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Naked Twins

The Naked Twins method is one of the easiest higher methods. Using higher methods is worthwhile only when the two basic methods provide no further progress.

Since only the same two candidates are valid for these two fields, respectively, each of the fields must, of course, ultimately contain one of these candidates. The two candidates can therefore be deleted from all other fields of the logical unit.

In the picture the green highlighted fields are the source. The candidates 4 and 8 are a Naked Twin.

As a consequence, these two candidates can be deleted from the yellow fields.

Naked Twins are a special case of the Naked groups.

Sudoku example naked Twin

see also: Generalization : Naked groups



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