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59-497: On February 14, 2019, OverActive Media, in partnership with esports team Mirage Sport Électronique, formally announced Toronto Defiant's academy team as "Montreal Rebellion". They began in Overwatch Contenders North America East and revealed their 2019 Season 1 roster, led by head coach Chris "Dream" Myrick. In their first season of play, Rebellion finished 2–5 in the regular season and claimed

118-463: A bye . The schedule can therefore be computed as though the dummy were an ordinary player, either fixed or rotating. Instead of rotating one position, any number relatively prime to ( n − 1 ) {\displaystyle (n-1)} will generate a complete schedule. The upper and lower rows can indicate home/away in sports, white/black in chess , etc.; to ensure fairness, this must alternate between rounds since competitor 1

177-464: A bye. If the number is even, an added player (ω) becomes the opponent. For an even number n {\displaystyle n} or an odd number n − 1 {\displaystyle n-1} of competitors, Schurig builds a table with n / 2 {\displaystyle n/2} vertical rows and n − 1 {\displaystyle n-1} horizontal rows. Then he populates it starting from

236-411: A competitor to play the strongest opponents in a round robin in quick succession while others play them intermittently with weaker opposition. This asymmetry means that playing the same opponents is not necessarily completely equitable. There is also no scheduled showcase final match unless (by coincidence) two competitors meet in the last match of the tournament, with the result of that match determining

295-477: A competitor's chance of ultimate victory. Final records of participants are more accurate, in the sense that they represent the results over a longer period against the same opposition. The system is also better for ranking all participants, not just determining the winner. This is helpful to determine the final rank of all competitors, from strongest to weakest, for purposes of qualification for another stage or competition as well as for prize money. In team sports,

354-489: A lower-placed qualifier is perceived to be easier than for a higher-placed one). Four pairs in the 2012 Olympics Women's doubles badminton , having qualified for the next round, were ejected from the competition for attempting to lose in the round robin stage to avoid compatriots and better ranked opponents. The round robin stage at the Olympics was a new introduction, and these potential problems were readily known prior to

413-516: A one-day notice to the player's current team before doing so. Should the OWL team decide to sign a Contenders player, the OWL team may have to pay a one-time buyout fee to the Contenders team, which is up to 100% of the players annual base salary. Contenders teams and their affiliate OWL team have "right-to-match" clauses, which will allow the parent team to match any other OWL offer within seven days of

472-437: A round in which players meets each other. For example, player 7 plays against player 11 in round 4. If a player meets itself, then this shows a bye or a game against player n. All games in a round constitutes a diagonal in the table. The above schedule can also be represented by a graph, as shown below: Both the graph and the schedule were reported by Édouard Lucas in as a recreational mathematics puzzle. Lucas, who describes

531-497: A round, a non-leftmost position (not including 1 {\displaystyle 1} ) can only be taken by competitors of a fixed distance. In round 1 {\displaystyle 1} of the example, in the second position competitor 2 {\displaystyle 2} plays against 13 {\displaystyle 13} , their distance is 2 {\displaystyle 2} . In round 2 {\displaystyle 2} , this position

590-540: A schedule where player 14 has a fixed position, and all other players are rotated counterclockwise n 2 {\displaystyle {\frac {n}{2}}} positions. This schedule is easily generated manually. To construct the next round, the last player, number 8 in the first round, moves to the head of the table, followed by player 9 against player 7, player 10 against 6, until player 1 against player 2. Arithmetically, this equates to adding n 2 {\displaystyle {\frac {n}{2}}} to

649-619: A straight knockout system. The top one, two, or occasionally three teams in these groups then proceed to a straight knockout stage for the remainder of the tournament. In the circle of death it is possible that no champion emerges from a round-robin tournament, even if there is no draw, but most sports have tie-breaker systems which resolve this. Round-robins can suffer from being too long compared to other tournament types, and with later scheduled games potentially not having any substantial meaning. They may also require tie-breaking procedures. Swiss system tournaments attempt to combine elements of

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708-733: A structure to support the Overwatch League; it was divided into five divisions with 12 teams each: Korea (replacing the Overwatch Apex tournament), China (replacing the Overwatch Premier Series), and Pacific (replacing Overwatch Pacific Championship for other Asian-Pacific countries), and adding in North America and European divisions. Prior to the second 2018 Contenders season, Blizzard added two additional divisions, Australia and South America, bringing

