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Bridge & other card games/bridge rotation schedule

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Question
20 couples, 9 months, 4 couples playing at same time so each couple plays 3 other couples every month.  need a rotation where everybody plays everybody else at least one time.  and hostess couple is different each month. realize will play some more than one time, but would like the most even playing schedule possible.  thank you

Answer
Hi,

Here is a schedule for 20 pairs, 5 different sites 10 months. For 9 months you may omit the last line. the first pair at each site can be the hostess.

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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