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The pencil marks method, also known as the marking technique or the "guess and check" method, involves temporarily marking potential candidates for each cell in a Sudoku puzzle. sudoku books target Example: Consider the following Sudoku grid: +-------+-------+-------+ | 1 | 3 4 5 | 6 7 8 | | 2 5 6 | 7 8 9 | 1 3 4 | | 3 4 7 | 1 2 5 | 8 9 6 | +-------+-------+-------+ | 4 6 8 | 9 1 2 | 3 5 7 | | 5 7 9 | 2 3 4 | 6 8 1 | | 6 8 1 | 4 5 7 | 2 9 3 | +-------+-------+-------+ In this grid, we can apply the XY-Wing strategy to eliminate the number 4 from the third row, third column, and third box. picture sudoku The NY Times Sudoku: The New York Times has been featuring Sudoku puzzles since 2004, providing readers with a daily challenge that tests their logic and problem-solving skills. sudoku subscriptionhard sudoku nyt A Brief History of Sudoku: Sudoku was first introduced to the Western world in 1979 by Nikoli, a Japanese puzzle company. picture sudoku Analyze Your Solutions: After solving a hard puzzle, review your approach and identify areas for improvement.
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