767-526: A table. In France this is called the Carousel -Berger system (Système Rutch-Berger). The schedule can also be used for "asynchronous" round-robin tournaments where all games take place at different times (for example, because there is only one venue). The games are played from left to right in each round, and from the first round to the last. When the number of competitors is even, this schedule performs well with respect to quality and fairness measures such as

826-416: A tournament of 16 teams can be completed in just 4 rounds (i.e. 15 matches) in a knockout format; a double elimination tournament format requires 30 (or 31) matches, but a round-robin would require 15 rounds (i.e. 120 matches) to finish if each competitor faces each other once. Other issues stem from the difference between the theoretical fairness of the round robin format and practice in a real event. Since

885-571: A variety of tiebreaker criteria. Frequently, pool stages within a wider tournament are conducted on a round-robin basis. Examples with single round-robin scheduling include the FIFA World Cup , UEFA European Football Championship , and UEFA Cup (2004–2009) in football, Super Rugby ( rugby union ) in the Southern Hemisphere during its past iterations as Super 12 and Super 14 (but not in its later 15- and 18-team formats),

944-613: Is a simple algorithm to create a schedule for a round-robin tournament. All competitors are assigned to numbers, and then paired in the first round: Next, one of the competitors in the first or last column of the table is fixed (number one in this example) and the others rotated clockwise one position: This is repeated until when the next iteration would lead back to the initial pairings: With an even number n {\displaystyle n} of competitors this algorithm realizes every possible combination of them (equivalently, that all pairs realized are pairwise different). First,

1003-435: Is always on the first row. If, say, competitors 3 and 8 were unable to fulfil their fixture in the third round, it would need to be rescheduled outside the other rounds, since both competitors would already be facing other opponents in those rounds. More complex scheduling constraints may require more complex algorithms. This schedule is applied in chess and draughts tournaments of rapid games, where players physically move round

1062-626: Is determined by which team win three maps first until the Grand Finals, which is first-to-four. The top four teams from Playoffs move on to the next season's Contenders Week 1, while the bottom four teams drop to the next season's Trials Week 1. Additionally, the top performers in each regional playoff has the chance to qualify for international events. Since 2019, the top teams from the Pacific and Atlantic Conference in each year's first season have competed in double-elimination tournaments, called

1121-905: Is divided into two conferences, the Atlantic Conference and the Pacific Conferences. Each division is divided into a total of seven regions; the Pacific Division consists of the Australia, China, Korea, and Pacific regions, and the Atlantic Division consists of the Europe, North America, and South America regions. Each region is broken down into three divisions: Additionally, each region's promotion and relegation into several phases: Points are awarded only in Contenders and are based on placements in

1180-691: Is even, then in each of ( n − 1 ) {\displaystyle (n-1)} rounds, n 2 {\displaystyle {\begin{matrix}{\frac {n}{2}}\end{matrix}}} games can be run concurrently, provided there exist sufficient resources (e.g. courts for a tennis tournament). If n {\displaystyle n} is odd, there will be n {\displaystyle n} rounds, each with n − 1 2 {\displaystyle {\begin{matrix}{\frac {n-1}{2}}\end{matrix}}} games, and one competitor having no game in that round. The circle method

1239-1054: Is held by competitors 14 {\displaystyle 14} and 12 {\displaystyle 12} , also having distance 2 {\displaystyle 2} , etc. Similarly, the next position ( 3 {\displaystyle 3} against 12 {\displaystyle 12} in round 1 {\displaystyle 1} , 2 {\displaystyle 2} against 11 {\displaystyle 11} in round 2 {\displaystyle 2} , etc.) can only hold distance- 4 {\displaystyle 4} competitors. For every k < n 2 {\displaystyle k<{\frac {n}{2}}} , there are exactly n − 1 {\displaystyle n-1} pairs of distance k {\displaystyle k} . There are n − 1 {\displaystyle n-1} rounds and they all realize one distance- k {\displaystyle k} pair at

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1298-471: Is no limit to how many players may be signed to a team, all Contenders teams may have only eight players designated as eligible to compete in a given week. The minimum age to play in Contenders is 13, except in the China region, where the minimum age is 16. In 2018, the Overwatch League allowed OWL teams to sign up to four players to two-way contracts with their associated academy team. A maximum of four of

