This strategy looks for two cells of the same color in a colored tree of conjugate pairs in the same unit. The cells tagged with a 'A', 'C', 'E' and 'D' would have been enough of a tree in this particular case. You might notice the whole tree was not needed to make this deduction. If the value 4 is in the green cells there will be a 4 in column 2 in the cell tagged with a 'D' so the value 4 cannot be in the grey cell in column 2.Įither way, the value 4 cannot be placed in the grey cell so it can be removed from the candidates. If the value 4 is in the blue cells then there will be a 4 in row 5 in the cell tagged with an 'A' so the value 4 cannot be in the grey cell in row 5.
This strategy does not determine if the value 4 will be in the blue or the green cells but it does mean the value 4 cannot be in the grey cell. The conjugate pair chain properties mean all the green cells need to contain the value 4 or all the blue cells need to contain the value 4. The grey cell is in the same row as the blue cell tagged with an 'A', and in the same column as the green cell tagged with an 'D'. Continue this process until no more pairs can be found.Īll other cells that can contain the value 4 can now be checked for a cell from the tree of each color in the same unit. One of these cells is already blue so color the other cell tagged with a 'D' green. Using the blue cell tagged with an 'E', another conjugate pair, the cells tagged with an 'E' and a 'D' can be found in row 9. One of these cells is already green so color the other cell tagged with an 'E' blue. Using the green cell tagged with a 'C', another conjugate pair, the cells tagged with a 'C' and an 'E' can be found in box 8. To create the tree one cell of the first conjugate pair is colored blue and the other cell is colored green.Īssume the first conjugate pair found was the two cells tagged with an 'A' and a 'C' in column 6. In each case, the value 4 only exists in two cells of a unit. The Simple Coloring Type 1 example in Figure 1 shows a colored tree of conjugate pairs based on the value 4. This strategy looks for a cell in the puzzle that is not in the conjugate pair tree but is in the same unit as a cell of each color in the colored tree of conjugate pairs. Try Smart Solver now.Simple Coloring Type 1. You may learn Sudoku solving techniques through examples with numerous puzzles from our database. Our new smart solver not only gives the solution for a puzzle, but also explains every step with demonstrations in the grid.
#Easy online color sudoku Pc
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