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Round Robin Tournament Scheduling
05/28/17 at 04:26:23
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1  Guestbook / Comments / Test, just a test
 on: Today at 01:32:50 
Started by Guest | Post by Guest
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2  Schedules / Requests / Re: 20 teams, 10 dif games, 10 rounds...
 on: 05/25/17 at 12:26:07 
Started by sausage041 | Post by sausage041
You're a lifesaver! Yes, teams will only ever visit 10 of the XX locations. It is a downside to only playing 10 rounds, but we only have 1 afternoon to get everything in (the 10 rounds are used to seed a 16 team bracket).  Thanks agan!
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3  Schedules / Requests / Re: 20 teams, 10 dif games, 10 rounds...
 on: 05/25/17 at 12:19:29 
Started by sausage041 | Post by Ian Wakeling
Here are some more schedules as requested.
 

34 teams
(3 34) (33 2) (31 14) (19 13) (6 28) (24 29) (18 7) (32 23) (5 9) (22 26) (20 11) (27 8) (16 21) (30 17) (10 15) (12 25) (1 4)
(33 4) (1 34) (16 17) (15 29) (22 31) (7 26) (21 30) (20 6) (28 24) (8 12) (5 25) (18 10) (19 32) (13 23) (9 27) (11 14) (2 3)
(30 16) (14 20) (8 34) (33 5) (1 18) (17 23) (10 31) (28 4) (11 22) (27 2) (13 9) (29 26) (15 24) (32 12) (25 19) (3 21) (7 6)
(18 15) (13 32) (33 7) (6 34) (21 19) (4 20) (1 26) (11 29) (25 3) (24 10) (28 31) (12 16) (30 9) (22 14) (2 23) (17 27) (8 5)
(8 25) (23 30) (3 19) (18 24) (12 34) (9 33) (6 22) (27 21) (14 1) (31 7) (15 26) (32 5) (17 13) (29 4) (20 28) (16 2) (10 11)
(32 21) (27 5) (20 22) (17 2) (11 33) (10 34) (25 23) (24 7) (29 6) (4 15) (30 8) (14 28) (31 1) (19 16) (3 13) (26 18) (9 12)
(5 19) (31 24) (30 12) (27 3) (8 23) (28 22) (16 34) (13 33) (10 26) (32 25) (18 6) (11 1) (29 20) (2 9) (17 21) (7 4) (15 14)
(29 22) (17 8) (2 25) (9 32) (26 24) (21 5) (15 33) (14 34) (27 30) (28 11) (4 10) (20 7) (3 12) (31 18) (6 1) (23 19) (16 13)
(7 11) (25 21) (23 9) (1 28) (3 16) (8 32) (12 27) (31 26) (19 34) (33 17) (14 29) (30 2) (22 10) (6 15) (24 4) (13 5) (18 20)
(27 23) (6 10) (26 4) (21 12) (30 5) (13 2) (29 28) (25 9) (33 20) (18 34) (3 32) (31 15) (7 14) (24 11) (16 8) (22 1) (17 19)
(9 17) (7 28) (11 15) (30 25) (13 27) (31 6) (8 19) (12 2) (16 32) (1 29) (23 34) (21 33) (18 4) (5 3) (14 26) (20 10) (24 22)
(26 6) (19 12) (27 32) (10 14) (29 7) (16 25) (9 3) (17 5) (4 31) (30 13) (24 33) (22 34) (2 8) (1 20) (18 11) (28 15) (23 21)
(14 24) (29 18) (21 13) (31 11) (20 15) (3 30) (17 32) (1 10) (12 23) (16 5) (19 2) (6 4) (27 34) (25 33) (7 22) (8 9) (26 28)
(20 31) (22 15) (29 10) (23 16) (2 32) (18 14) (11 4) (30 19) (13 8) (21 9) (1 7) (17 3) (28 33) (26 34) (5 12) (24 6) (25 27)
(12 13) (26 11) (28 18) (4 22) (17 25) (15 1) (24 20) (8 3) (21 2) (6 14) (16 27) (19 9) (23 5) (7 10) (32 34) (33 30) (31 29)
(28 10) (9 16) (24 1) (26 20) (14 4) (27 19) (5 2) (18 22) (15 7) (3 23) (17 12) (13 25) (6 11) (8 21) (33 31) (29 34) (32 30)
(1 2) (3 4) (5 6) (7 8) (9 10) (11 12) (13 14) (15 16) (17 18) (19 20) (21 22) (23 24) (25 26) (27 28) (29 30) (31 32) (33 34)
 
