This means that there are 81 cells to fill, and each row, column, and subgrid must still contain the digits 1 to 16 exactly once. date everything doug sudoku
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Pigeonhole Principle: If there are only two possible numbers left in a row, column, or subgrid, one of them must go in a specific cell. date everything doug sudokusudoku hint Place these numbers in the remaining cell of the rectangle, and eliminate the number from the other cells in the square. sudoku tips for new players Example: Consider the following Sudoku puzzle: +-------+-------+-------+ | 5 | 6 7 | 8 9 | | 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 | | 3 4 5 | 6 7 8 | 9 1 2 | +-------+-------+-------+ In this puzzle, we can identify an X-Wing pattern for the number 2 in columns 2 and 8.
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