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Bridge & other card games/rotation for marathon

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Question
I need a 12 couple rotation for seven months.  It would be nice if everyone played with each other at least once and not more than 2 or 3 times during the seven months.

Answer
Hi,

A complete rotation for 12 pairs, each playing every other pair exactly one time, lasts 11 rounds. If you only play one round per month then each pair can only play seven other pairs. If you choose to play more than one round per month (change opponents) then it is possible to play everyone else. Below is the complete 11 round movement. Assign each pair a number 1-12.

Round          Pair Matchups

1    12-1  11-2  10-3  9-4  8-5  7-6
2    12-2  1-3   11-4  10-5 9-6  8-7
3    12-3  2-4   1-5   11-6 10-7 9-8
4    12-4  3-5   2-6   1-7  11-8 10-9
5    12-5  4-6   3-7   2-8  1-9  11-10
6    12-6  5-7   4-8   3-9  2-10 1-11
7    12-7  6-8   5-9   4-10 3-11 2-1
8    12-8  7-9   6-10  5-11 4-1  3-2
9    12-9  8-10  7-11  6-1  5-2  4-3
10   12-10 9-11  8-1   7-2  6-3  5-4
11   12-11 10-1  9-2   8-3  7-4  6-5

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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