36 teams
(17 36) (13 34) (15 35) (19 33) (16 25) (18 31) (10 27) (11 30) (12 26) (2 29) (8 32) (9 28) (24 5) (1 22) (23 3) (21 7) (4 14) (6 20)
(13 35) (15 36) (17 34) (16 31) (18 33) (19 25) (11 26) (12 27) (10 30) (8 28) (9 29) (2 32) (23 1) (3 24) (22 5) (20 4) (6 21) (7 14)
(15 34) (17 35) (13 36) (18 25) (19 31) (16 33) (12 30) (10 26) (11 27) (9 32) (2 28) (8 29) (22 3) (5 23) (24 1) (14 6) (7 20) (4 21)
(14 33) (20 25) (21 31) (22 36) (23 34) (24 35) (7 29) (4 32) (6 28) (5 27) (1 30) (3 26) (15 10) (11 17) (13 12) (18 2) (8 19) (9 16)
(20 31) (21 33) (14 25) (23 35) (24 36) (22 34) (4 28) (6 29) (7 32) (1 26) (3 27) (5 30) (13 11) (12 15) (17 10) (16 8) (9 18) (2 19)
(21 25) (14 31) (20 33) (24 34) (22 35) (23 36) (6 32) (7 28) (4 29) (3 30) (5 26) (1 27) (17 12) (10 13) (15 11) (19 9) (2 16) (8 18)
(19 29) (16 32) (18 28) (17 27) (13 30) (15 26) (5 36) (1 34) (3 35) (7 33) (4 25) (6 31) (21 2) (8 14) (20 9) (24 10) (11 22) (12 23)
(16 28) (18 29) (19 32) (13 26) (15 27) (17 30) (1 35) (3 36) (5 34) (4 31) (6 33) (7 25) (20 8) (9 21) (14 2) (23 11) (12 24) (10 22)
(18 32) (19 28) (16 29) (15 30) (17 26) (13 27) (3 34) (5 35) (1 36) (6 25) (7 31) (4 33) (14 9) (2 20) (21 8) (22 12) (10 23) (11 24)
(22 27) (23 30) (24 26) (14 29) (20 32) (21 28) (2 33) (8 25) (9 31) (10 36) (11 34) (12 35) (18 7) (4 19) (16 6) (15 5) (1 17) (3 13)
(23 26) (24 27) (22 30) (20 28) (21 29) (14 32) (8 31) (9 33) (2 25) (11 35) (12 36) (10 34) (16 4) (6 18) (19 7) (13 1) (3 15) (5 17)
(24 30) (22 26) (23 27) (21 32) (14 28) (20 29) (9 25) (2 31) (8 33) (12 34) (10 35) (11 36) (19 6) (7 16) (18 4) (17 3) (5 13) (1 15)
(12 4) (2 9) (10 8) (1 5) (11 6) (7 3) (24 16) (14 21) (22 20) (13 17) (23 18) (19 15) (28 36) (25 33) (31 34) (30 26) (35 29) (32 27)
(8 11) (5 12) (1 3) (2 10) (7 4) (9 6) (20 23) (17 24) (13 15) (14 22) (19 16) (21 18) (35 31) (30 36) (27 26) (34 25) (32 28) (33 29)
(5 9) (11 10) (12 7) (4 6) (2 3) (1 8) (17 21) (23 22) (24 19) (16 18) (14 15) (13 20) (33 30) (35 34) (32 36) (29 28) (25 27) (26 31)
(6 3) (1 7) (2 11) (12 9) (8 5) (4 10) (18 15) (13 19) (14 23) (24 21) (20 17) (16 22) (27 29) (26 32) (35 25) (33 36) (31 30) (28 34)
(7 10) (6 8) (9 4) (3 11) (1 12) (5 2) (19 22) (18 20) (21 16) (15 23) (13 24) (17 14) (34 32) (29 31) (28 33) (35 27) (26 36) (30 25)
(1 2) (3 4) (5 6) (7 8) (9 10) (11 12) (13 14) (15 16) (17 18) (19 20) (21 22) (23 24) (25 26) (27 28) (29 30) (31 32) (33 34) (35 36)
 
