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'''Sudoku-X''' is a well known [[Sudoku Variant]]. It is similar to a standard [[Sudoku]], but both [[diagonal]]s must also contain digits 1 through 9. Because the diagonals significantly reduce the number of [[Unavoidable Set]]s, the puzzle can contain less [[given]]s than a standard Sudoku. Also, the diagonals create opportunities for additional [[solving technique]]s, such as [[Skewed Fish]] ([[Triangular Connection]], [[Crossover]], [[Double Crossover]], [[Finned Double Crossover]], [[Skewed Swordfish]]), [[Multiple Crossover]], [[Weak Link Square]] and [[Skewed XY-Wing]]. The diagonal [[constraint]]s are also used in several other variants and sizes. For example, the [[Killer Sudoku]] variant can be combined with diagonal constraints to form [[Killer-X]]. A more extreme example would be [[Clueless]]-[[Shaolin]]-X. Below is one easy Sudoku-X puzzle. It requires only [[single]]s and one application of [[Naked Pair]]. [[Image:SudokuX.png]] == Minimum Number of Givens == ''Ruud'' has a [http://www.sudocue.net/minx.php collection] of Sudoku-X puzzles with as few as 12 [[given]]s. However, the actual minimum number of givens required for a valid Sudoku-X puzzle is not known. == See Also == * [[:Category:Sudoku-X]] * [[Windoku]] * [[Asterisk]] [[Category:Sudoku-X]] [[Category:Sudoku Variants]]

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