Per-race options — a race marked 'must count' is never discarded, even when it is a boat's worst

Scoring configuration: 1 discard from race 4. DNF/OCS scoring: A5.2 (series entries).

The centrepiece race. Alice has her worst day of the series in it.
Points per race, and what each boat may discard (race 3 is protected):
  Alice: 1, 1, 4, 1 — total=7.  Discardable: 1, 1, 1 → drop race 1 → net=6.
  Bob:   2, 2, 1, 2 — total=7.  Discardable: 2, 2, 2 → drop race 1 → net=5.
  Carol: 3, 3, 2, 3 — total=11. Discardable: 3, 3, 3 → drop race 1 → net=8.
  David: 4, 4, 3, 4 — total=15. Discardable: 4, 4, 4 → drop race 1 → net=11.