 
38 teams
(19 38) (7 33) (9 31) (29 5) (3 35) (13 23) (27 17) (11 25) (21 15) (37 1) (8 16) (10 14) (12 6) (18 4) (32 24) (28 36) (30 26) (22 34) (20 2)
(26 16) (38 21) (35 29) (27 33) (17 23) (31 19) (1 25) (9 5) (11 13) (7 15) (37 3) (18 30) (10 34) (36 24) (20 14) (2 8) (28 6) (32 12) (22 4)
(28 14) (12 18) (38 23) (11 21) (31 25) (35 15) (7 3) (1 27) (33 19) (13 9) (29 17) (37 5) (22 30) (32 8) (34 36) (26 4) (2 10) (16 20) (24 6)
(24 12) (10 16) (30 4) (38 25) (15 13) (3 27) (35 19) (17 31) (1 23) (5 11) (33 9) (21 29) (7 37) (34 14) (22 28) (18 20) (36 32) (2 6) (26 8)
(18 22) (6 36) (14 8) (32 34) (27 38) (1 21) (11 15) (19 29) (25 5) (3 17) (35 23) (31 7) (13 33) (37 9) (2 4) (16 30) (20 12) (26 24) (28 10)
(6 32) (2 14) (18 34) (22 10) (20 4) (38 29) (16 24) (26 36) (7 9) (31 23) (13 19) (33 35) (27 21) (1 3) (37 11) (5 15) (17 25) (8 28) (30 12)
(10 36) (8 20) (22 26) (2 18) (34 30) (5 33) (38 31) (23 21) (28 12) (27 35) (1 7) (25 3) (19 17) (15 29) (16 6) (13 37) (24 4) (9 11) (32 14)
(8 30) (28 24) (10 20) (14 36) (2 12) (17 7) (6 4) (33 38) (22 32) (29 25) (5 27) (1 9) (35 31) (11 19) (18 26) (3 23) (37 15) (21 13) (34 16)
(34 4) (32 30) (2 16) (6 20) (8 24) (28 26) (29 9) (13 3) (38 35) (33 21) (11 31) (15 19) (1 5) (25 23) (27 7) (10 12) (22 14) (37 17) (36 18)
(20 37) (26 34) (28 32) (30 24) (36 22) (6 14) (10 18) (12 8) (4 16) (38 2) (15 25) (13 27) (23 11) (17 21) (31 5) (9 35) (7 29) (3 33) (1 19)
(25 33) (22 37) (36 12) (16 28) (18 6) (2 32) (26 20) (10 24) (14 30) (34 8) (4 38) (11 17) (15 9) (5 35) (13 1) (19 7) (23 27) (29 31) (3 21)
(31 27) (11 35) (37 24) (4 12) (26 14) (18 16) (8 22) (28 20) (2 34) (10 32) (36 30) (38 6) (29 3) (13 7) (17 33) (21 25) (19 9) (15 1) (5 23)
(29 23) (27 15) (11 3) (37 26) (16 32) (4 10) (36 2) (14 18) (20 24) (30 6) (34 28) (12 22) (38 8) (31 33) (21 9) (17 1) (13 35) (5 19) (7 25)
(21 35) (17 5) (25 13) (31 15) (28 37) (22 20) (12 34) (2 30) (8 6) (36 4) (24 18) (32 26) (14 16) (38 10) (19 3) (33 29) (11 1) (23 7) (9 27)
(5 13) (31 1) (15 17) (3 9) (21 19) (37 30) (33 23) (7 35) (26 10) (14 24) (20 32) (16 36) (4 28) (2 22) (38 12) (34 6) (8 18) (27 25) (11 29)
(9 17) (19 25) (21 7) (35 1) (11 33) (34 24) (37 32) (6 22) (27 29) (28 18) (26 2) (8 4) (36 20) (16 12) (15 23) (38 14) (5 3) (10 30) (13 31)
(7 11) (9 23) (27 19) (13 17) (29 1) (8 36) (5 21) (34 37) (31 3) (12 26) (6 10) (28 2) (18 32) (20 30) (35 25) (22 24) (38 16) (4 14) (15 33)
(3 15) (13 29) (33 1) (23 19) (7 5) (25 9) (28 30) (4 32) (37 36) (22 16) (14 12) (34 20) (2 24) (6 26) (10 8) (27 11) (21 31) (38 18) (17 35)
(1 2) (3 4) (5 6) (7 8) (9 10) (11 12) (13 14) (15 16) (17 18) (19 20) (21 22) (23 24) (25 26) (27 28) (29 30) (31 32) (33 34) (35 36) (37 38)
 
