Hulver's site || Sudoku

Sudoku

No	4 votes - 40 %
I don't see the attraction	2 votes - 20 %
Boring	1 vote - 10 %
Meh	1 vote - 10 %
Sometimes	2 votes - 20 %
A lot	0 votes - 0 %
Every spare minute	0 votes - 0 %
I is teh l33t sudoku ninja!	0 votes - 0 %

10 Total Votes

A Day in the Life | 11 comments (11 topical, 0 hidden) | Trackback

My wife uses that technique by TPD

(2.00 / 0) #1 Thu Apr 26, 2007 at 04:26:17 AM EST

but when she explained it, she explained it really poorly.

She's a bit of an addict - there's a daily sudoku here: http://www.guardian.co.uk/sudoku

Rock Hard Abs are just a sw-sw-swivel away!

: I'm reasonably sure by skippy (2.00 / 0) #9 Thu Apr 26, 2007 at 09:28:59 AM EST

that my brain is using the same method - but I wouldn't have been able to explain it.
"You know, I just find like the patterns of numbers and stuff? And then I put in the numbers in the boxes when I figure it out."

[ Parent ]

Got any play online Killer sites? by ambrosen (2.00 / 0) #2 Thu Apr 26, 2007 at 05:03:54 AM EST

As an amateur Sudoku guy . . . by slozo (2.00 / 0) #3 Thu Apr 26, 2007 at 05:43:11 AM EST

. . . I am confused with your first example: You state that for two boxes, we have 5 and 6. Yet in the left center box, there are clearly three possibilites for 5 and 6 . . . your example of uniqueness forgets that 7 could have also gone in the top left hand corner of that same box. Hence, it is a bad example perhaps?

That being said, I have used your uniqueness technique a few times myself with success.

The issue is that by ambrosen (4.00 / 1) #4 Thu Apr 26, 2007 at 06:12:42 AM EST

in the bottom left square, there's a pair of boxes that have to be 5 or 6, and in the middle left square, directly above that, there's one box that's also 5 or 6, and the one that's 5, 6 or 7.

If all four of those boxes contained just 5s and 6s, then the puzzle would be ambiguous, because you wouldn't be able to tell which column had the 5 above the 6 and which had it below, so the one box that contains a third option must be filled with that to make the puzzle solvable.

And yes, Mr Canine did explain better than me.

[ Parent ]

: Exactly. by ReallyEvilCanine (2.00 / 0) #7 Thu Apr 26, 2007 at 07:30:10 AM EST

Maybe I should call this "Disambiguity" rather than "Uniqueness".

[ Parent ]
: ah, I see now . . . by slozo (2.00 / 0) #8 Thu Apr 26, 2007 at 08:34:48 AM EST

. . . the third suare doesn't come into play, right. Fair enough. BTW - I never knew about the "two possible solutions makes it illegal" thing . . .

[ Parent ]

sudoku techniques by Merekat

(3.00 / 1) #5 Thu Apr 26, 2007 at 06:52:04 AM EST

Am I missing something or isn't it just a series of varyingly complex simultaneous equations?

: It's not really simultaneous equations. by ambrosen (2.00 / 0) #6 Thu Apr 26, 2007 at 06:55:49 AM EST

They're more basic elimination problems. But I like them for keeping the brain working.

[ Parent ]

To irk my wife by sasquatchan (2.00 / 0) #10 Fri Apr 27, 2007 at 06:43:00 AM EST

I wrote a brute force sudoku solver. Was from the math challenge web site (now the Euler project web site). Re wrote it a few times to brute force depth/breadth first, from 0,0 or 9,9, and one that just does simple iterative "fill in the obvious". Though "fill in the obvious" only completes easy puzzles. Was an interesting exercise, but didn't bother making it 'smarter' for better set elimination.

How long has the <small> tag worked here? by ammoniacal (2.00 / 0) #11 Sat Apr 28, 2007 at 08:57:21 AM EST

It was an unholy union of text and pulped wood that the Ancients used to distribute their blogs.

A Day in the Life | 11 comments (11 topical, 0 hidden) | Trackback


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