RRS A8.1 then A8.2. Alice and Bob each score 8 points with identical sorted score lists ([1, 2, 5] each), so A8.1 cannot separate them. A8.2 then ranks by the last race (both DNC, equal), then the next-to-last race (race 2), where Bob finished 1st and Alice 2nd: Bob ranks ahead. These countback scores are used even though one of them (the DNC) would be discarded — A8.2 includes excluded scores.
Scoring configuration: No discards. DNF/OCS scoring: A5.2 (series entries).
4 boats, N+1 = 5.
Alice: 1st, 2nd, DNC → 1+2+5=8 sorted best-to-worst [1, 2, 5]
Bob: 2nd, 1st, DNC → 2+1+5=8 sorted best-to-worst [1, 2, 5] ← identical to Alice
Carol: 3rd, 3rd, 1st → 3+3+1=7 (wins outright)
David: 4th, 4th, 2nd → 4+4+2=10
Tie-break (Alice vs Bob):
A8.1 — sorted scores [1,2,5] vs [1,2,5] → identical, cannot separate
A8.2 — last race (race 3): Alice=5, Bob=5 → equal
next-to-last race (race 2): Alice=2, Bob=1 → Bob wins
Alice and Bob both DNC; Carol wins, David 2nd