; differences at the trend level in xGa were obtained for the French Ligue 1 and all the championships considered in general. Further research is needed, taking into account not only the type of tactical system of the team, but also the type of the opposing team and other factors affecting the defensive effectiveness of the team.
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