Analysis And Research On Offensive And Defensive Capabilities Of Csl Teams In 2019 And 2020 Seasons In The Context Of COVID-19

The Chinese Football Super League began in 2004.Although it has been controversial in the past ten years,it has been continuously self-improvement and developed so far.In the era of golden dollar football,the support of capital has increased the investment of each club.The addition of foreign players and coaches has also increased the tactical changes of each team at both attack and defense.The overall attack and defense ability of most teams has changed.Such changes can also be intuitively reflected in the ranking of the league.In 2019,as in previous years,the home and away competition system is carried out as usual,with a total of 240 games in 30 rounds.In early 2020,due to the outbreak of COVID-19,the league postponed and eventually changed its tournament system from the home-and-away system adopted in previous years to the tournament system.In the past four months,160 matches have been played in Dalian and Suzhou respectively.The change of the competition system not only puts forward new requirements on the domestic and foreign players of each club,but also requires the management and coach of the club to follow the new competition system and new regulations.To optimize the overall capability of offense and defense based on your season objectives.The methods of literature review,video observation,mathematical statistics,comparative analysis and logical analysis are used to explore the offensive and defensive technical indicators of CSL teams affected by COVID-19 in the 2020 season,and then compared with technical indicators of CSL participating teams in the2019 season,analyze and study from different point of views.Taking 16 indicators in400 games of 18 CSL teams participating in the 2019-2020 season as the study object.The study results show that:(1)The TOPSIS method can be used to analyze and study the defensive capability,offensive capability and offensive and defensive capability of CSL teams,and the results of data analysis are consistent with the actual results of the teams.(2)In the 2019 and 2020 seasons,the offensive and defensive capability of the top five CSL teams are high close to the optimal scheme of the league,while,the offensive and defensive capability of the three relegated teams are low close to the optimal scheme of the league.(3)Compared with the 2019 season,the 2020 season has changed the competition system and regulations in the context of COVID-19.The tournament made teams pay more defensive,Intensive schedule and high physical consumption affect the attack ability of each team,and the defensive tactics show advantages.which improved the overall defensive capability of the CSL teams in the 2020 season,and the defensive capability of most teams tends to be optimal value of the league.(4)Compared with 2019 season,the defensive capability of 2020 season is more relevant to the final ranking of the team,and the defensive ability of the team with higher ranking is better.(5)Under the normalization of the prevention and control of COVID-19,it was inevitable for the changes of the competition system and regulations.All teams had to adapt to the changes and reasonably arrange their physical fitness reserve and tactics.Under the condition of overcoming all kinds of factors affecting the offensive and defensive ability,the teams of CSL could achieve better results by improving their defensive ability.