1357-408: Is the fairest way to determine the champion from among a known and fixed number of contestants. Each contestant, whether player or team, has equal chances against all other opponents because there is no prior seeding of contestants that will preclude a match between any given pair. The element of luck is seen to be reduced as compared to a knockout system since one or two bad performances need not ruin

1416-574: The 2025 ICC Champions Trophy . In a more extreme example, the KBO League in baseball plays a 16-fold round robin, with each of the 10 teams playing each other 16 times for a total of 144 games per team. LIDOM (Baseball Winter League in the Dominican Republic) plays an 18-fold round robin as a semi final tournament between four classified teams. Group tournaments rankings usually go by number of matches won and drawn, with any of

1475-656: The Cricket World Cup along with Indian Premier League , major Twenty-20 Cricket tournament, and many American football college conferences , such as the Conference USA (which currently has 9 members). The group phases of the UEFA club competitions and Copa Libertadores are contested as a double round-robin, as are most basketball leagues outside the United States, including the regular season of

1534-536: The EuroLeague (as well as its former Top 16 phase); the United Football League has used a double round-robin for both its 2009 and 2010 seasons. Season ending tennis tournaments also use a round robin format prior to the semi on stages. The champion in a round-robin tournament is the contestant that wins the most games, except when draws are possible. In theory, a round-robin tournament

1593-446: The OWL team's roster limit and OWC team's roster limit. In addition, two-way players had to be paid the same minimum salary ($ 50,000 as of 2018) and benefits as any other Overwatch League player. In August 2020, the OWL removed the limit on the number of players that a team could have on a two-way contract. Any Overwatch League team may contact, tryout, and sign any player competing in Contenders during specified periods, but must give

1652-599: The Pacific Showdown and Atlantic Showdown, respectively. Similarly, at the end of each year's second season, the top teams from the every region compete in The Gauntlet, which consists of group stages culminating in a double-elimination tournament. Ownership models vary across Overwatch Contenders. Any team that moves from the Open Division to Contenders Trials must have a proper team owner; that is,

1711-446: The algorithm obviously realizes every pair of competitors if one of them equals 1 {\displaystyle 1} (the non-moving competitor). Next, for pairs of non- 1 {\displaystyle 1} competitors, let their distance be the number k < n 2 {\displaystyle k<{\frac {n}{2}}} of times the rotation has to be carried out in order that one competitor arrives at

1770-540: The amount of rest between games. On the other hand, when the number of competitors is odd, it does not perform so well and a different schedule is superior with respect to these measures. Alternatively Berger tables, named after the Austrian chess master Johann Berger , are widely used in the planning of tournaments. Berger published the pairing tables in his two Schach-Jahrbücher (Chess Annals), with due reference to its inventor Richard Schurig. This constitutes

1829-435: The championship. A notable instance of such an event was the 1950 FIFA World Cup match between Uruguay and Brazil . Further issues arise where a round-robin is used as a qualifying round within a larger tournament. A competitor already qualified for the next stage before its last game may either not try hard (in order to conserve resources for the next phase) or even deliberately lose (if the scheduled next-phase opponent for

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1888-570: The end of the Overwatch League. The Contenders league was launched in 2017 to be a developmental league for players aspiring to play in the Overwatch League , with regions in North America and Europe. Teams competed in an online open qualifier known as 2017 Season Zero, where the top eight teams from Europe, the top six teams from North America, and invited teams Team Envy and Rogue would compete in 2017 Season 1. In 2018, Blizzard merged Contenders with existing regional tournaments into

1947-463: The final playoff spot by finishing in sixth place. They defeated third-seeded Second Wind 3–1 in the quarterfinals before losing to two-seed and eventual champions Fusion University ( Philadelphia Fusion 's academy team). After the season, the team mutually parted ways with head coach Dream and announced Matthew "Optidox" Sims, who had led Angry Titans to the 2019 Season 1 EU championship, as the new head coach. Prior to 2019 Season 2, Montreal Rebellion

2006-577: The major North American professional sports leagues. In the United Kingdom , a round-robin tournament has been called an American tournament in sports such as tennis or billiards which usually have single-elimination (or "knockout") tournaments, although this is now rarely done. A round-robin tournament with four players is sometimes called "quad" or "foursome". In sports with a large number of competitive matches per season, double round-robins are common. Most association football leagues in

