Naked Pairs/ Twins

Naked Pairs / Twins

If there are two cells in a house (row, column or box) that have only 2 candidates, you can eliminate these 2 candidates from all the other cells in that house.

We have marked the pencil marks for row #8.

Take a look at R8C7 or R8C8, both in the same row and have only 2 candidates each.
Sudoku Naked Pairs

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