Tennis club scheduling
Problem description
Every week the tennis club has four teams playing round robin against each other. Assign those four spots to the teams fairly.
Hard constraints:
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Conflict: A team can only play once per day.
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Unavailability: Some teams are unavailable on some dates.
Medium constraints:
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Fair assignment: All teams should play an (almost) equal number of times.
Soft constraints:
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Evenly confrontation: Each team should play against every other team an equal number of times.