2065-403: The method as simple and ingenious , attributes the solution to Felix Walecki, a teacher at Lycée Condorcet . Lucas also included an alternative solution by means of a sliding puzzle . To easily remember this method, the following mnemonic can be used. Starting from the first round, the next round is constructed: and then, If the number of players is odd, the player in the first venue gets

2124-557: The number of teams in each region to eight, while dividing the North American region into East and West divisions. Blizzard also added a regional limit of the number of "import players", which are those that live outside the division's region, to a maximum of three. Blizzard made several changes for Contenders for the 2020 year after the rise of the COVID-19 pandemic . The North America East and West regions were merged back into

2183-494: The offer being made. Round-robin tournament A round-robin tournament or all-play-all tournament is a competition format in which each contestant meets every other participant, usually in turn. A round-robin contrasts with an elimination tournament , wherein participants are eliminated after a certain number of wins or losses. The term round-robin is derived from the French term ruban ('ribbon'). Over time,

2242-420: The owner must not be player or by an individual acting as a proxy for a player. Contenders teams may be affiliated with an OWL team, known as an "academy team", and players can be freely moved between these affiliated teams during set periods of each OWL season. As such, there are three main models for ownership of a Contenders team: OWL affiliates, third-party sponsored teams, and unsigned rosters. While there

2301-496: The position the other had. In the example given ( n = 14 {\displaystyle n=14} ), 2 {\displaystyle 2} has distance 1 {\displaystyle 1} to 3 {\displaystyle 3} and to 14 {\displaystyle 14} and it has distance 6 {\displaystyle 6} to 8 {\displaystyle 8} and to 9 {\displaystyle 9} . In

2360-400: The previous row, with the exception of player n {\displaystyle n} . When the result of the addition is greater than ( n − 1 ) {\displaystyle (n-1)} , then subtract ( n − 1 ) {\displaystyle (n-1)} from the sum. This schedule can also be represented as a (n-1, n-1) table, expressing

2419-484: The previous season. After two weeks of the 2020 season, Rebellion quietly disbanded without an official announcement, reportedly due to budget cuts amidst the COVID-19 pandemic . Latest roster transaction: March 19, 2020. All Overwatch Contenders players are eligible to be promoted by their affiliated Overwatch League team or signed to any other Overwatch League during specified non-blackout periods. Overwatch Contenders Overwatch Contenders ( OWC )

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2478-406: The round-robin and elimination formats, to provide a worthy champion using fewer rounds than a round-robin, while allowing draws and losses. The main disadvantage of a round robin tournament is the time needed to complete it. Unlike a knockout tournament where half of the participants are eliminated after each round, a round robin requires one round less than the number of participants. For instance,

2537-525: The round-robin major league champions are generally regarded as the "best" team in the land, rather than the cup winners, whose tournaments usually follow a single-elimination format. Moreover, in tournaments such as the FIFA or ICC World Cups, a first round stage consisting of a number of mini round robins between groups of 4 teams guards against the possibility of a team travelling possibly thousands of miles only to be eliminated after just one poor performance in

2596-408: The same position. Clearly, these pairs are pairwise different. The conclusion is that every distance- k {\displaystyle k} pair is realized. This holds for every k {\displaystyle k} , hence, every pair is realized. If there are an odd number of competitors, a dummy competitor can be added, whose scheduled opponent in a given round does not play and has

2655-460: The single North America region, reducing the total amount of regions back to seven, and the Atlantic and Pacific Divisions were renamed to the Atlantic and Pacific Conferences. Aside from China, the regional player restrictions was also reverted, now allowing any number of players from any region to be on a team in any region. The number of two-way players allowed to compete on a given day for a team

2714-422: The standard "league" format used in previous seasons, North America and Europe shifting to monthly tournaments, South America shifting to a hybrid format between the two, and China making no changes. Additionally, the Pacific region of Contenders was cancelled; Blizzard committed US$ 100,000 to "exploring ways to build a unique experience for Pacific players" in the region. In February 2021, South America Contenders

2773-608: The teams. This famously happened during the 1994 FIFA World Cup Group E , where all four teams finished with a record of one win, one draw, and one loss. This phenomenon is analogous to the Condorcet paradox in voting theory. If n {\displaystyle n} is the number of competitors, a pure round robin tournament requires n 2 ( n − 1 ) {\displaystyle {\begin{matrix}{\frac {n}{2}}\end{matrix}}(n-1)} games. If n {\displaystyle n}

