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Results 16 to 27 of 27
Thread: The secret of solving Sudoku
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19th June 2008, 11:14 AM #16
And for the competitive among us, this mornings (19/6) Herald Sun Sudoku - 15:45
There was a young boy called Wyatt
Who was awfully quiet
And then one day
He faded away
Because he overused White
Floorsanding in Canberra and Albury.....
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19th June 2008, 01:38 PM #17
Namtrak,
I also prefer to do Sudoku on paper rather than on a computer screen, so I print out this blank grid, to provide plenty of room for pencilmarks.
Rocker
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19th June 2008, 01:47 PM #18
That would have to be the hardest Sudoku I have ever seen!!!
There was a young boy called Wyatt
Who was awfully quiet
And then one day
He faded away
Because he overused White
Floorsanding in Canberra and Albury.....
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19th June 2008, 02:05 PM #19
and the easiest
Mick
avantguardian
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20th June 2008, 03:24 PM #20
I don't think you will be able to do this fiendish one without using forcing chains: http://www.sudokuoftheday.com/pages/...?day=1&level=4 . I managed it in about 30 minutes, but had to use that technique.
Rocker
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20th June 2008, 04:10 PM #21
12
I gotta get a lifeThere was a young boy called Wyatt
Who was awfully quiet
And then one day
He faded away
Because he overused White
Floorsanding in Canberra and Albury.....
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23rd June 2008, 01:51 PM #22
Yeah Dave, point taken!
However, like Namtrak says, I do them for fun, and not as some major challenge. Keeping the "Allow incorrect moves" unticked does not mean that I use it to solve by trial and error. It is mainly to pick up the "idiot factor" mismoves that crop up.
I also only do up to "HARD" usually, where it is very seldom that you need to go with forcing chains, as the logic methods of elimination are usually sufficient, 8 /10 times.
I don't take it seriously enough to put up with the frustration of proceeding through a further dozen moves, only to find a mistake. If that happens, I would usually laugh it off. As it is, if I get the dreaded flash of red, and it is not "finger trouble" I mentally write the result off, and finish the rest as an exercise only.
regardsAlastair
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7th July 2008, 06:23 PM #23
Did anyone do today's 'diabolical' sudoku from http://www.sudokuoftheday.com/pages/about.php ? I got a valid solution, but it differs somewhat from the solution given on that site for the puzzle. I though Sudokus were supposed to have a unique solution.
Rocker
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7th July 2008, 09:42 PM #24
I don't think that's necessarily true, although I'd be more inclined to believe it if it was actually stated. I've found at least one where a last empty pair could be interchanged. More than that would indicate something haywire in either the problem statement or my "solution," I think.
JoeOf course truth is stranger than fiction.
Fiction has to make sense. - Mark Twain
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8th July 2008, 08:51 AM #25
Joe,
It is actually stated in Sudopedia: "A well-formed Sudoku has a single solution that can be found by reasoning, regardless of the complexity of that reasoning."
My solution to the diabolical sudoku for July 7th is mostly the same as the solution given, but 13 cells differ; there are three digits transposed in rows 4, 6, and 7, and four digits transposed in row 5. In the columns, there are two digits transposed in columns 2 and 9, and three transposed in columns 4, 5, and 6.
Rocker
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8th July 2008, 10:41 PM #26
I mis-stated the anomaly I found. It was actually two empty pairs IIRC.
Consider a fragment:
x x x A x x B x x x
x x x Z x x C x x x
x x x B x x A x x x
A and B can be swapped willy-nilly from two remaining candidates without violating the requirements, as far as I can tell, but I might have to re-examine it if I can find it. The get-out-of-jail-free card is "well-formed." The puzzle-writing algorithm might have a hiccup; or not, of course.
I haven't visited the site in your link; too many other things on my Works-In-(non)Progress list.
JoeOf course truth is stranger than fiction.
Fiction has to make sense. - Mark Twain
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10th July 2008, 06:03 PM #27
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