Application Analysis Of Video Assistant Referee System In The 21st World Cup

1Objective: Football is the world's largest sport because of its high appreciation,the uncertainty of the results of the game and other factors such as the ups and downs of the attack and defense against both sides of the game,resulting in more and more people contact football,like football,focus on football.Since the birth of modern football in England in 1868,after more than a century of development,modern football has developed into a new mode of full attack and full defense,team cooperation has become more and more important,the overall attack speed has become faster,and the number of people involved in attack and defense has become more and more.In this way,it will bring a lot of difficulties to the referee of the football match.In most cases,the referee,without the help of high-tech means,is likely to make a wrong judgment on the key penalties,resulting in a change in the results of the game.For the sake of ensuring the fairness and fairness of the football match and preventing the appearance of "false and false ball ",the " cool techs " ——video assistant referee technology on the football field came into being in the 21 st century.2 Methods: Using the methods of literature,video observation,mathematical statistics,logic analysis,case analysis and expert interview,the paper studied the application of video assistant referee system in 64 games of the 21 st World Cup inRussia in 2018,including 1/8 final,1/4 final,semi-final and final.By watching the video of the match,the data statistics and mathematical analysis were used to study the use of video assistant referee system in the 21 st World Cup.the impact of the future development direction of football,at the same time point out the shortcomings of the current video assistant referee system itself and the use of defects,and point out reasonable suggestions.3 Fruit:(1)Video Assistant referee system in the 21 st World Cup penalty accuracy increased to 99.35%,can effectively improve the accuracy of the penalty.(2)The video assistant referee system is mainly used in the restricted area of the football field,mainly in the second half of the game.(3)It takes more time to go back to the scene than to decide the penalty with VAR information.The average time spent per VAR is a small percentage of dead time,and the 2018 World Cup is longer than the 2014 World Cup.(4)Compared with the last five World Cup,the number of yellow cards awarded for malicious fouls or other improper acts has increased,and the number of red cards decreased,but the number of penalty penalties has exceeded that of any previous World Cup.(5)The video assistant referee system will have a certain impact on football,including the direction of football development,game results,technical and tactical training.(6)At present,the video assistant referee system still has some problems,such as timing of intervention,high cost,influence of competition fluency and appreciation.