Teams or athletes take turns to compete once, which is called single round robin. This method can make the participating teams or athletes have the opportunity to participate in the competition, and can determine the ranking of the teams or athletes more accurately. However, the number of single round robin is large, the competition time is long, and more venues and equipment are needed, so the number of teams or people participating in single round robin should not be too large, otherwise group round robin should be adopted.
(1) Calculation method of single round robin ranking: According to the international competition rules, 2 points will be scored for winning a game, 1 point will be scored for losing a game, and 0 point will be scored for the games that have not been played or have not been finished. The ranking of the group will be determined according to the number of games won. If two or more teams in a group have the same score, they should be ranked according to the results of their corresponding games. First, the game scores obtained between them will be calculated, and then the number of times of a single game will be calculated as needed.
(2) Group round robin: Although single round robin can rank all teams (or people) correctly, it is difficult to use it when there are many teams (or people), because the large number of players brings difficulties to the organization and management of the competition. In this case, group round robin can be used. The most commonly used arrangement method of group round robin is "snake arrangement", that is, the sequence numbers are arranged according to the strength of each team (usually according to the ranking of the last game). The smaller the serial number, the stronger the strength, on the contrary, the weaker the strength. When grouping, the strength of each group is required to be average, that is, the serial numbers of each group are added. In some ball games, on the basis of "snake arrangement", the seed team and the non-seed team are divided by lottery, that is, the No.65438 +0-4 team (seed team) is fixed in the No.65438 +0-4 group or entered the No.65438 +0-4 group by lottery; Then the numbers 5-8, 9- 12, 13- 16 are drawn into the 1-4 group respectively. However, after the end of the grouping period, the second stage of the competition should be added and all the rankings should be discharged. There are two common methods:
1. Competitions with the same name in each group: If the first stage is divided into four groups for group round robin, the first place in each group in the second stage is single round robin, and1-4 is decided; The second place in each group is a group, and the fifth-eighth place is decided; And so on.
2. Cross-race: In the first stage, round robin will be held in two groups. In the second stage, the top two players in each group will cross-race to decide the places such as champion, runner-up and third runner-up. In this way, the 5th-8th places are decided by 3 or 4 people in each group. 5 or 6 people in each group cross to decide No.9-12; And so on.
Second, the single knockout
Teams (or people) participating in the competition play in the order of arrangement. The winner enters the next round of competition, and the loser is eliminated until the champion is decided, which is called the single knockout. The number of single elimination matches is relatively small, which is conducive to arranging more players to participate in the competition in a short time. However, this method is unreasonable, incomplete and opportunistic, and some measures must be taken to overcome these defects in order to play its role in practical application.
(1) The number of digits selected should be a power of 2. The commonly used numbers and positions in the competition are 8, 16, 32, 64, 128, 256.
(2) detour If the number of participants is not equal to the number of times, but less than the number of times, that is, when the number of participants in the first round is less than the number of times, no athlete's ranking is called "bye" ranking.
(3) When the number of participants is slightly greater than the power of 2, the square of 2 with the closest number of participants is selected as the number of numbers, and a few participants "grab the number". Grab the number is to play a game at the same number position first, and the winner enters the number. The position of grabbing the number is the same as that of bye-bye, and "grabbing the number" is also a round.
(four) seeds (that is, strong players or excellent players)
1, setting the role of "seed" The method of setting "seed" players is to overcome the irrationality of single elimination. When drawing lots, the "seeds" are evenly distributed in each "area" so as to meet at last, and strive to ensure the rationality of determining the ranking of the competition.
2. The number of seeds The number of "seeds" is mainly determined according to the number of teams or participants. Generally, it is1/6- 12 of the number of participants, that is, a seed for a player with an average of 6-12; At the same time, the number of "seeds" should be a power of 2, such as 2, 4, 8, 16, etc.
3. The position of "seeds" should be arranged as follows: the first seed is arranged at the top of the upper half; The second seed should be arranged at the bottom of the lower half; The third and fourth seeds should be inserted at the bottom of the upper half and the top of the lower half respectively; The fifth to eighth seeds should enter the bottom of odd quarters and the top of even quarters respectively; If there are many seeds (9- 16), and so on (the seed position number can be found in the seed position table). In fact, the "seeds" of the knockout stage are evenly distributed in various "zones".