Round Robin Tournament Scheduling

bridge schedule

sue · 3 · 1895

sue

  • Newbie
  • *
    • Posts: 0
on: May 23, 2022, 12:42:53 PM
I want to make a schedule for 28 teams that play for 8 months. Each month four teams play each other. is it possible to make a schedule and have no two teams play each other more than once?  Also, keeping numbers 1 - 7  in the first column, 8  - 14  in the second column, etc.

    1  8    15   22
    2  9    16   23  
    3  10  17   24
    4  11  18   25
    5  12  19   26
    6  13  20   27
    7  14  21   28

I think i need a miracle.

Thank You,
Sue Colella
    


sue

  • Newbie
  • *
    • Posts: 0
Reply #1 on: May 24, 2022, 10:23:01 PM
I want to make a schedule for 28 teams that play once a month for 8 months.
Each month  four teams play each other. Is it possible to make a schedule and  have no two teams play each other more than once?  Also, keeping numbers 1-7 in the first column, 8-16 in the second column, etc.

Sincerely,
Sue


Ian Wakeling

  • Forum Moderator
  • God Member
  • *****
    • Posts: 1141
Reply #2 on: May 25, 2022, 04:19:24 AM
Sue,

Unfortunately, what you are asking is impossible.  Arranging players in columns in the way that you have specified means that a player can never play against the other 6 players within their column.  This limits the total number of opponents to 21.  However in 8 months of play a player must have 24 opponents, and as there is only a pool of 21 to choose from, this means that some of the opponents must be the same.  All may not be lost, if you reduce the requirement to 7 months of play, then you can have all 21 possible opponents exactly once - to do this the use the foursome schedule for 28 players that you can find in the attachment available in this thread.

BTW you can only see attachments if you are logged into the forum.

Ian