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Arctic Sudoku
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Medium

Naked pair

What it is

Two cells in a unit with the same two candidates – those digits can be removed from the rest of the unit.

How to spot it

Look for two cells in the same row, column or box whose notes are exactly the same two digits.

Example

112345678937371373824569
  • Basis
  • Removed / placed
r1c2 and r1c5 both hold only 3 and 7. One is 3 and the other 7, so 3 and 7 can be removed from r1c7 and r1c9.

Used from level: Medium