Interactive Red String prototype, v4: a paragraph pinned across a corkboard in a zigzag and strung in reading order. A thread carries a tag only where the next sentence opens with a connector, and the tag is that connector as printed. Rookie: one sentence is loose with its connector printed; splice it and file it. Detective: one sentence is misplaced and its connector is blanked; splice it, fill the blank from the test’s four words, then file it.

Peregrine · live prototype · spec §1.13 (v4, 2026-09-07)

Red String

Writing-native. A paragraph is pinned across the board in a zigzag and strung in reading order. The board says nothing about connectors: the thread is plain, and the only tag that ever appears is the blank the detective has to fill. The test never announces a relation, and neither does the board.

Rookie is the placement item: one sentence loose, exactly as printed, no hint. Splice it, file it. Detective is a two-part move: the placement item plus the transitions item. One sentence is misplaced and its connector is blanked in place. Splice it, fill the blank from the test’s four words, file it.

Prototype controls

Try: read the loose sentence, find what it follows from, drag it onto that thread, press and hold. Switch to detective: the connector is a blank; place the sentence on logic alone, then fill the blank.

Red String
1/2
exhibit 21 · the skerry light 120 coin
One sentence is loose. Splice it in where the paragraph needs it.
Drag it onto the thread. The string parts where it will take.
drag the loose sentence onto the thread
the thread runs in reading order · read down it
Read it as filed ▸
Put it back
as it stands · exhibit 21
Back to the board

v4 — positioned the way the test positions you

  1. Nothing is announced (settled 2026-09-07). No relation words, no connector tags. The thread is plain in both tiers. The only tag that ever appears is the detective’s blank, pending until filled and then showing the word chosen. Connectors are not called out in Rookie at all, on the board or on the reveal.
  2. Rookie = the placement item. The loose sentence is exactly as printed. The clue is in the text and the board says nothing about it. Splice, cinch. The reveal explains why it goes there in prose and does not mark the connector.
  3. Detective = a two-part move, placement plus the transitions item. The misplaced sentence’s connector is blanked in place (“______, the team worked in strips…”). Place it on reference and logic alone, then fill the blank from four connectors in the test’s own vocabulary, vertical, A–D. The word prints into the sentence and becomes the tag on its thread. Wrong word: “Filed. Wrong word,” −20, The Mood explains why the wrong one felt right.
  4. Why the second beat is allowed to be four options. The spatial-world rule: the actual SAT question stays test-shaped. The blank-and-four-words is the transitions item verbatim in operation, so it keeps the test’s shape while the board around it stays a board.
  5. Catalog and cons. place-the-mark with a sentence as the mark; the fill is a second mark on the same artefact. Traps: W-PLACEMENT (no con yet) and W-TRANSITION-TONE (The Mood).