Sparsest trivial 3x3 soduku?

Everything about Sudoku that doesn't fit in one of the other sections

Postby dukuso » Wed Nov 09, 2005 7:46 am

none of Gordon's 17s is solvable with naked singles alone.
The 18 was found after examining about 10million out of the
14million 18s by adding a clue to a 17.
So these are very rare and I was indeed surprised when it
popped up after 10mio examinations.

About half of the 17s can be solved with naked+hidden single,
which is also easy.
Hidden single is even easier usually as pointed out.
So you should try to solve my puzzle with
naked singles only.
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