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Bridge & other card games/bridge rotation schedule

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Question
I need a variation of your 20 couple 9 month schedule we have 20 couples and play 9 times, but we play 4 couples together each time, so each couple plays 3 couples each time they play.  so need a rotation with as few double up playing each time and yet each couple plays each other couple at least one timergq

Answer
Hi,

Since you have 20 pairs and 4 play together each time, I assume there are 5 different sites. The following is for 10 months but you can omit the last month if you only need 9. It list the four pair numbers at each of the five sites for each month.



Month     Site 1     Site 2     Site 3     Site 4     Site 5

 1     1 10 3 11  6 16 5 19   9 18 4 8  13 17 14 2  12 15 7 20
 2     2 1 4 12  7 17 6 20  10 19 5 9  14 18 15 3  13 16 8 11
 3     3 2 5 13  8 18 7 11   1 20 6 10 15 19 16 4  14 17 9 12
 4     4 3 6 14  9 19 8 12   2 11 7 1  16 20 17 5  15 18 10 13
 5     5 4 7 15  10 20 9 13  3 12 8 2  17 11 18 6  16 19 1 14
 6     6 5 8 16  1 11 10 14  4 13 9 3  18 12 19 7  17 20 2 15
 7     7 6 9 17  2 12 1 15   5 14 10 4  19 13 20 8  18 11 3 16
 8     8 7 10 18 3 13 2 16   6 15 1 5  20 14 11 9  19 12 4 17
 9     9 8 1 19  4 14 3 17   7 16 2 6  11 15 12 10 20 13 5 18
10    10 9 2 20  5 15 4 18   8 17 3 7  12 16 13 1  11 14 6 19  

Bridge & other card games

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I can answer questions on bidding and on cardplay with the caveat that the former may necessarily involve some subjectivity. I have been playing tournament bridge for over 20 years and I have won several regional tournaments.

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