2832-417: The term became idiomized to robin . In a single round-robin schedule, each participant plays every other participant once. If each participant plays all others twice, this is frequently called a double round-robin . The term is rarely used when all participants play one another more than twice, and is never used when one participant plays others an unequal number of times, as is the case in almost all of

2891-482: The top teams from the 2021 season being directly invited to the first event of the year without needing to qualify. On January 23, 2024, Blizzard announced that the Overwatch League and Contenders had officially folded; on the same day, they would announce a multi-year deal with ESL FACEIT Group and WDG Esports to create the Overwatch Champions Series (OWCS) to replace the OWL. The league

2950-486: The total to seven. Further, Blizzard gave the opportunity to the top eight teams from the Open Division within each region to compete in Contenders Trials, which would be held at the end of each Contenders season; the qualified teams would take place in a promotion-relegation tournament for the chance to compete in the next Contenders season. For its second year in 2019, Blizzard adjusted the format by reducing

3009-505: The tournament. First place is awarded 100 points, second is awarded 50 points, third and fourth are awarded 25 points, fifth through eighth are awarded 20 points, and ninth through twelfth are awarded 10 points. Each region's playoffs, known as the Contenders Playoffs, is a double-elimination tournament . The top eight teams, based on points, from each region will qualify for their region's playoffs. Each playoff match winner

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3068-435: The tournament; changes were made prior to the next Olympics to prevent a repeat of these events. Another disadvantage, especially in smaller round-robins, is the "circle of death", where teams cannot be separated on a head-to-head record. In a three-team round-robin, where A defeats B, B defeats C, and C defeats A, all three competitors will have a record of one win and one loss, and a tiebreaker will need to be used to separate

3127-405: The two-way players could play in a single Contenders match, and a two-way player could not play in a Contenders match and Overwatch League match in the same week. These players would spend the majority of their time on a team's Contenders roster, but could freely move to their respective OWL team for up to two matches in any stage of regular season. Players under two-way contracts counted against both

3186-451: The victor is gradually arrived at through multiple rounds of play, teams who perform poorly, who might have been quickly eliminated from title contention, are forced to play out their remaining games. Thus games are played late in the competition between competitors with no remaining chance of success. Moreover, some later matches will pair one competitor who has something left to play for against another who does not. It may also be possible for

3245-814: The world are organized on a double round-robin basis, in which every team plays all others in its league once at home and once away. This system is also used in qualification for major tournaments such as the FIFA World Cup and the continental tournaments (e.g. UEFA European Championship , CONCACAF Gold Cup , AFC Asian Cup , CONMEBOL Copa América and CAF Cup of Nations ). There are also round-robin cricket , bridge , chess , draughts , go , ice hockey , curling , and Scrabble tournaments. The World Chess Championship decided in 2005 and in 2007 on an eight-player double round-robin tournament where each player faces every other player once as white and once as black. There has been several major international cricket tournaments held in this format including ICC events, including

3304-526: Was an international esports league for the video game Overwatch that is organized by Blizzard Entertainment . The series acts as the development league for aspiring Overwatch League (OWL) professionals. Founded in 2017, Contenders was created in part to consolidate existing regional tournaments into a structure to support the Overwatch League, including the Overwatch Apex tournament, Overwatch Premier Series, and Overwatch Pacific Championship. Overwatch Contenders ceased operations in 2024, coinciding with

3363-481: Was cancelled, leaving only five regions. Teams in South America, as well as the previously cancelled Pacific, would be able to qualify for international Contenders tournaments via third-party tournaments in their respective regions. For the 2022 year, Overwatch Contenders, along with the Overwatch League, will be played on a beta build of Overwatch 2 . It will also shift to an open-registration format, with

3422-468: Was increased from two to four. Blizzard also made a major format change for 2020 year. The qualification to make regional playoffs was changed from a round-robin format to a point system, which includes four Contenders tournaments that will dictate the number of points a team earns based on their finishing place. After the first half of the 2020 season, Overwatch Contenders adjusted the structure of each region, with South Korea and Australia reverting back to

3481-607: Was moved to the North America West region. Part way through the season, Optidox left the team to become an assistant coach (and subsequently interim co-head coach) for the Toronto Defiant. Jesse "Jsr" Rangi was subsequently named head coach and finished out the season with the Rebellion. They finished in fifth place with a 4–3 record, though they were defeated by Second Wind, 3–1, in a quarterfinals rematch from

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