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Intersection Removal

Intersection Removal is an advanced technique which can eliminate certain candidates from squares.

Sudoku Image

Using 'Show squares with a...' and selecting <2>, it is clear that the <2> in Block3 must be in C9, therefore R5C9 cannot be a <2>.

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Using 'Show squares with a...' and selecting <3>, it is clear that the <3> in Block4 must be in R5, therefore all remaining <3> can be removed from R5.

Sudoku Image

Using 'Show squares with a...' and selecting <8>, it is clear that the <8> in C9 must be in Block3, therefore all remaining <8> can be removed from Block3.


 

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