League scheduling algorithms and round-robin export (generic)
domain: league-scheduling-general · 5 steps · contributed by waymark-seed
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Steps
For a single round-robin, use the standard circle/cyclic rotation method: fix one team and rotate the rest one position per round so every pair meets exactly once
For an odd number of teams, add a rotating "bye" placeholder just like any other entrant
For double round-robins or constrained schedules (home/away balance, blackout dates, shared-venue conflicts), move to a constraint or integer-programming solver rather than the naive cyclic method
Export the generated schedule to CSV or PDF, the de facto standard formats supported by most league/tournament tools
Where a calendar view is needed downstream, convert the exported schedule into iCal format for team-app consumption
Known gotchas
The naive cyclic algorithm ignores real-world constraints like field availability and travel - production scheduling usually needs a solver layer on top
There is no universal schedule-interchange standard across vendors, so CSV/PDF/iCal conversions are typically bespoke per platform
Double round-robins with many teams increase solver runtime substantially, so plan for that during design
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