ColAUMS Space 2019 Issue 4

The Sudoku has been a puzzling staple since its introduction
in 1979. Most newspaper Sudokus will have around 25 clues –
pre-filled numbers – with more added as the difficulty decreases.
But if you have ever tried to generate a Sudoku on your own,
you may have wondered – what is the smallest number of clues
for the sudoku to be uniquely solvable?

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