9 golfers in groups of 3

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Question from Andrew, a teacher:

We are a group of 9 golfers.
We play 4 rounds in 3 groups of 3.
What would be the most equitable where everyone plays with another at least 1 time...?.
Thank you.

Andrew,

This schedule has every pair together exactly once over the 4 days.

Day 1: 1, 4, 7; 2, 5, 8; 3, 6, 9
Day 2: 1, 5, 9; 2, 6, 7; 3, 4, 8
Day 3: 1, 6, 8; 2, 4, 9; 3, 5, 7
Day 4: 1, 2, 3; 4, 5, 6; 7, 8, 9

--Victoria

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