The digit in any cell in Column 5 tells you which column in that same row contains the number 5 .
If you ever find two cells of the same color in the same unit (row, column, box) with the same candidate, you have a contradiction. If you find a cell that sees two different colors for the same candidate, that candidate can be eliminated. sudoku 129 better
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This guide will break down the core principles of the 129 system. You will learn how to read the board like a pro and drastically cut down your solve times. The Core Philosophy of Sudoku 129 Alternatively, the phrase is associated with , a