Recent Posts

81

Requests / variation on a steiner triple system

« Last post by babyteeth on November 15, 2024, 07:19:17 PM »

Hi there!
I have a scenario for which I cannot find a representative solution and I could use your help!
I have a group of players who want to play in a 3v3 tournament, and we want to arrange each player into rotating groups of three such that every player will play the same number of matches, play either with -or- against every other player at least once, AND minimize the total number of matches.
The current number of players is 18, but will change for each tournament, so I am looking for a generalizable solution as opposed to brute force.
Please let me know if there is any information required that I have left out. Thank you!
BT

82

Requests / Mixed Doubles, rotating partners and opponents, 16 players, 8 rounds, no repeat

« Last post by laz on November 15, 2024, 03:39:03 PM »

Is it possible to create a Mixed Doubles schedule with rotating partners and opponents, only playing with each partner one time and only playing against each opponent one time.

If this is not possible, could I please schedule where each player plays with different partner each match but can play against the same opponent a maximum of 2 times?

Male Players: 8
Female Players: 8
Rounds: 8
Courts: 4

Male Players
M1
M2
M3
M4
M5
M6
M7
M8


Female Players
F1
F2
F3
F4
F5
F6
F7
F8

83

Requests / Bridge tables arrangement

« Last post by freddot5 on November 15, 2024, 02:19:32 PM »

I have 12 couples for bridge playing at 6 tables for 11 rounds. How do I arrange so that each couple plays each other only once?

84

Requests / Re: Create a "balanced" schedule for 10 players and 2 courts over 25 weeks

« Last post by karyn on November 14, 2024, 09:54:49 AM »

Ian - 

I have just wandered back to here and found your reply and solution.

I like it!  Thank you so much!

Karyn

85

Requests / Re: Home teams clash

« Last post by Ian Wakeling on October 29, 2024, 04:38:29 AM »

My Excel spreadsheet can help you do this.  Note that it does not work on an apple mac.  There are some more details in this thread, but basically if you view the single or double round robin in home/away format and "do not randomize" then you should find it relatively easy to pair up the teams who share a venue, by looking for the sequences of back-ground color that are out of step with each other.

86

Requests / Re: Create a "balanced" schedule for 10 players and 2 courts over 25 weeks

« Last post by Ian Wakeling on October 29, 2024, 04:27:11 AM »

I think the schedule below should work with all pairs of players meeting on court together either 6 or 7 times.

  ( 3  8  6  7) ( 5  4  2  9)  ( 1 10)
  ( 4  9  7  8) ( 1  5  3 10)  ( 2  6)
  ( 5 10  8  9) ( 2  1  4  6)  ( 3  7)
  ( 1  6  9 10) ( 3  2  5  7)  ( 4  8)
  ( 2  7 10  6) ( 4  3  1  8)  ( 5  9)

  ( 5  7  4  9) ( 8  2  6  3)  ( 1 10)
  ( 1  8  5 10) ( 9  3  7  4)  ( 2  6)
  ( 2  9  1  6) (10  4  8  5)  ( 3  7)
  ( 3 10  2  7) ( 6  5  9  1)  ( 4  8)
  ( 4  6  3  8) ( 7  1 10  2)  ( 5  9)

  ( 5  9  6  7) ( 2  3 10  4)  ( 1  8)
  ( 1 10  7  8) ( 3  4  6  5)  ( 2  9)
  ( 2  6  8  9) ( 4  5  7  1)  ( 3 10)
  ( 3  7  9 10) ( 5  1  8  2)  ( 4  6)
  ( 4  8 10  6) ( 1  2  9  3)  ( 5  7)

  ( 7  5  2  4) (10  6  3  9)  ( 1  8)
  ( 8  1  3  5) ( 6  7  4 10)  ( 2  9)
  ( 9  2  4  1) ( 7  8  5  6)  ( 3 10)
  (10  3  5  2) ( 8  9  1  7)  ( 4  6)
  ( 6  4  1  3) ( 9 10  2  8)  ( 5  7)

  ( 2  7  8  4) ( 5 10  9  3)  ( 1  6)
  ( 3  8  9  5) ( 1  6 10  4)  ( 2  7)
  ( 4  9 10  1) ( 2  7  6  5)  ( 3  8)
  ( 5 10  6  2) ( 3  8  7  1)  ( 4  9)
  ( 1  6  7  3) ( 4  9  8  2)  ( 5 10)

87

Requests / Have I done this correctly?!

