Grouped X-Cycles
Extreme
Used by Smart Hint
X-Cycles generalized so a "node" can be a group of cells confined to one row-and-box or column-and-box intersection, not just a single cell.
- First colour in the chain
- Second colour in the chain
- Where the conclusion lands
- Candidate ruled out
How it works
- A1 and B1 together form a group node for digit 6 — both confined to row 1's leftmost box — linked by a strong link to G1 the same way a single cell would be in a plain X-Cycle.
- The rest of the loop proceeds exactly like X-Cycles, just treating that box-confined group as one link endpoint instead of a single cell.