Firework

Firework uses a pivot cell at the intersection of a row and column, where a digit has strong links along both the row and column. The pattern forces the digit into specific cells, allowing eliminations elsewhere.

Technique

1. Find a pivot cell at the intersection of a row and column.
2. The digit must form a conjugate pair in the row (pivot + one cell) and column (pivot + one cell).
3. The digit must be in the pivot or in both endpoint cells.
4. Eliminate the digit from cells seeing both non-pivot endpoints.

Tips

• Firework patterns radiate from a single pivot point along a row and column - hence the name.
• The pivot is at the center, with 'sparks' along both lines.
• Look for digits with exactly 2 occurrences in both a row and column sharing a cell.