![]() ![]() There are five other Sudoku preserving transformations: row permutations within a band, column permutations within a stack, band permutations, stack permutations, and "reflection, transposition or rotation" (the later includes three transformations within a single class). One example of a transformation is a permutation of the digits (such as changing all digits from "123456789" to "234567891"). Transformation – A manipulation of a Sudoku (or its grid) where it is changed or transformed into an essentially equivalent Sudoku.In technical use the term is avoided because of ambiguity with boxes. Square – Another word for a cell of a Sudoku.Also refer to automorphic for a type of symmetry where the digits (not just their positions) play a role in another type of symmetry. In addition, groups of clues can display other types of symmetry, such as translational symmetry. reflection symmetry on two diagonal axes.reflection symmetry on one diagonal axis.reflection symmetry on two orthogonal axes.reflection symmetry on one orthogonal axis.Symmetry – A Sudoku can have seven types of overall symmetry in its clue positions.Translational symmetry (each clue group takes the form n, n+1, n+2, n+3), (24 clues). Size – Refers to the size of a puzzle or grid, and can be described as a composite (i.e.Note: the level of trial and error is usually not explicitly defined. Satisfactory puzzle – A puzzle that does not require trial and error (guessing).In some variants regions are not equally shaped. Region – Another term for the boxes of a Sudoku.Sudokus are always expected to be proper Sudokus unless the puzzle setter specifies otherwise. Proper Sudoku – A Sudoku with one solution.In some variants nonets are not equally shaped. ![]() Nonet – Another term for the boxes or regions of a Sudoku.(See Mathematics of Sudoku – Minimum number of givens for details). Minimum number of clues – Refers to the minimum of all proper Sudokus.Different minimal Sudokus can have a different number of clues. Minimal – A minimal Sudoku (or irreducible Sudoku) is a Sudoku from which no clue can be removed leaving it a proper Sudoku (has one solution).Latin square – A related puzzle, or number array, with only row and column constraints (omitting the box constraint).In large Sudokus, such as "Sudoku the Giant", elements may be alphanumeric, or a larger set of numbers, e.g. This term is often used in a mathematical context, especially for Sudokus larger than 9×9, when more than nine digits "1-9" are required. Element – A digit or number of the Sudoku.Constraints – The rules of a Sudoku that require each digit to appear only once in each row, column, and box.In solving most Sudokus, this is usually a poor approach, but in the most difficult examples may be necessary. backtracking) and making a different guess. In the manual form, it indicates the effort of making a guess, and if found to be wrong, going back (i.e. Backtracking – A programming method to solve Sudokus, but can also describe a manual method.Automorphic – A property of some Sudokus where the digits (not just their positions) play a role in a type of symmetry. ![]()
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