The participating athletes (or teams) take turns to compete once, which is a single round robin. Because athletes (or teams) have more opportunities to participate in the round robin, which is conducive to learning from each other and improving together, they can be more accurate and famous. However, the number of venues in the round robin is large, the competition time is long, and the number of venues used is also large, so the number of people (or teams) in the round robin should not be too large. When there are too many people (or teams), the method of group round robin can be adopted. When the group round robin system is adopted, it is generally appropriate to take 4-6 people (or teams) as a group.
1. Number of rounds and games
In the round robin, each athlete (or team) plays once, which is called "one round". When the number of people (or teams) is even, the number of rounds = number of people (or teams)-1; When the number of people (or teams) is odd, the number of rounds = number of people (or teams). Number of people (or teams) * [Number of people (or teams)-1]
Number of fields =-
2. Determination of sequence
One or more groups of fields adopt "1 counterclockwise rotation with fixed position". If there are athletes (teams) from the same unit in the group, the competition will be held first. Counter-clockwise rotation method is:
The position 1 is fixed, and the other positions are rotated one position counterclockwise in each round, so that the order of the next round can be discharged.
Example: arrangement for 6 people (or teams) to participate in the competition:
The first, second, third, fourth and fifth rounds.
1-6 1-5 1-4 1-3 1-2
2-5 6-4 5-3 4-2 3-6
3-4 2-3 6-2 5-6 4-5
When the number of people (or teams) is odd, use "0" to make an even number, and then rotate counterclockwise to discharge the order of each round. Among them, "0" is bye.
3. Method of determining ranking
3. 1 Ranked by the number of wins.
3.2 If two (pairs of) athletes win the same competition, the winner of the competition between them will win the first place.
3.3 If three (teams) or more than three (pairs) athletes have the same competition results, they will be ranked according to the number of net wins in their group.
3.4 After calculating the net wins, if the net wins of two athletes (pairs) remain equal, the winner of the competition between them will be the first.
3.5 After calculating the net wins, if three or more athletes (pairs) have the same net wins, they will be ranked according to the score of the net wins in this group.
3.6 After calculating the net winning scores, if the net winning scores of two athletes (pairs) remain equal, the winner of the competition between them will be the first.
3.7 If there are three (pairs) or more athletes with equal net winning points, the ranking will be decided by drawing lots.
3.8 According to the above method, the results of team competitions are calculated in the order of victory, bureau, bureau and points.
4. Group round robin and seed distribution
In the case of a large number of participants (or teams), in order not to increase the number of games and extend the date of the game, but also to arrange the rankings of each team, the group round robin is often used. After the number of groups is determined, they can be grouped by drawing lots or "snake arrangement". For example, if 16 teams in the team competition are divided into four groups, they will be grouped according to the following table:
The first group l, 8, 9, 16
Group 2, 7, 10, 15.
Group 3, 6, 1 1, 14.
Group 4, 5, 12, 13.
The figures in the above table are the serial numbers of each team, arranged according to their strength. In other words, the smaller the number, the stronger the strength, and the number on the number is equivalent to the ranking of the team.
When drawing lots for grouping, if the above 16 team is still taken as an example, four or eight seeds should be determined first, and the seeds should be arranged in order, and then grouped according to the above "snake arrangement method" or "lottery method". Finally, the unseeded teams were assigned to each group by drawing lots. Jane Eyre Badminton Network provides www.yumaoclub.com.
Second, the single knockout
Athletes (or teams) are played by two adjacent athletes (or teams) according to the arranged competition order. The loser is eliminated, and the winner enters the next round of competition until he is eliminated as the last scenic spot (or team)-the champion, and the competition is over.
In the knockout stage, 1/2 athletes (or teams) are eliminated in one round, which can reduce the number of competitions. Therefore, in the case of short time and few venues, more athletes (or teams) can participate in a single knockout stage, and the competition can gradually reach a climax, and each round is more intense. According to the characteristics of sports competition, elimination system is a better way of competition. However, because they were eliminated after losing a game, most athletes or teams (especially the weaker ones) had fewer opportunities to participate in the competition, and the resulting ranking was not reasonable.
1. Number of rounds and games
The number of rounds in a single elimination match is equal to or greater than the power index 2 closest to the number of athletes (teams), and the number of rounds is 2. Number of games = number of people (team)-1
2. Distribution of bye positions
When the number of participants (teams) is 4, 8, 16, 32, 64 or the larger power index is 2, a two-person match shall be conducted in the order of the match.
When the number of participants (teams) is not a power exponent of 2, there should be a bye in the first round. The bye number is equal to the difference between the next larger power exponent 2 and the number of people (teams) in the game. When the bye number is even, it should be evenly distributed in different areas of the competition diagram: 1/2, 1/4, 1/8 and1/6 (see the attached table for seed position and bye position). If the bye position is odd, the upper part should have one more bye than the lower part.
Example: 9 units participated in the competition, and the bye number was16-9 = 7; Bye-bye for the lower part 3 and bye-bye for the upper part 4. In this way, there is only one game in the first round. As shown in the figure below.
5-person (team) competition, lower half 1 bye, upper half 2 bye.
6-person (team) competition, L bye in the upper half and L bye in the lower half;
Seven-a-side (team) competition, L bye in the upper half.
8-person (team) competition, goodbye;
9-person (team) competition, 3 bye-bye in the lower half and 4 bye-bye in the upper half;
10 people (team) competition, 3 bye in the upper half and 3 bye in the lower half;
1 1 person (team) competition, 2 bye in the lower half and 3 bye in the upper half.
12 person (team) competition, 2 bye in the upper half and 2 bye in the lower half;
13 person (team) competition, lower half 1 bye, upper half 2 bye.
14 person (team) competition, L bye in the upper half and1bye in the lower half;
15 people (team) competition, L bye in the upper half.
More people (teams), and so on.
When there are less than 64 people (teams), the bye positions should be evenly distributed to 8 different 1/8 zones. When there are more than 65 people (teams), the bye positions should be evenly distributed in different116 areas.