Sodoku unsolvable

I came across a page from The Cord dated 2009-01-20 that had the Classifieds and a puzzle. After some study, I realized that it does not have a unique solution.

If pursued to the limit without guessing at any squares, all cells can be filled in except for four, namely the intersection of rows 4 and 9 with columns 8 and 9, and these four cells all have the same possibilities for completion, both 5 and 9, each.

I suggest that the puzzle with a 9 in Row 4, Column 9 is the more interesting of the two.

–Leroy J. Dickey

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