18 teams (note all games are of the form 1-9 vs 10-18  
( 1 10) ( 9 11) ( 8 12) ( 7 13) ( 6 14) ( 5 15) ( 4 16) ( 3 17) ( 2 18)
( 3 18) ( 2 10) ( 1 11) ( 9 12) ( 8 13) ( 7 14) ( 6 15) ( 5 16) ( 4 17)
( 5 17) ( 4 18) ( 3 10) ( 2 11) ( 1 12) ( 9 13) ( 8 14) ( 7 15) ( 6 16)
( 7 16) ( 6 17) ( 5 18) ( 4 10) ( 3 11) ( 2 12) ( 1 13) ( 9 14) ( 8 15)
( 9 15) ( 8 16) ( 7 17) ( 6 18) ( 5 10) ( 4 11) ( 3 12) ( 2 13) ( 1 14)
( 2 14) ( 1 15) ( 9 16) ( 8 17) ( 7 18) ( 6 10) ( 5 11) ( 4 12) ( 3 13)
( 4 13) ( 3 14) ( 2 15) ( 1 16) ( 9 17) ( 8 18) ( 7 10) ( 6 11) ( 5 12)
( 6 12) ( 5 13) ( 4 14) ( 3 15) ( 2 16) ( 1 17) ( 9 18) ( 8 10) ( 7 11)
( 8 11) ( 7 12) ( 6 13) ( 5 14) ( 4 15) ( 3 16) ( 2 17) ( 1 18) ( 9 10)

 
I am thinking that as the number of teams rise, the proportion of the locations visited by each team is getting less since you are restricted to 10 rounds.  So with 38 teams, each team visit only 10 of the 19 locations.
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4  Schedules / Requests / Re: 20 teams, 10 dif games, 10 rounds...
 on: 05/25/17 at 11:09:21 
Started by sausage041 | Post by sausage041
Hi Ian, wondering if you can assist me again on this scheduling.  My event has grown over the years and am now in need of a 34, 36, and 38 team schedule.  As a reminder, we only play 10 rounds (we don't play through the entire round robin), each team will only play once at a location, each team will only play another team once.  Like I have done with the 32 team schedule above, I cut the match-ups after round 10 and only use the scheduling for rounds 1-10.  In the 32 team schedule above, teams do not repeat at a location until round 17 I believe, so that is no problem.  With only 10 rounds, teams will not play at all the locations, which is fine, as long as they do not repeat at a location or against a team in the first 10 (maybe 12) rounds.  
 
Also, as a side, is there a schedule with the above requirements for 18 teams? In my book of schedules, I have a gap between 16 and 20 teams.  With an 18 team schedule, I could make 2 divisions of 18 teams to complete the 36 team schedule that way if there is not a cleaner way.
 
Hopefully you'll see this today or tomorrow.  Event is Saturday morning, the late registration numbers have me nervous!
 
Thanks so much!
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5  Schedules / Requests / Re: Golf Trip - Ryder Cup format
 on: 05/25/17 at 09:32:25 
Started by PuckMark | Post by PuckMark
That is a TREMENDOUS improvement over what I had.  Thanks!
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6  Schedules / Requests / Re: Golf Trip - Ryder Cup format
 on: 05/25/17 at 04:54:20 
Started by PuckMark | Post by Ian Wakeling
I can't see a way to make it work either.   The best I have at the moment is:

[(A2 A6 v B1 B4)] [(A8 A5 v B3 B7)] [(A3 A7 v B8 B5)] [(A1 A4 v B2 B6)]
[(A1 A5 v B7 B2)] [(A2 A7 v B5 B1)] [(A8 A4 v B6 B3)] [(A3 A6 v B4 B8)]
[(A3 A4 v B5 B2)] [(A1 A7 v B6 B8)] [(A8 A6 v B7 B1)] [(A2 A5 v B4 B3)]
[(A2 A8 v B6 B5)] [(A1 A3 v B4 B7)] [(A5 A6 v B8 B2)] [(A7 A4 v B3 B1)]
[(A7 A6 v B2 B3)] [(A5 A4 v B1 B8)] [(A1 A8 v B5 B4)] [(A2 A3 v B7 B6)]
[(A2 A4 v B8 B7)] [(A1 A6 v B3 B5)] [(A3 A5 v B1 B6)] [(A8 A7 v B2 B4)]

