This occurs because a candidate can’t be the answer for two cells in the same region.Īs a result, all applicants with this color may be excluded. This color can’t be the solution if two Nodes in this sudoku Chain have the same color and fit into the same area (Column, Row, or Square). SIMPLE COLORING – More than once in a unit: So, unless all contenders of a similar hue are the answer at the same moment, they will not be the response. This is because one of the candidates is only present in one of two states. This approach looks at such sequences and displays those using colors that correspond to their names. If we imagine a longer Chain with just Strong Links, the Nodes will move from one state to another. If we assume that the candidate in the Cell at one end of a Chain is the response for that Cell, it will never be the solution for the middle Cell hence it must be dismissed. It has to be a good answer for the Chain’s next Cell.Īs a result, for the same reason, the candidate cannot be the resolution for the third Cell in the Chain. This is not the explanation for that Cell, which is the concept of a Strong Link that requires the candidate in the Cell at one end of the Chain. We can create a Chain of three Cells by placing the mutual Cell in the middle of two Strong Links that share a Cell. These two Cells are the only ones in the region where a single candidate is generally found.Īssume that if this candidate is not the resolution for Cell 1, it is the resolution for Cell 2, and vice versa. A Strong Link is a connection between two cells in a Sudoku region or area.
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