Round robin - Revision history

Kevin Wang: /* How to set up a round robin */

2022-01-24T20:01:41Z

How to set up a round robin

Kevin Wang: /* How to set up a round robin */

2022-01-24T20:00:31Z

How to set up a round robin

Kevin Wang: /* Full round robin */

2022-01-24T19:08:29Z

Full round robin

Kevin Wang: /* Full round robin */

2022-01-24T19:08:12Z

Full round robin

Kevin Wang: /* Double round robin */

2021-12-17T19:47:44Z

Double round robin

Kevin Wang: /* Full round robin */

2021-12-17T15:26:33Z

Full round robin

Kevin Wang: /* Full round robin */

2021-12-17T15:23:09Z

Full round robin

Kevin Wang: /* Considerations */

2021-12-17T15:15:36Z

Considerations

Kevin Wang: /* Triple round robin */

2021-12-17T15:13:41Z

Triple round robin

Kevin Wang: /* Triple round robin */

2021-12-16T20:59:05Z

Triple round robin

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 For an odd number of teams, use the same procedure for one more than the number of teams, and choose one team (typically team 1) to treat as a bye. Teams playing the team 1 will then get a bye.
-The simplest way to assign matches to rooms is to have the first column represent one room, the second column a second room, and so on. However, for a round robin with an even number of teams, this can be undesirable because team 1 is kept in the same room all day. There are pre-made round-robin schedules available to spread the teams evenly across rooms as much as possible (which is impossible for four teams).
+Once a complete schedule like the one above is obtained, the simplest way to assign matches to rooms is to have the first column represent one room, the second column a second room, and so on. However, for a round robin with an even number of teams, this can be undesirable because team 1 is kept in the same room all day. There are pre-made round-robin schedules available to spread the teams evenly across rooms as much as possible (which is impossible for four teams).
 ==Examples==

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-Each pairing represents a game played in the first round. To determine the next round's pairings, leave team 1 fixed and rotate the other teams clockwise, such that team 2 is where team 3 was the previous round, team 3 is where team 4 was, etc.
+Each pairing represents a game played in the first round. To determine the next round's pairings, leave team 1 fixed and rotate the other teams counter-clockwise, such that team 2 is where team 3 was the previous round, team 3 is where team 4 was, etc. Doing the same clockwise will have the same end result, so long as the choice is consistent throughout the entire process of constructing the schedule.
 Repeating this procedure yields the following for rounds 2 through 4:

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 A combination of all these factors meant that, for many years, the [[Chicago Open]] preferred to use a full round robin followed by a final, if necessary. This was the format used almost every year between [[2004 CO|2004]] and [[2015 CO|2015]], at which point the tournament attracted enough teams that it was no longer feasible to avoid bracketing. [[2012 CO]], [[2013 CO]], and [[2015 CO]] all share the record for longest Chicago Opens, with the full round robin producing 16 games for 17 team fields.
-The only exception in this period was [[2009 CO]], which split its 14 team field into two prelim brackets and then rebracketed into an upper and lower bracket + advantaged final<ref>Note: the official stats lack the last game between "The Lady's not for Byrning" and "Ragged Dick and the Algerian Heroes", as well as their final series against "In Vinokurov Veritas"</ref>. [[2006 CO]] had few enough teams (9) that a full round robin was able to be followed by round robins in a 4 team upper bracket and 5 team lower bracket, capped off by a two game advantaged final.
+The only exception in this period was [[2009 CO]], which split its 14 team field into two prelim brackets and then rebracketed into an upper and lower bracket + advantaged final.<ref>Note: the official stats lack the last game between "The Lady's not for Byrning" and "Ragged Dick and the Algerian Heroes", as well as their final series against "In Vinokurov Veritas"</ref> [[2006 CO]] had few enough teams (9) that a full round robin was able to be followed by round robins in a 4 team upper bracket and 5 team lower bracket, capped off by a two game advantaged final.
 ==External links==

