12/6/2023 0 Comments Sudoku diagonal rule![]() In regular sudoku there are no diagonal rules that state the two 9 cell diagonals must contain all the numbers. There are also two examples which show the pitfalls of Uniqueness strategies - and how they do not always apply in the case of Sudoku X. Does sudoku go diagonal The short answer is: no. Some of the basic strategies are illustrated after the examples and show how they can be extended to the diagonals. As the grade increases the diagonals contain much more important information. ![]() Gentle puzzles should require little to no note taking and can often be solved with normal ‘eye-balling’ techniques. This rule is in proportion to the difficulty. But to complete tough and harder puzzles the solver must be expected to use the extra diagonals. In Sudoku X all the normal Sudoku strategies apply - and there are a great number of these. Note, it is perfectly possible to create a normal Sudoku that co-incidentally has the unique 1 to 9 in each diagonal but unless this information is revealed first it is usually of no help to the solver. However, these extra constraints allow the puzzle compiler to reduce the number of necessary clues thus creating a balanced puzzle that rivals normal Sudoku in variety and difficulty. The puzzle solver can use this information to reduce the possibilities in those lines and make deductions across the the board previously out of reach in a normal Sudoku. In Sudoku X the two diagonals containing nine cells and sharing the central grid cell must also be filled with exactly 1 to 9. There are nine ‘cells’ in every row, column and box. In a normal Sudoku puzzle all rows, columns and 3x3 boxes must be filled with the numbers 1 to 9 without repeating a number. This is a variant of the popular Sudoku puzzle which contains two extra constraints on the solution, namely the diagonals, typically indicated by grey cells.
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