The two messages below were trapped by the mailing list filter. As usual, I can't figure out why. I've inverted the order, since Paul Payton's message has a spoiler. --Rich -------- Date: Mon, 15 Feb 2010 15:45:11 -0800 Subject: Re: [math-fun] a difficult sudoku From: Nick Baxter <nickb@baxterweb.com> To: ms@alum.mit.edu, math-fun <math-fun@mailman.xmission.com> 2.1 unnamed [text/html] 2.34 KB Download This puzzle is "well known" and even has a name: AI Escargot. It was created about three years ago by Arto Inkala, and got some press for having the highest difficulty rating at some sudoku web site. Actually, the 1 in the lower-left box should not be there. Either way, it has a unique solution. Nick Mike Speciner wrote:
It has multiple solutions, so does it count?
--ms
On 2/15/2010 2:55 PM, Simon Plouffe wrote:
Hello,
here is a sudoku for the amateurs,
+-------+-------+-------+ | 1 . . | . . 7 | . 9 . | | . 3 . | . 2 . | . . 8 | | . . 9 | 6 . . | 5 . . | +-------+-------+-------+ | . . 5 | 3 . . | 9 . . | | . 1 . | . 8 . | . . 2 | | 6 . . | . . 4 | . . . | +-------+-------+-------+ | 3 . . | . . . | . 1 . | | . 4 1 | . . . | . . 7 | | . . 7 | . . . | 3 . . | +-------+-------+-------+
apparently the is one of the toughest there is.
- can anyone do this ?
Simon Plouffe
<boilerplate trimmed -- rcs> ---------------- <spoiler space> x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x xx x x xx x x x x x x x x x x x x x x x x x x x x x x x x x Date: Mon, 15 Feb 2010 13:05:53 -0700 Subject: RE: [math-fun] a difficult sudoku From: "Payton, Paul" <paul.payton@lmco.com> To: "'math-fun'" <math-fun@mailman.xmission.com> 2 unnamed [multipart/signed] 14.93 KB Download 1 6 2 | 8 5 7 | 4 9 3 5 3 4 | 1 2 9 | 6 7 8 7 8 9 | 6 4 3 | 5 2 1 -------+-------+------ 4 7 5 | 3 1 2 | 9 8 6 9 1 3 | 5 8 6 | 7 4 2 6 2 8 | 7 9 4 | 1 3 5 -------+-------+------ 3 5 6 | 4 7 8 | 2 1 9 2 4 1 | 9 3 5 | 8 6 7 8 9 7 | 2 6 1 | 3 5 4 -----Original Message----- From: math-fun-bounces@mailman.xmission.com [mailto:math-fun-bounces@mailman.xmission.com] On Behalf Of Simon Plouffe Sent: Monday, February 15, 2010 11:56 AM To: math-fun Subject: [math-fun] a difficult sudoku Hello, here is a sudoku for the amateurs, +-------+-------+-------+ | 1 . . | . . 7 | . 9 . | | . 3 . | . 2 . | . . 8 | | . . 9 | 6 . . | 5 . . | +-------+-------+-------+ | . . 5 | 3 . . | 9 . . | | . 1 . | . 8 . | . . 2 | | 6 . . | . . 4 | . . . | +-------+-------+-------+ | 3 . . | . . . | . 1 . | | . 4 1 | . . . | . . 7 | | . . 7 | . . . | 3 . . | +-------+-------+-------+ apparently the is one of the toughest there is. - can anyone do this ? Simon Plouffe <trailer clipped --rcs>