Sudokus with an original rare shape

Everything about Sudoku that doesn't fit in one of the other sections

Postby wapati » Sun Mar 11, 2007 10:14 pm

JPF wrote:could be this one ?

Code: Select all
 . . . . . . . . .
 . . 1 2 . 3 4 . .
 . 5 . . . . . 6 .
 . 6 . . . . . 5 .
 . . 4 7 . 8 1 . .
 . 7 . . . . . 9 .
 . 9 . . . . . 3 .
 . . 8 4 . 9 7 . .
 . . . . . . . . .

JPF


This is cool, it reduces the entwined 8s to a seperated 8.

I quite like it !
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Re: benzol ring

Postby m_b_metcalf » Mon Mar 12, 2007 12:29 pm

claudiarabia wrote:This number-triple of r4c4, r5c5, r6c6 shapes many sudoku-patterns. It was my last resort moulding the Arabian-Star-puzzle.

And here's the same pattern less the triple:
Code: Select all
 . . . 5 . 9 . . .
 . 7 . . . . . 9 .
 4 . . . 8 . . . 1
 . . 5 . . . 2 . .
 1 . . . . . . . 7
 . . 9 . . . 6 . .
 8 . . . 3 . . . 4
 . 4 . . . . . 7 .
 . . . 9 . 2 . . .    SE 7.1

Regards,

Mike Metcalf
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Postby JPF » Sat Mar 17, 2007 10:03 pm

Code: Select all
 . . . . . . . . .
 . . 1 2 3 4 5 . .
 . 6 . . . . . 3 .
 . 7 . . . . . 4 .
 . . 5 . 1 . 6 . .
 . 8 . . . . . 9 .
 . 4 . . . . . 7 .
 . . 9 1 5 6 3 . .
 . . . . . . . . .


JPF
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Postby m_b_metcalf » Mon Mar 19, 2007 9:59 pm

Code: Select all
 5 . . . 4 . . . 1
 . 2 . . . . . 9 .
 . . 3 . 7 . 5 . .
 . . . . . 9 . . .
 1 . 8 . . . 4 . 3
 . . . 8 . . . . .
 . . 7 . 5 . 2 . .
 . 5 . . . . . 6 .
 4 . . . 3 . . . 8  SE 7.2

Regards,

Mike Metcalf

[Edit: A challenge, to generate a puzzle with this pattern but only one clue in the central box.]
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Postby JPF » Tue Mar 20, 2007 3:52 pm

Before Edit...

Code: Select all
 
 1 . . . 2 . . . 3
 . 4 . . . . . 5 .
 . . 6 . 1 . 7 . .
 . . . . . 5 . . .
 8 . 9 . . . 2 . 6
 . . . 9 . . . . .
 . . 1 . 3 . 4 . .
 . 3 . . . . . 7 .
 2 . . . 6 . . . 8   SE=8.9

Code: Select all
 1 . . . 2 . . . 3
 . 4 . . . . . 5 .
 . . 6 . 7 . 8 . .
 . . . . . 5 . . .
 3 . 1 . . . 2 . 6
 . . . 1 . . . . .
 . . 7 . 8 . 5 . .
 . 8 . . . . . 9 .
 4 . . . 6 . . . 1   SE=1.5
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a perfect rectangle

Postby claudiarabia » Wed Mar 21, 2007 2:46 pm

Code: Select all
. . . 6 5 . . . .
. . 2 . . 1 . . .
. 9 . . . . 4 . .
3 . . 7 . . . 1 .
4 . . . . . . . 5
. 7 . . . 2 . . 6
. . 1 . . . . 2 .
. . . 4 . . 8 . .
. . . . 3 7 . . .

Minimal, untouchable SE: 8,5

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Re: a perfect rectangle

Postby m_b_metcalf » Wed Mar 21, 2007 4:41 pm

claudiarabia wrote:
Code: Select all
. . . 6 5 . . . .
. . 2 . . 1 . . .
. 9 . . . . 4 . .
3 . . 7 . . . 1 .
4 . . . . . . . 5
. 7 . . . 2 . . 6
. . 1 . . . . 2 .
. . . 4 . . 8 . .
. . . . 3 7 . . .


Just tickle it a little, and, hey presto:

Code: Select all
 . . . 6 5 . . . .
 . . 7 . . 1 . . .
 . 9 . . . . 4 . .
 8 . . 7 . . . 1 .
 2 . . . . . . . 5
 . 4 . . . 2 . . 6
 . . 1 . . . . 2 .
 . . . 4 . . 8 . .
 . . . . 3 7 . . .  SE 9.0

Regards,

Mike Metcalf
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Postby JPF » Wed Mar 21, 2007 7:32 pm

claudiarabia wrote:Minimal, untouchable

Code: Select all
 . . . 1 2 . . . .
 . . 3 . . 4 . . .
 . 5 . . . . 3 . .
 6 . . . . . . 1 .
 2 . . . 5 . . . 7
 . 8 . . . . . . 4
 . . 1 . . . . 4 .
 . . . 2 . . 8 . .
 . . . . 9 1 . . .   

