Two new puzzles: 1) Changing ONE AND ONLY ONE sign in the original puzzle (Fig 7 at http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html, is it possible to get another puzzle having again only one solution? 2) Changing ONE AND ONLY ONE sign in the original puzzle, is it possible to get another puzzle with more than one solution? I have the 2 answers, hoping that they are correct. Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de ed pegg Envoyé : jeudi 24 novembre 2005 21:20 À : math-fun Objet : Re: [math-fun] Problem Puzzler 1999 Christian, Yes, a spreadsheet with all solutions is near the bottom of my column. --Ed Pegg Jr --- Christian Boyer <cboyer@club-internet.fr> wrote:
Jean-Paul Delahaye publishes in the new issue of Pour La Science a very interesting article on Sudokus. He asked a very strange Sudoku problem WITHOUT any given numbers, only ">" and "<" signs between cells. He mentions that this problem was published in Puzzler, 1999, and that he does not know the solution.
I have the solution, sent this morning to J.-P. Delahaye.
Now looking for "Puzzler 1999" on Google, I find that Ed Pegg Jr. wrote an article in September 2005 including the same astonishing puzzle, figure 7 "Greater Than Sudoku" in:
http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html
Perhaps that somebody else had already the solution? Ed, did you receive a solution to your article?
Christian.
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