What is the competition system of various sports competitions? Have a plenty of best of five games. ...

There are two basic competition systems in sports competitions, round robin and knockout, and other competition systems are developed on these two basic competition systems. Generally speaking, every opponent has to make a move in the round robin, and every game may be accidental. Generally speaking, the probability tends to be balanced, which partly eliminates the contingency, but the disadvantage is that the game time is too long. The knockout stage is allocated by lottery, and the winner is promoted and the loser is out, which is quite accidental, but the competition efficiency is high. Generally speaking, there are few contestants or time permits, and the round robin system is adopted, such as national leagues; When there are many people, it is often faster to use knockout matches, such as the four major open tennis tournaments, small ball matches or world cups. However, due to the time limit of one month, considering the inevitability and contingency, the competition system like the football World Cup is divided into groups and then eliminated. In the knockout stage, the losers have an extra chance, that is, the losers can still compete with each other, and the winner between the two can still keep the chance of promotion. Called the double elimination stage, such as the page system of baseball and softball games, it is a variant of the double elimination stage. Of course, the so-called "resurrection match" in the draft competition is quite similar to this. No matter what kind of competition, the organizers try their best to make the competition more exciting and arouse the enthusiasm of the contestants. It is necessary to maintain a certain contingency, create an upset, and have a certain inevitability, so that the ultimate king can live up to its name. For example, the Football Association Cup in England has always been called an "unpopular hotbed" to attract audiences. However, the whole of England is still proud of the league title, and the home and away round robin is of course genuine and more powerful. Obviously, the NBA has taken another road to eliminate contingency as much as possible, not only in round robin, but also in home and away games. At the same time, the result of the regular season determines the number of home games in the playoffs. The playoff of the knockout stage adopts the system of best of seven games, which almost curbs the contingency, but the fact that the championship has become very good also increases the chances of each team making mistakes, which will not be a long-term regret. After the game, refer to our life and compare it to a sports field. What should this playground do?