For instance, if there are eight players in a score group, number 1 is paired with number 5, number 2 is paired with number 6 and so on. Subject to the other pairing rules, the top half is then paired with the bottom half. Within each group with the same or similar score, players are ranked, based on rating or some other criteria. The players are divided into groups, based on their score. The Monrad system for pairing is commonly used in chess in Denmark and Norway, as well as in other sports worldwide. In chess, a specific pairing rule, called "Dutch system" by FIDE, is often implied when the term "Swiss" is used. As they are quite complicated, and it is undesirable to have a long delay between rounds to decide the pairings, the tournament organizer often uses a computer program to do the pairing. The detailed pairing rules are different in different variations of the Swiss system. The pairing rules have to be quite complicated, as they have to ensure that no two players ever oppose each other twice, and to avoid giving a player some advantage as a result of chance. In subsequent rounds, competitors are sorted according to their cumulative scores and are assigned opponents with the same or similar score up to that point. If it is desired for top-ranked participants to meet in the last rounds, the pattern must start them in different brackets, just the same as is done in seeding of pre-ranked players for a single elimination tournament. In the first round, competitors are paired either randomly or according to some pattern that has been found to serve a given game or sport well. The system was first employed at a chess tournament in Zurich in 1895 by Julius Müller, hence the name "Swiss system", and is now used in many games including chess, go, bridge and Scrabble.ĭuring all but the first round, competitors are paired based on approximately how they have performed so far. The Swiss system seeks to provide a clear winner with a large number of competitors and a relatively small number of rounds of competition, without a single bad result terminating participation. Unlike group format or other systems in which all pairings are known from the beginning of the competition, in a Swiss system the match pairing for each round is done after the previous round has ended and depends on its results. In contrast, all-play-all is suitable if there are a small number of competitors whereas a single-elimination (knockout) tournament rapidly reduces the number of competitors, but the best competitor may not necessarily win, as good competitors might have a bad day or eliminate and exhaust each other if they meet in early rounds. The Swiss system is used for competitions in which there are too many entrants for a full round-robin (all-play-all) to be feasible, and eliminating any competitors before the end of the tournament is undesirable. With an even number of participants, all competitors play in each round. The winner is the competitor with the highest aggregate points earned in all rounds. Competitors meet one-on-one in each round and are paired using a set of rules designed to ensure that each competitor plays opponents with a similar running score, but does not play the same opponent more than once. Non-eliminating tournament format, without playing every competitorĪ Swiss-system tournament is a non-eliminating tournament format that features a fixed number of rounds of competition, but considerably fewer than for a round-robin tournament thus each competitor (team or individual) does not play all the other competitors.
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