Golf Tournament - 12 players, 6 players on Team A & 6 players on Team B. 3 groups of 4 play each day. 7 days in total. Each group should have 2 players from Team A v 2 players from team B. Can anyone provide formula that will generate the fixtures for the 7 days which ensures teammates do not play each other more than twice and opponents are not matched more than 3 times?