Any takers? This one is rated “very hard” and I’m forced to agree. I can get this far (black is for the starting numbers; blue is for my contributions) without guessing. I still (naively?) believe it can be solved by logic alone, but the proof is in filling in the blanks ....
UPDATE (9/1/2006): Reader Janet G. reports that she has solved the Soduku puzzle without resorting to guessing. Congratulations!
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