Mar 24, 2015 · simple coloring type 2. Hence the other color is the solution. This strategy looks for two cells of the same color in a colored tree of conjugate pairs in the same unit.
When to use simple coloring.
There are 2 blue cells in row 1, box 2 and column 5. Opposite colors in the same unit. When to use simple coloring. Now either all blue cells must contain digit 1 or all green cells.
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