Sudokus with an original rare shape

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

Postby Mauricio » Mon Jun 11, 2007 1:09 am

(I do not know how to name these)

Edit: Names added

Some sort of urn.
Code: Select all
 . . . . . . . . .
 . 1 . 2 . 3 . 4 .
 . . 5 . 6 . 7 . .
 . . . . 8 . . . .
 . 4 . . . . . 3 .
 . 6 . . . . . 1 .
 . . 3 . . . 5 . .
 . 8 . 1 . 6 . 2 .
 9 . . . . . . . 6

Venetian masks (thanks ravel).
Code: Select all
 1 . . . . . . . 2
 . 3 . 4 . 5 . 6 .
 . . 4 . 7 . 8 . .
 . 1 . . . . . 5 .
 . 6 . . . . . 4 .
 . 7 . . 3 . . 2 .
 . . 8 . . . 7 . .
 . . . 6 . 2 . . .
 . . . . . . . . .   ER 7.3

Code: Select all
 1 . . . . . . . 2
 . 3 . 4 . 5 . 1 .
 . . 6 . . . 7 . .
 . . 4 . . . 8 . .
 . 9 8 . . . 5 3 .
 . . 3 . 7 . 4 . .
 . . 9 . . . 3 . .
 . . . 2 . 8 . . .
 . . . . . . . . .
Last edited by Mauricio on Mon Jun 11, 2007 2:30 pm, edited 1 time in total.
Mauricio
 
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Postby ravel » Mon Jun 11, 2007 9:34 am

Mauricio wrote:I do not know how to name these
Nice, how about Venetian masks ?
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Postby Mauricio » Tue Jun 12, 2007 7:34 am

Just some classic patterns (I'd think)

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

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


And some minimal 19's

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

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

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


And a nice 18 (go Havard!)
Code: Select all
 . . . . . . . . 1
 . . . . 2 . . 3 .
 . . 4 5 . 6 7 . .
 . . 5 . . . 6 . .
 . 3 . . 1 . . 8 .
 . . . 4 . 9 . . .
 . . 7 . . . 4 . .
 . 1 . . 8 . . . .
 . . . . . . . . .
Last edited by Mauricio on Tue Jun 12, 2007 4:53 am, edited 1 time in total.
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Again two snakes

Postby claudiarabia » Tue Jun 12, 2007 8:50 am

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


SE 8,3
If you change r7c1 from 5 to 1 you will get an ultra-easy sudoku SE 2,3.

Happy solving


Claudia
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Re: Again two snakes

Postby Mauricio » Tue Jun 12, 2007 9:09 am

claudiarabia wrote:SE 8,3


For some reasons snakes tend to be difficult puzzles.
Code: Select all
 . . 1 . . . . . .
 . 2 . . . 3 4 5 .
 . 5 . . 6 . . . 7
 . 6 . . . 5 . . .
 . . 3 . . . 2 . .
 . . . 8 . . . 9 .
 4 . . . 2 . . 3 .
 . 8 5 7 . . . 1 .
 . . . . . . 8 . .    ER 9.0

Code: Select all
 . . 1 . . . . . .
 . 2 . . . 3 4 5 .
 . 3 . . 6 . . . 7
 . 6 . . . 5 . . .
 . . 2 . . . 1 . .
 . . . 7 . . . 8 .
 5 . . . 9 . . 3 .
 . 4 8 1 . . . 2 .
 . . . . . . 7 . .    ER 9.1
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Re: Again two snakes

Postby m_b_metcalf » Tue Jun 12, 2007 1:14 pm

Mauricio wrote:For some reasons snakes tend to be difficult puzzles.

Yes, and sometimes they yield Pearls:
Code: Select all
 . . 1 . . . . . .
 . 4 . . . 7 8 5 .
 . 3 . . 9 . . . 6
 . 7 . . . 5 . . .
 . . 6 . . . 1 . .
 . . . 4 . . . 8 .
 5 . . . 6 . . 3 .
 . 9 3 1 . . . 2 .
 . . . . . . 9 . .     SE 6.7 Pearl

Regards,

Mike Metcalf
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Postby Mauricio » Tue Jun 12, 2007 3:17 pm

To JPF. Sorry for the random clues after the F, I could not eliminate it. Minimal.
Code: Select all
 . . . 1 . 2 3 . .
 . . . 4 . 5 . 6 .
 . 7 . 8 . 9 5 . .
 . . 5 . . 3 . . .
 . . . . . . . . .
 . 8 1 6 . . . 4 .
 . 2 . . . . . . .
 . 4 8 . . . . . .
 . 5 . . . . 9 . .
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Postby JPF » Tue Jun 12, 2007 6:58 pm

Mauricio wrote:To JPF. Sorry for the random clues after the F, I could not eliminate it. Minimal.

