NOTES 21
9SUDOKU.
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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