Once the unavoidable sets are found, it is a much smaller-although still non-trivial-computing task to show that no 16-clue puzzle can hit them all. To prevent the unavoidable sets from causing multiple solutions, the clues must overlap, or 'hit', the unavoidable sets. The idea behind this was to search for what he calls unavoidable sets, or arrangements of numbers within the completed puzzle that are interchangeable and so could result in multiple solutions. So McGuire simplified the problem by designing a 'hitting-set algorithm'. A potential way to demonstrate that could be to check all possible completed grids for every 16-clue puzzle, but that would take too much computing time. Note: If we used numbers we would end up having to say things like in row 3 there is only one place. That led to the conjecture that 16-clue puzzles with unique solutions simply do not exist. GitHub - Magic-Fang/CSE6242-DataVisual-Analytics: Course Project & Assignment for Web Design, Data Analytics and Data Visualization. In this Sudoku grid row C (capital C) is highlighted. I have attempted to reset the app, clear the cashe, and unistall/reinstall to no avail. When I click on the Sudoku icon it opens the first screen, never advancing or loading the app. The clues are the numbers that are filled in to begin with, and enthusiasts have long observed that although there are some puzzles with 17 clues, no one has been able to come up with a valid 16-clue puzzle. NickHarrah Created on OctoSudoku wont load For the past few days, I have been unable to play Microsoft Sudoku.

The rules of Sudoku require puzzlers to fill out a 9X9 grid with the numbers 1–9 so that no digit is repeated within the same column, row, or 3X3 subgrid.

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