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21d ago
Linked LRDI Question
The Appraiser's Twelve-Day Circuit · Q0
Set Setup · Scheduling & Sequencing
On which day did Farrah first examine a painting at Coriston?
This is the one step the caselet makes you earn — the clue only says the three slots share some gallery, and you pin it down by elimination. Call the shared gallery : courier on Day 3 = courier on Day 9 = examine on Day 6 = .
Rule out three of the five galleries first. Brackenfield is out: it is examined only on Days 5, 8 and 11, and is examined on Day 6. Coriston and Oskelund are out: Day 4 uses both (examine Coriston, courier Oskelund), and the no-back-to-back rule stops Day 3 from touching either — yet Day 3 couriers to . So is Vantry or Marrow Hall.
Now test = Vantry and watch it collapse. Day 3 couriers to Vantry, so its examine can't be Vantry, can't be Coriston or Oskelund (Day 4 is next door), can't be Brackenfield — it must be Marrow Hall. Day 2 then can't touch Vantry or Oskelund (Day 1) or Marrow Hall or Vantry (Day 3); only Coriston and Brackenfield survive, and Brackenfield examinations are locked to Days 5/8/11 — so Day 2 examines Coriston, and clue v forces Day 7's examine to be Coriston too. Day 5 examines Brackenfield; its courier can't be Brackenfield (same day), can't be Coriston or Oskelund (Day 4), can't be Vantry (Day 6 examines Vantry) — so it couriers to Marrow Hall. Finally Day 6 examines Vantry; its courier can't be Vantry (same day), can't be Brackenfield or Marrow Hall (Day 5), can't be Coriston (Day 7 examines it) — so it couriers to Oskelund.
But that makes Day 6 'examine Vantry, courier Oskelund' — exactly Day 1's pairing, which the no-repeated-pairing rule forbids. Vantry is impossible, so the shared gallery must be Marrow Hall.
Sanity-check it against the finished table: Day 3 examines Vantry and couriers to Marrow Hall, Day 6 examines Marrow Hall and couriers to Oskelund, Day 9 examines Coriston and couriers to Marrow Hall — clue iii holds everywhere, and no pairing or back-to-back rule breaks.
The habit to build: when a clue chains three slots to one gallery, don't guess it — list what each neighbouring day forbids and let the eliminations pick the gallery.
Final answer: Marrow Hall
Build the whole circuit first — every question is read straight off one master schedule.
Rules that hold on all 12 days:
Pin down what is handed to us:
Now push rules 2–4 along the days. Day 1 uses Vantry and Oskelund, so Day 2 can use neither; Day 2 also can't be a Brackenfield examination (those are locked to Days 5/8/11), which leaves Coriston or Marrow Hall for Day 2's examination. Because Marrow Hall is needed as the Day-6 examination and Day 3 must avoid Coriston and Oskelund (Day 4 uses both), the chain forces Day 2's examination to be Coriston, and every remaining slot falls in turn. Days 1–10 are fixed uniquely:
| Day | Examines at | Couriers to |
|---|---|---|
| 1 | Vantry | Oskelund |
| 2 | Coriston | Brackenfield |
| 3 | Vantry | Marrow Hall |
| 4 | Coriston | Oskelund |
| 5 | Brackenfield | Vantry |
| 6 | Marrow Hall | Oskelund |
| 7 | Coriston | Vantry |
| 8 | Brackenfield | Oskelund |
| 9 | Coriston | Marrow Hall |
| 10 | Oskelund | Vantry |
(Days 11–12 keep a little freedom, but none of these four questions depends on them.)
This question: the first day she examines at Coriston.
Read down the Examines at column: Vantry (Day 1), then Coriston (Day 2). Coriston first appears as the examine-gallery on Day 2.
💡 Teacher tip: Day 4 is the day a clue hands you "examine Coriston," so it feels like the answer — but the question asks for the first Coriston examination, and Day 2 comes earlier. The given clue is rarely the earliest occurrence.
Answer: Day 2 (option B)