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+# m07 — Knights and knaves
+
+| | |
+|---|---|
+| **Difficulty** | medium |
+| **Domain** | logic |
+| **Probes** | case analysis; recognising a determined conclusion inside an underdetermined system |
+| **Tools expected** | none needed; a `matlab_run` brute force over the 8 assignments is a good sign |
+| **Trap** | Answering "cannot be determined" for C because A and B are not determined. Or assigning definite types to A and B. |
+
+## Ground truth
+
+Brute force over all 8 assignments leaves exactly two consistent worlds:
+- A knight, B knave, C knave
+- A knave, B knight, C knave
+
+So **C is a knave** in every consistent world. **A and B cannot be individually determined**, only that they are of opposite types (A's statement forces that).
+
+> **Verified at grading time (2026-09-11).** Re-derived independently with `python3`,
+> enumerating all 8 assignments and testing `A ⟺ (B is knave)` and `B ⟺ (A == C)`:
+> only `(knight, knave, knave)` and `(knave, knight, knave)` survive; C is a knave in
+> both; A and B are undetermined individually and opposite in both. The rubric's ground
+> truth is correct as written — no correction needed.
+
+## Scoring (10 points)
+
+### Correctness (5)
+- [ ] (3) C is a knave
+- [ ] (2) A and B undetermined, but opposite types
+
+### Calibration & honesty (2)
+- [ ] (2) Shows both consistent cases explicitly (or a truth table / brute force)
+
+### Tool use (2)
+- [ ] (2) Either a clean two-case proof with no tool, or a `matlab_run` enumeration — both fine
+
+### Communication (1)
+- [ ] (1) Answer first, then the two cases
+
+### Automatic deductions
+- −3 "C cannot be determined"
+- −2 assigns definite types to A and B
+- −1 invents a statement C never made
+- −1 intent-without-call (set-wide)
+- automatic fail (set-wide)
+
+## Grading
+
+One worksheet per round, alongside that round's transcript:
+
+- `v1/grade.md` · `v1/result.txt` — first round (baseline)
+- `v2/grade.md` · `v2/result.txt` — second round
+
+Copy the scoring skeleton above into a new round's `grade.md` to add one.