Scratch — 5 boats, 4 races, 1 discard; BFD cannot be discarded even when it is the worst score

RRS Rule 30.4 (Black Flag Rule): a boat's BFD disqualification shall not be excluded in calculating her series score, even if the discard rules would otherwise select it as the worst score. BFD scores N+1 using series entries (5 boats → BFD = 6). With 1 discard allowed, the next-worst discardable score is dropped instead.

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

Alice gets BFD — worst score (6 pts) but non-discardable.
    Her next-worst discardable score is race 1/2/3 = 1 pt; discard one of those.
    Bob gets a normal 4 in race 4; his worst (4) is discarded.
Alice: R1=1, R2=1, R3=1, R4=6(BFD,non-disc). Total=9. Discard best discardable worst=1. Net=8.
Bob:   R1=2, R2=2, R3=2, R4=4.              Total=10. Discard worst=4.           Net=6.
Carol: R1=3, R2=3, R3=3, R4=3.              Total=12. Discard worst=3.           Net=9.
David: R1=4, R2=4, R3=4, R4=2.              Total=14. Discard worst=4.           Net=10.
Eve:   R1=5, R2=5, R3=5, R4=1.              Total=16. Discard worst=5.           Net=11.