printable 4x4 sudoku To solve a Sudoku puzzle, one must look for cells where only one number is possible, or rows/columns/blocks where a specific number has only one possible placement.
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These smaller grids are placed around the main grid, sharing parts of their rows, columns, and 3x3 subgrids. printable 4x4 sudokusudoku triples Start with the Most Constrained Rows and Columns : Focus on rows and columns with the fewest possible placements. sudoku washington Example: Consider the following Sudoku grid: +-------+-------+-------+ | 1 2 3 | 4 5 6 | 7 8 9 | | 4 5 6 | 7 8 9 | 1 2 3 | | 7 8 9 | 1 2 3 | 4 5 6 | +-------+-------+-------+ | 2 3 4 | 5 6 7 | 8 9 1 | | 5 6 7 | 8 9 1 | 2 3 4 | | 8 9 1 | 2 3 4 | 5 6 7 | +-------+-------+-------+ In this grid, we can apply the XYZ-Wing strategy to eliminate the number 2 from the first row, first column, and first box.
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