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 A '''full round robin''' eschews a prelim/playoff format in favor of one large round robin of every team. This simple format removes the need for seeding, guarantees that every team can play every other, and limits the number of byes per team to one, but limits the number of games played between the top teams; tournaments are rarely willing to make this tradeoff. It is much more common for teams to be sharply stratified between the most competitive teams and the rest of the field, in which case additional rounds against comparable opponents is more valuable. The nature of a full round robin also means that there must either be a relative low number of teams or a strong willingness to play late into the night, as there will be ''n-1'' rounds for ''n'' teams.
-A combination of all these factors meant that, for many years, the [[Chicago Open]] preferred to use a full round robin followed by a final, if necessary. This was the format used almost every year between [[2004 CO|2004]] and [[2015 CO|2015]], at which point the tournament attracted enough teams that it was no longer feasible to avoid bracketing. [[2012 CO]], [[2013 CO]], and [[2015 CO]] all share the record for longest with 16 games and 17 teams each.
+A combination of all these factors meant that, for many years, the [[Chicago Open]] preferred to use a full round robin followed by a final, if necessary. This was the format used almost every year between [[2004 CO|2004]] and [[2015 CO|2015]], at which point the tournament attracted enough teams that it was no longer feasible to avoid bracketing. [[2012 CO]], [[2013 CO]], and [[2015 CO]] all share the record for longest Chicago Opens, with the full round robin producing 16 games for 17 team fields.
 The only exception in this period was [[2009 CO]], which split its 14 team field into two prelim brackets and then rebracketed into an upper and lower bracket + advantaged final<ref>Note: the official stats lack the last game between "The Lady's not for Byrning" and "Ragged Dick and the Algerian Heroes", as well as their final series against "In Vinokurov Veritas"</ref>. [[2006 CO]] had few enough teams (9) that a full round robin was able to be followed by round robins in a 4 team upper bracket and 5 team lower bracket, capped off by a two game advantaged final.

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 ===Double round robin===
-In a '''double round robin''', every team plays every other twice. This is common in college tournaments with six teams, as a tournament which is only able to draw that many teams is likely hard enough for 10 games to be a reasonable number (compare this to, say, an [[IS set]], which is short and easy enough to reasonably allow 12+ rounds). 6-team tournaments which desire more games can have an [[advantaged final]] or break ties.
+In a '''double round robin''', every team plays every other twice. This is common in college tournaments with six teams, as a tournament which is only able to draw that many teams is likely hard enough for 10 games to be a reasonable number. Compare this to high school [[regular difficulty]] tournaments, which are short and easy enough to reasonably allow 11+ for most fields - note, however, that [[IS set]]s only have 12-13 packets and thus can only feasibly support 11 if a final is desired. 6-team tournaments which want more games can have an [[advantaged final]] or break ties.
 This format is not particularly amenable to an odd number of teams because it forces multiple byes, so tournaments in this situation may split a team or field a [[house team]].

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 ===Full round robin===
-A '''full round robin''' eschews a prelim/playoff format in favor of one large round robin of every team. This simple format removes the need for seeding, guarantees that every team can play every other, and limits the number of byes per team to one, but limits the number of games played between the top teams; tournaments are rarely willing to make this tradeoff. It is much more common for teams to be sharply stratified, in which case additional rounds against comparable opponents is more valuable. The nature of a full round robin also means that there must either be a relative low number of teams or a strong willingness to play late into the night.
+A '''full round robin''' eschews a prelim/playoff format in favor of one large round robin of every team. This simple format removes the need for seeding, guarantees that every team can play every other, and limits the number of byes per team to one, but limits the number of games played between the top teams; tournaments are rarely willing to make this tradeoff. It is much more common for teams to be sharply stratified between the most competitive teams and the rest of the field, in which case additional rounds against comparable opponents is more valuable. The nature of a full round robin also means that there must either be a relative low number of teams or a strong willingness to play late into the night, as there will be ''n-1'' rounds for ''n'' teams.
 A combination of all these factors meant that, for many years, the [[Chicago Open]] preferred to use a full round robin followed by a final, if necessary. This was the format used almost every year between [[2004 CO|2004]] and [[2015 CO|2015]], at which point the tournament attracted enough teams that it was no longer feasible to avoid bracketing. [[2012 CO]], [[2013 CO]], and [[2015 CO]] share the record for longest with 16 games and 17 teams each.

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 Though round robins ensure that all the teams in a pool have a comparable schedule, it does not make any assurances about the relative strength between pools. Using a format involving round robins does not eliminate the need for [[seeding]].
-The use of round robins in brackets is standard practice and is often implied to be the format used - hence, tournament formats can be described in terms of just their bracket sizes. For example, consider a 16 team tournament which has two prelim brackets of 8 followed by rebracketing into four brackets of 4 for a total of 10 games + a final if needed. This can be referred to as simply 8x2 ("eight by two") into 4x4 ("four by four"), with the final being implied.
+The use of round robins in brackets is standard practice and is often implied to be the format used - hence, tournament formats can frequently be described in terms of just their bracket sizes. For example, consider a 16 team tournament which has two prelim brackets of 8 followed by rebracketing into four brackets of 4 for a total of 10 games + a final if needed. This can be referred to as simply 8x2 ("eight by two") into 4x4 ("four by four"), with the final being implied.
 ==How to set up a round robin==

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 ===Triple round robin===
-In a '''triple round robin''', every team players every other thrice. This is usually only found in regions with only a small number of established teams, with the most common scenario being 4 teams playing 9 games.
+In a '''triple round robin''', every team plays every other thrice. This is usually only found in regions with only a small number of established teams, with the most common scenario being 4 teams playing 9 games.
 The aforementioned flaws with double round robins are more extreme in triple round robins.