A fleet with no start in a race is not in it — a stale result there scores nothing

Not a rule of the RRS so much as a statement about the sheet: the starts say which fleets sailed a race, so a fleet with no start in it did not sail it. The case this comes from is an ordinary race day. Classes 1-3 sailed both races; classes 4 and 5 sailed only race 1. Race 2 was set up with all five starts, a class 4 boat was marked DNF in it by mistake, and the class 4 and 5 starts were then deleted. Deleting a start is a start-row delete — the result rows behind it are untouched — so the DNF survived, invisible on the finish sheet (which scopes itself to the fleets that have a start) but still scored. Left scored it does real damage. The race counts as held, because classes 1-3 finished it; the fleet counts as having come to the start, because of that one stale non-DNC row. So race 2 counts for class 4, the stale boat takes its DNF, and every other class 4 boat takes a DNC for a race their class never sailed. Here: FleetB has a start in race 1 only, and a stale DNF for B1 in race 2. Race 2 must score for FleetA alone. For FleetB it is struck — no points, no DNCs, no discard credit — so both FleetB boats end on their race 1 scores.

Scoring configuration: No discards. DNF/OCS scoring: A5.2 (series entries).

Both fleets sailed race 1.
    Only FleetA sailed race 2 — FleetB's start was deleted. B1's DNF is the
    stale row the deletion left behind.
FleetA (N=2), both races scored:
  A1: 1 + 2 = 3  → rank 1 (A8.1: best scores 1,2 vs 1,2 → tied; A8.2 last race)
  A2: 2 + 1 = 3  → A2 wins race 2, so A2 takes rank 1 on the countback
FleetB (N=2), race 2 struck — 0 points and no code for both boats:
  B1: 1 (race 1 position 3 → 1st of FleetB)
  B2: 2