Ten players, four quarters, seven on the pitch and every parent counting minutes. Build a rotation that breaks no rules. New puzzle every day.
Four quarters times seven shirts is 28 slots. Two keepers take two quarters each, which leaves 24 for eight outfielders: three quarters each, one rest each, two resting per quarter. Everything else is puzzle.
The free coach app does this rotation for your actual squad, tracks playing time over the season and prints the line-up sheet.