BO 1 can make the competition process shorter and more exciting, and of course it can also save some expenses for the organizing Committee (shortening the schedule and reducing some costs), but it also increases the contingency, which can not fully reflect the strength of the players and has a greater chance of surprise.
There are BO3 (best of three games), BO5, BO7, BO9 and so on.
There is BO39 in the World Snooker Championships. Since 1980, BO35 has been adopted uniformly in snooker, that is, 35 matches 18 wins.
Double-loss elimination system (as opposed to single-loss elimination system) is a form of competition, which is different from ordinary elimination system. Only by losing two games can the contestants lose the possibility of winning the championship.
The double-loss elimination system is generally divided into two groups, the winner group and the loser group. After the first round of competition, the winner belongs to the winner group and the loser belongs to the loser group to continue the competition. After each round, the losers in the loser group will be eliminated; The situation of the winner group is similar, except that the loser is only eliminated from the winner group and becomes a loser group. After failing again in the loser group (that is, there are always two failures), he will be eliminated from the whole game.
Similar to the common single-loss elimination system, the common double-loss elimination system also has 2-power contestants (for example, 4,8, 16) to ensure an even number of contestants in each round. Each round of loser competition is divided into two stages.
In the first stage, the survivors in the current loser group play against each other, the losers are eliminated, and the winners enter the second stage;
In the second stage, the winner of the loser group in the first stage plays against the player who has just been eliminated from the winner group in this round.
Take the 8-player lose-lose elimination tournament as an example:
First round competition
After four games, four players from each team were assigned to the winner group or the loser group according to the results.
Second round competition
Four players in the winner group compete with each other, and the loser belongs to the loser group.
In the first stage, the losers competed with each other and eliminated two players.
The remaining two players entered the second stage and competed with the two players who had just been eliminated from the winner group to the loser group, and the two winners entered the third round.
The third round (that is, the loser team final)
The remaining two players in the loser group were eliminated in the first stage 1.
The rest 1 enters the second stage, against the loser of the winner's final.
The winner of the loser final (only lost 1 game here) will compete with the winner of the winner final (never lost here) for the final championship.
In the final between the winner and the loser, there are two possibilities: in some competitions, it is stipulated that either side will win the final championship; However, in some competitions, it is stipulated that if the losing party wins the first place, it is necessary to play overtime to decide the final champion because both of them have lost in total. This competition system is also known as the complete lose-lose elimination system. merits and demerits
One advantage of the double-loss elimination system over the single-loss elimination system is that the third and fourth places can be determined without extra comfort or ranking.
disadvantaged
The main disadvantage of the double-loss elimination system is that the number of matches is much higher than that of the single-loss elimination system. Because the contestants will be eliminated if they lose two games, it takes 2*N- 1 (or 2*N-2) games to decide the champion for a game with n contestants.
Another disadvantage is that the winner may lose only one game in the final, but he lost the championship. However, it is generally believed that this result is acceptable, because the first place in the winner group plays a few games less than the first place in the loser group, which is equivalent to several rounds of bye. One of the ways to make up for it is to completely lose and eliminate, and then decide the champion in one game.
Another small disadvantage is that the double-loss elimination system is complicated, which may be difficult for the first-time contestants to understand. For example, there are many competitions that adopt the double-loss elimination system, especially chess competitions, such as the Toyo Securities Cup in Go and the original Robust Cup. Most international e-sports (such as professional e-sports leagues) also adopt the double-loss elimination system in the rematch stage. There are also many games that use the single-loss system. For example, some cups are in the first 16, and the first eight are followed by a single defeat system.