which meets the 6 out of 7 teammates criterion.  However everyone has one player on the opposite team who they never play against.  Is that an improvement on what you have already?
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7  Schedules / Requests / Re: Mixed Doubles Round Robin - Large Group
 on: 05/25/17 at 02:45:40 
Started by vertical23 | Post by vertical23
I am stunned!  Not only did that help, it basically changed my life!!!  I can't believe how perfect this is.  You offered an extra feature I hadn't even considered, gave matchup scenarios for different sized large groups, and made it possible for same sex players to meet everyone as well.  This is incredible!  
 
I have been searching the web for hours trying to come up with solutions.  Nothing I found was a fraction as good as this.  Thank you!!
 
 
Ryan
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8  Schedules / Requests / Re: Mixed Doubles Round Robin - Large Group
 on: 05/25/17 at 01:54:50 
Started by vertical23 | Post by Ian Wakeling
Ryan,
 
Yes, this is possible without the sub-groups.  Have a look at this old thread and download my Excel file using the paper-clip link.  You can use the schedule from the 48 player worksheet.  It's presented in a format suitable for Golf foursomes, however with a little modification it will work for mixed doubles.  For example the 2nd foursome in the 1st round is :
 
(A2 A19 B4 B21)
 
convert A to M, B to F, and take the columns in the order 1, 4, 2, 3 to obtain the mixed doubles game
 
(M2 F21) v (M19 F4)
 
Apply the same conversion to all foursomes to obtain the 12 round, 12 court schedule.  This will meet your main criterion of every man to play with every woman, and vice versa.  In addition, all same sex opponents will be different, and all players play exactly once on each court.
 
If you have information on the ability of the players, then see the note on the 1st worksheet.  So you would assign M1-M12 and F1-F12 as the best 12 players of each sex, and end up with games where there is no particularly strong or particularly weak partnerships.
 
Hope that helps,
 
Ian
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9  Schedules / Requests / Golf Trip - Ryder Cup format
 on: 05/24/17 at 21:14:17 
Started by PuckMark | Post by PuckMark
Ok, I am stumped and found this message board while googling for help.  Hopefully someone can help me.
 
I organize an annual golf trip with 16 guys.  We play 6 rounds of golf during the trip, and we are divided into two teams of 8.  I'd like to organize the trip so that everyone plays with as many of the other guys as possible.  
 
I realize that since each guy has 7 teammates and there are only 6 rounds of golf, there will be one teammate that each guy doesn't get to play with.  That's fine.  But I'd like to make it so that they play with/against every other player if possible.  I just haven't been able to make it work.  Does anybody have any thoughts?
 
Thanks in advance.
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10  Schedules / Requests / Mixed Doubles Round Robin - Large Group
 on: 05/24/17 at 19:40:09 
Started by vertical23 | Post by vertical23
Hey!
 
I'm running a mixed doubles round robin tennis tournament with 48 people (ideally).  Half will be men, half will be women.  The main point of the event is for every man to play a match with every woman, and vice versa.  It is NOT required they play on the same team.  As long as they play in a game with each person from the opposite sex, the requirement is met.  It is NOT mandatory that every man plays a match with every other man, and vice versa.  If a man plays with the same man more than once, this is definitely OK.  
 
Ideally, we will have 12 courts running simultaneously with 12 rounds overall.  We can offer more courts if needed but it must be done in 12 rounds or less.  Is this possible to do?  
 
Alternatively, we could break the large group into smaller subgroups and rotate people after they've met everyone in this smaller group.  Example - run 4 subgroups of 12 people simultaneously.  In each subgroup, the 6 men meet the 6 women over 3 rounds while using 3 courts.  Once all 4 subgroups of 12 have completed their 3 rounds, we mix people into new 12 person subgroups that have people from the opposite sex they haven't played with yet.  Again, they play 3 rounds on 3 courts and meet everyone from the opposite sex.  This process is then repeated 2 more times until all 24 men have played all 24 women.    
 
I haven't started selling tickets yet so I can dictate the number of people we invite.  If there's a number that's close to 48 that works better, I'm definitely up for suggestions.  If anyone can figure this out, it would be AMAZINGLY helpful!  
 
Ryan
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