NOTES 21 9 SUDOKU. Sudoku enthusiasts would not forgive me if I move from the subject without giving a single Sudoku puzzle. Here is one kindly provided by Gordon Royle, University of Western Australia. It contains only 17 clues (filled squares), but is still deterministic, that is, can be filled in, in only one way. Apparently the existence of deterministic Sudoku puzzles with less than 17 clues is an open problem. 1 4 2 5 4 7 8 3 1 9 3 4 2 5 1 8 6
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