Sudoku1 - Forcing Method
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Solve Method "Forcing Chain"

For a comprehensive reading, please refer to Sudoku1 Grid definitions.

 

This method allows to deduce the figure in a cell and also to exclude certain figures. It is also known as "double-involvement chains." This is a case where there N remaining candidates. We can set the first candidate and deducts some figures in nearby, then we do the same thing with the other candidates. At the end we compare the figures in other cells and if there is a cell where the same figure appeared, this figure is here.
Or if there are cells where possible is always cancelled.

This method could be used for difficult grid. It is selectable as Sudoku1 automatic solve methods in the Method panel by a click on Forcing. 

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