 not rendering a unique solution is four short of a full grid; if two instances of two numbers each are missing and the cells they are to occupy form the corners of an orthogonal rectangle, and exactly two of these cells are within one region, there are two ways the numbers can be assigned.  Since this applies to Latin squares in general, most variants of Sudoku have the same maximum.  The inverse problem—the fewest givens that render a solution unique—is unsolved, although the lowest number yet found for the standard variation without a symmetry constraint is 17, a number of which have been found by Japanese puzzle enthusiasts,[12][13] and 18 with the givens in rotationally symmetric cells.  Over 47,000 examples of Sudokus with 17 givens resulting in a unique solution are known.History[සංස්කරණය]Page from La France newspaper, July 6, 1895Number puzzles first appeared in newspapers in the late 19th century, when French puzzle setters began experimenting with removing numbers from ma