Thanks Mauricio:)

I'm sure the 2 random clues will be used in a next coming puzzle.

JPF
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Postby wapati » Tue Jun 12, 2007 8:40 pm

JPF wrote:
Mauricio wrote:To JPF. Sorry for the random clues after the F, I could not eliminate it. Minimal.

Thanks Mauricio:)

I'm sure the 2 random clues will be used in a next coming puzzle.

JPF


. . . . . . . . .
. . . . . . . . .
. . . . . . . . .
. . . . . . . . .
. . . . . . . . .
. . . . . . . 4 .
. . . . . . . . .
. . . . . . . . .
. . . . . . 9 . .
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Postby Mauricio » Tue Jun 12, 2007 8:52 pm

More on sudoku writing, now to Claudia

Code: Select all
 . . . . . . . . .
 . . 1 2 . 3 . . .
 . 2 . . . 4 . . .
 . . 3 5 . 6 4 . .
 . . . . . . . . .
 . . 7 . . . . . .
 . 6 . 8 . 7 . 1 .
 . 9 8 3 . 2 . 7 .
 . 5 . 4 . . 9 . .
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Postby m_b_metcalf » Wed Jun 13, 2007 5:41 pm

Mauricio wrote:More on sudoku writing,

... which gets tricky with so little spatial resolution. With 16x16 it gets better, as in this 'MIND THE GAP!' example:
Code: Select all
 3 . . . 4 . G . 6 . . 7 . 9 E .
 G A . 6 D . B . C F . E . 7 . 4
 B . 5 . E . 1 . 3 . 9 G . A . D
 E . . . 9 . F . 8 . . 1 . G . 3
 C . . . 1 . 6 . G . . 5 . B D .
 . . . . . . . . . . . . . . . .
 D 1 B G 7 . 3 . . 9 . 4 2 5 6 .
 6 . 4 . A . 5 . . 8 . B . . . .
 . . A . . . 4 F 1 G . 8 3 6 . .
 . . 2 . . . 9 . . A . C . . . .
 . . 6 . . . A . . 5 . D 4 C 7 .
 8 4 G 7 . . D B . . 3 9 A 1 . 2
 2 . . . . D . . 5 . E . . F . 6
 5 . 3 C . 9 E G 4 . B A 1 2 . 7
 4 . . 1 . A . . F . G . . . . .
 7 E F A . 5 . . 9 . 8 . . . . B

Regards,

Mike Metcalf

Edit: P.S. See also this.
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Postby claudiarabia » Fri Jun 15, 2007 6:59 pm

Mauricio wrote:More on sudoku writing, now to Claudia

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


Whow!

Before doing the second part, I want to present finally the sudoku with the 4 cornerboxes left with one middle seed. I was happy to need 22clues only.

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

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Postby JPF » Fri Jun 15, 2007 7:39 pm

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

SE=8.9 ; 21 clues

JPF
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Postby wintder » Fri Jun 15, 2007 9:09 pm

Nice puzzle jpf.

In the original r8c2 can be 9 or 8 as these are the only choices that keep the puzzle to 21 clues, with all other givens kept same.

There is one of the same rating and yet different path in this: (r5c5 changed)

Code: Select all
. . .|. . .|. . .
. 1 .|. 2 .|. 3 .
. . .|4 5 6|. . .
-----+-----+-----
. . 5|. . .|7 . .
. 3 7|. 9 .|6 2 .
. . 6|. . .|4 . .
-----+-----+-----
. . .|5 7 2|. . .
. 8 .|. 3 .|. 1 .
. . .|. . .|. . .
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Postby Mauricio » Fri Jun 15, 2007 9:19 pm

This pattern is not so nice, but is a new 17! It is number 40624.
Code: Select all
 . . . . . . . . 1
 . . . . . 2 . . .
 . . 3 . . 4 . . 5
 . . . . . 6 . 4 .
 . 7 . . . . . . .
 5 1 . . 7 . . . .
 . . . . 1 . 6 . .
 . . 4 . . . 2 . .
 8 . . 5 . . . . .

I post this just to let you know. I used a 1on/1off search starting from 33 random 21's and minimalizing the results. It took less than 1 hour.
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