Sue de Coq
Level 9 · Purple Belt
Overview
Sue de Coq uses cells at the intersection of a box and line, combined with companion sets in the line and box. When candidates partition correctly, multiple eliminations become possible.
How It Works
- Find 2-3 cells at a box-line intersection containing N+2 candidates (forming an AALS).
- Find a companion set in the same line outside the box.
- Find another companion set in the same box outside the line.
- If candidates partition between intersection and companions, eliminate from other cells.
Example
Find the intersection of row 6 and box 5 (2 cells with 5 candidates).
1 / 5
Tips & Patterns
- Sue de Coq is elegant but rare.
- The intersection cells must share candidates with both companions.
- Eliminations can occur in both the line and the box outside the pattern.