« Last post by mh on October 28, 2024, 07:40:55 PM »

Please can you look for errors in the schedule? Every player 1-24 should: 

• play 8 times and rest for 4 rounds. 
• Play with each player on their ability court once each e.g. 1 with 2,3,4,5,6 at some point. 
• They should not face any other player more than twice in total.
• Not be scheduled to rest in consecutive rounds. 

I think I managed it but would really appreciate a second look!!

Rnd

COURT 1

Rest

COURT 2

Rest

COURT 3

Rest

1

4/22

10/16

1,6

3/21

9/15

7,12

2/20

8/14

13,18

5/23

11/17

19,24

2

2/23

9/17

3,4

1/24

8/15

10,11

6/24

12/18

14,16

5/19

7/13

20,21

3

4/19

11/18

2,5

3/22

10/16

8,9

6/21

7/14

15,17

1/20

12/13

23,24

4

11/2

3/6

1,4

9/12

8/5

7,10

23/14

15/18

13,16

21/24

20/17

19,22

5

7/4

3/5

2,6

9/11

10/1

8,12

19/16

15/17

14,18

21/23

22/13

20,24

6

2/4

8/10

1,5

3/12

6/9

7,11

14/16

20/22

13,17

15/24

18/21

19,23

7

1/6

2/5

3,4

7/12

8/11

9,10

13/18

14/17

15,16

19/24

20/23

21,22

8

1/3

4/6

2,5

7/9

10/12

8,11

13/15

16/18

14,17

19/21

22/24

20,23

9

1/5

2/3

4,6

7/11

8/9

10,12

13/17

14/15

16,18

19/23

20/21

22,24

10

2/6

4/5

1,3

8/12

10/11

7,9

14/18

16/17

13,15

20/24

22/23

19,21

11

1/2

3/4

5,6

7/8

9/10

11,12

13/14

15/16

17,18

19/20

21/22

23,24

12

1/4

5/6

2,3

7/10

11/12

8,9

13/16

17/18

14,15

19/22

23/24

20,21

88

Requests / Re: Round Robin Schedule For Changing Teams

« Last post by NTLKnight on October 23, 2024, 01:26:16 AM »

Hello again Ian, and thank you SO much for these latest schedules!--I somehow missed them when you posted a couple weeks ago...I saw them today as I needed to look to see if there were any answers because this Saturday we may have a 20-man tourney...most likely on 5 courts (so there will not need to be any byes). No pressure at all, but if you get a chance to help me with this schedule, I'd so much appreciate it!

• 20 PLAYERS (10 TEAMS OF 2) • 5 COURTS • 5/6/7 GAMES • PLAYERS PLAY WITH RANDOM PARTNERS EACH GAME & AGAINST ALL OTHER PLAYERS AS BALANCED AS POSSIBLE. (I can just delete games (rounds) 6/7 to get a version with 5/6 games...as with the other schedules you've helped me with...if that would apply. Thanks!)

Much appreciated,
Nathan

89

Requests / Create a "balanced" schedule for 10 players and 2 courts over 25 weeks

« Last post by karyn on October 21, 2024, 04:07:08 PM »

I am trying to create a schedule for 10 tennis players over 25 weeks.

Every week, there will be 2 courts of 4 people.  Two people will have a bye each week.  

Once on the court, the 4 people will decide amongst themselves who wants to play with whom.

I would like to balance the schedule, as much as is possible with 10 people, so that no two people are on the same court together a disproportionate amount of time.  To be clear, I don't care if anyone is always playing on court 1 or mostly on court 2; I just don't want, for example, Person 1 and Person 2 being on the same court together 15 times and Person 1 and Person 8 only ever being on the same court together 3 times.

Any help would be appreciated.  I've gotten pretty close with modifying some of what I've seen here, but find myself thinking that for those with skills, it's probably a short and elegant piece of code...

90

Requests / Re: Am I asking for the impossible?

« Last post by markyb610 on October 19, 2024, 06:29:01 AM »

Ian,

That's amazing - Perfect !!

Many thanks   - and so quick too !
Mark