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Strategic Sudoku Solving: Analyzing Rows, Columns, and Boxes

This guide provides insights into solving Sudoku puzzles by emphasizing the importance of examining rows, columns, and 3x3 boxes. We explore how the number 5 can be strategically placed within the grid, particularly focusing on row and column constraints. By analyzing the existing numbers and their placements, we'll derive logical steps for filling in missing values like the number 2 in central rows. Follow this systematic approach to effortlessly fill numbers and enhance your Sudoku-solving skills with clear strategies and techniques.

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Strategic Sudoku Solving: Analyzing Rows, Columns, and Boxes

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  1. Examining the top three rows first The number 5 appears in row one and row three. Row two requires a 5. It has to be located in the middle 3x3 box. Two possible locations for 5 in centre box The centre column already has one 5 so it cannot be above the 8. Thus, it has to be above the 9 on the second row

  2. Examining the top three rows first: 5 appears in row one and row three. Row two requires a 5. It has to be located in the middle 3x3 box. Two possible locations for 5 in centre box The centre column already has one 5 so it cannot be above the 8. Thus, it has to be above the 9 on the second row

  3. Now scan down the three central columns:

  4. Now scan down the three central columns: The second and third columns already have the number 5 - but the first column also needs a 5. A 5 has to be located in the lower 3x3 grid box as the two above already have 5 in them. The bottom row of nine boxes has a 5 already so it cannot go in row 9. Thus, 5 has to go just above the 2 on the first row of the lower middle 3x3 grid box.

  5. Now examine the central three rows - row 4 to row 6. The number 2 appears in rows 5 and 6 but not in row 4 ? Fill in the number 2 in row 4 of the central 3x3 grid box. But Column 4 has a 2 already Thus, the 2 in row 4 has to go above the 4 in the central box

  6. Now examine the central three rows - row 4 to row 6. The number 2 appears in rows 5 and 6 but not in row 4 Fill in the number 2 in row 4 of the central 3x3 grid box. But Column 4 has a 2 already Thus, the 2 in row 4 has to go above the 4 in the central box

  7. Continue scanning across and down the columns and grids filling in the ‘easy’ numbers. It can help to systematically go through the numbers 1 to 9 in sequence for each horizontal and vertical group of three sub-grids.

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