Round Robin Tournament Scheduling

Recent Posts

31
Requests / Re: Am I asking for the impossible?
« Last post by Mike Von on August 29, 2024, 02:30:13 PM »
Ian,

I forgot to specify 2 courts.

Thanks,
Mike
32
Requests / Re: 22 team event
« Last post by Soccer2426 on August 29, 2024, 12:43:35 PM »
This is perfect!!! Thank you so much.  Hopefully this was not too much trouble.
And thank you for the fast response!
33
Requests / Re: Am I asking for the impossible?
« Last post by Mike Von on August 29, 2024, 11:57:03 AM »
Ian,

I searched the site but couldn't find:

eight players
doubles tennis
three rounds
only play against a player once
the one player you don't play against, you have as a partner once during the 3 rounds

Is there a solution that meets these requirements?

Any help is much appreciated.
34
Requests / Re: 22 team event
« Last post by Ian Wakeling on August 28, 2024, 04:50:05 PM »
Welcome back!  I think the schedule below should work, each of the 10 rows is a round.

    G1      G2      G2      G2      G3      G3      G3      G4     G4      G4 
  (13  9) (15 18) (19  3) ( 4 11) (16  6) ( 5 17) (14  1) ( 2  7 (20  8) (10 12)
  (14 10) (11 19) (20  4) ( 5 12) (17  7) ( 1 18) (15  2) ( 3  8 (16  9) ( 6 13)
  (15  6) (12 20) (16  5) ( 1 13) (18  8) ( 2 19) (11  3) ( 4  9 (17 10) ( 7 14)
  (11  7) (13 16) (17  1) ( 2 14) (19  9) ( 3 20) (12  4) ( 5 10 (18  6) ( 8 15)
  (12  8) (14 17) (18  2) ( 3 15) (20 10) ( 4 16) (13  5) ( 1  6 (19  7) ( 9 11)
  (20  1) ( 4  6) (13 10) ( 8 17) ( 5 11) ( 9 15) ( 7 18) (19 14 ( 2 12) (16  3)
  (16  2) ( 5  7) (14  6) ( 9 18) ( 1 12) (10 11) ( 8 19) (20 15 ( 3 13) (17  4)
  (17  3) ( 1  8) (15  7) (10 19) ( 2 13) ( 6 12) ( 9 20) (16 11 ( 4 14) (18  5)
  (18  4) ( 2  9) (11  8) ( 6 20) ( 3 14) ( 7 13) (10 16) (17 12 ( 5 15) (19  1)
  (19  5) ( 3 10) (12  9) ( 7 16) ( 4 15) ( 8 14) ( 6 17) (18 13 ( 1 11) (20  2)

Or perhaps you can divide the 20 teams into 2 groups of 10 teams?  Then it is possible to schedule all games to be between group. Let me know and I can find another schedule.
35
Requests / Re: Round Robin Schedule For Changing Teams
« Last post by Ian Wakeling on August 28, 2024, 03:42:16 AM »
Hi Nathan,  Good to know it worked and thanks for posting the link.

For 4/5 rounds using the schedule in reply #5 above.

Ian
36
Requests / Re: Round Robin Schedule For Changing Teams
« Last post by NTLKnight on August 27, 2024, 11:14:48 PM »
Now I will look at 16 players, 4 courts and 7 rounds.  My software is not finding an optimal solution, but it gives me a schedule like this:

( 6 12 v  9 10)  ( 5 13 v 11 15)  ( 1  7 v 14  2)  (16  8 v  4  3)
(10 11 v  4  1)  ( 2  9 v  5 16)  (15 13 v  6  8)  (14  7 v  3 12)
( 5  9 v  8  7)  (12 13 v  2  4)  (10  6 v 14 11)  (15  1 v 16  3)
(12 16 v 13 11)  ( 8  1 v  6  7)  (15  2 v 14  9)  ( 3  5 v  4 10)
( 7 15 v  4 11)  (12  5 v  1  6)  (13  9 v  3 14)  ( 8  2 v 10 16)
(12  2 v  3 15)  (16  4 v  6 14)  ( 7  5 v 10 13)  ( 9  8 v  1 11)
( 2  3 v  6 11)  (12 14 v  8  5)  ( 4 13 v  1  9)  ( 7 10 v 16 15)
.....

Just entered your first draft of numbers (16 players, 4 courts, 7 games)...and I think this is as good as it gets!  (Not sure why I have to enter your numbers in my own Excel spreadsheet...it takes me a while to do that!--but I just want to see if my colorful spreadsheet confirms the amount of times each player plays against other players!) Like you said, the only players that meet each other twice, are 2/16 & 5/10...which is *absolutely fine*! Every other player faces off one time...which is more than I've ever been able to achieve trying to randomize these numbers!  Here's what it looks like on my "conditionally formatted" spreadsheet...when I enter your numbers:



So for creating a schedule with 4/5 games (rounds)...should I just use the 6 round version you game me last week...and remove the last games (5/6) that I don't want included?

Thanks again,
Nathan
37
Requests / Re: 22 team event
« Last post by Soccer2426 on August 27, 2024, 11:08:11 PM »
Actually….2 teams just dropped out. >:(Everything above is the same - just for 20 teams, not 22. Thank you!!
38
Requests / Re: Round Robin Schedule For Changing Teams
« Last post by NTLKnight on August 27, 2024, 10:24:19 PM »
Ian, thank you so much. I didn't want to wait too long to let you know that I used the solution your program provided for a tourney on Saturday. 16 players, 4 courts, 6 games...with a 7th game at the end for the top 8 players (a Finals game).  Here's the link, if you're interested to see how it went: https://www.avllife.com/everyman4himself-39/

I will now look at your solution for 7 games. This would be for events where we don't want to have a "Finals" game, but let everyone play 7 games and then just count up the wins and point differentials. Same for 5 games and 4 games...for days when there isn't as much time.

Best Regards,
Nathan
39
Requests / 22 team event
« Last post by Soccer2426 on August 27, 2024, 05:53:24 PM »
Hi, 
You have saved my behind several times in the past (THANK YOU) and I am hoping you can do so 1 more time.  Here are the details of my event:
22 teams
4 different events
Game A - each team competes 1x
Games B, C and D - each team competes several times; ideally each team competes in each of the events the same # of times. e.g. Every team plays each of A,B and C 3 times

I'd like the event to run anywhere from 10 to 14 rounds if possible.
If i need to add a 4th Game to make things work I can do that. This game can be played 1x or 2x or 3x etc. to make this work.
If i need to add another round i can also do that.
If there is any other tweak that would make this possible i can probably do it.
I have enough equipment to run the same game 3 times (maybe 4 times) each round. e.g. 6 teams could all play game A in the first round.

The only real priority is that each team plays each game the same # of times.

I have been struggling for days to make this work b/c i did not want to bother you again but i have come up empty....
Thank you in advance for your consideration!



40
Requests / Re: Round Robin Volleyball
« Last post by Ian Wakeling on August 24, 2024, 06:30:54 AM »
This can be done in a way where each team plays each other team twice.  For example:

   Site 1    Site 2    Bye
 (1  2  4)  (3  5  6)    7
 (4  5  7)  (6  1  2)    3
 (7  1  3)  (2  4  5)    6
 (3  4  6)  (5  7  1)    2
 (6  7  2)  (1  3  4)    5
 (2  3  5)  (4  6  7)    1
 (5  6  1)  (7  2  3)    4

Does that help?