Pointing Pair
IntermediateUsed at: Medium
When a digit in a box appears only in one row (or column), it can be eliminated from that row (or column) in other boxes.
Pointing Pair — Explained
A Pointing Pair occurs when a digit within a box appears only in one row (or column). It can be eliminated from that row in adjacent boxes.
When to Use
Mid-game when candidates need narrowing. Pairs well with Box-Line Reduction.
Common Mistakes
Not checking whether the digit truly appears in only ONE row. Check carefully for scattered candidates.
Tips
Look for digits forming a straight line within a box. Horizontal = row, vertical = column eliminations.
Pointing Pair Steps
1
Find a box with a line
Find a digit whose candidates in a box are all in the same row or column.
2
Check adjacent boxes
Look in the same row/column of adjacent boxes.
3
Apply elimination
Eliminate the digit from that row/column in adjacent boxes.