SE=1.5

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Re: a perfect rectangle

Postby m_b_metcalf » Thu Mar 22, 2007 1:09 am

m_b_metcalf wrote:Just tickle it a little, and, hey presto:

And another little tickle:

Code: Select all
 . . . 6 5 . . . .
 . . 7 . . 1 . . .
 . 9 . . . . 4 . .
 8 . . 3 . . . 1 .
 2 . . . . . . . 5
 . 4 . . . 2 . . 6
 . . 1 . . . . 2 .
 . . . 4 . . 8 . .
 . . . . 9 7 . . . SE 9.2

Regards,

Mike Metcalf
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Postby m_b_metcalf » Thu Mar 22, 2007 1:30 pm

JPF wrote:
claudiarabia wrote:Minimal, untouchable

SE=1.5

Here's another 'broken' one (not as pretty as JPF's):
Code: Select all
 . . . 2 5 . . . .
 . . 6 . . 1 . . .
 . 9 . . . . 4 . .
 8 . . 3 . . . 1 .
 9 . . . . . . . 5
 . 3 . . . 2 . . 6
 . . 1 . . . . 2 .
 . . . 4 . . 8 . .
 . . . . 9 . . . . .SE 7.2

and one with highly symmetric clue values (see the sequences 6514156 and 7941497, as well as the 33 and 22 - only a 2 and 5 are not in a symmetric pattern):
Code: Select all
 . . . 6 5 . . . .
 . . 2 . . 1 . . .
 . 3 . . . . 4 . .        [Edit: a yet more symmetric puzzle]
 7 . . 3 . . . 1 .
 9 . . . . . . . 5
 . 4 . . . 2 . . 6
 . . 1 . . . . 5 .
 . . . 4 . . 2 . .
 . . . . 9 7 . . .  SE 7.2

Regards,

Mike Metcalf
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Postby JPF » Fri Mar 23, 2007 7:33 am

Code: Select all
 
 1 . . . 2 . . . .
 . 3 . 4 . 1 . . .
 . . 5 . . . 6 . .
 . 1 . . . . . 2 .
 2 . . . . . . . 7
 . 4 . . . . . 5 .
 . . 6 . . . 1 . .
 . . . 7 . 8 . 9 .
 . . . . 9 . . . 2
easy

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Postby m_b_metcalf » Fri Mar 23, 2007 3:43 pm

JPF wrote:easy

JPF

This one would appear to have only 2 near neighbours in sudoku space:!:

Regards,

Mike Metcalf
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Postby JPF » Sat Mar 24, 2007 9:18 pm

a planetary system with 18 planets :

Code: Select all
 . . . . 1 2 3 . .
 . . . 4 . . . . .
 . . 5 . . . . . 6
 . 2 . . . . . . 7
 3 . . . 8 . . . 9
 7 . . . . . . 6 .
 4 . . . . . 2 . .
 . . . . . 9 . . .
 . . 9 6 7 . . . .

6.8 light-years

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Postby JPF » Tue Mar 27, 2007 7:05 am

19s puzzles :

Code: Select all
 1 . . . . . 2 . .
 . 3 . . . 4 . . .
 . . 4 . 5 . . . 6
 . . . 2 . . . 3 .
 7 . . . . . 1 . .
 . 8 . . . 6 . . .
 . . 2 . . . 5 . .
 . . . 1 . . . 6 .
 . . . . 2 . . . 7


Code: Select all
 1 . . . . . . . .
 . 2 . . . 3 . . .
 . . 4 . 5 . . . .
 . . . 2 . . . 6 .
 . . 7 . . . 4 . .
 . 3 . . . 5 . . .
 6 . . . 4 . 7 . .
 . 8 . 9 . . . 2 .
 . . 5 . . . . . 3


Code: Select all
 1 . . . . . 2 . .
 . 3 . . . 4 . . .
 . . 5 . 6 . . . 7
 . . . . . . . 3 .
 . . 4 . 2 . 5 . .
 . 8 . . . . . . .
 2 . . . 8 . 3 . .
 . . . 2 . . . 4 .
 . . 6 . . . . . 5


Code: Select all
 . . . . . . . . .
 . . . 1 . 2 3 . .
 . . 4 . . . . 5 .
 . 1 . 6 . . . 4 .
 . 2 . . 7 . . 8 .
 . 3 . . . 9 . 2 .
 . 7 . . . . 2 . .
 . . 8 4 . 5 . . .
 . . . . . . . . .


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Postby m_b_metcalf » Wed Apr 11, 2007 7:31 pm

When investigating the 'Cross plus 4 dots' pattern brought up on the How regular is to generate sudoku with difficulty 9+ SE? thread, I was surprised to find that my program, working in a particular mode, generated puzzles always with the central point redundant. An example is:
Code: Select all
 4 . . . 2 . . . 6
 . 5 . . . . . 8 .
 . . 3 . . . 9 . .
 . . . 1 . 5 . . .
 9 . . . 0 . . . 4
 . . . 6 . 8 . . .
 . . 1 . . . 5 . .
 . 8 . . . . . 7 .
 6 . . . 3 . . . 2

This is SE 7.1 (I deleted a 9.1 by mistake:( ). Given how hard it usually is to generate 20-clue puzzles, I thought this might be of interest.

Regards,

Mike Metcalf
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