The New Sudoku Players' Forum

[Mauricio]

(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).

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 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 . . .
 . . . . . . . . .

[ravel]

I do not know how to name these

Nice, how about Venetian masks ?

[Mauricio]

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

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. . . . . . . . .
. . 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!)

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 . . . . . . . . 1
 . . . . 2 . . 3 .
 . . 4 5 . 6 7 . .
 . . 5 . . . 6 . .
 . 3 . . 1 . . 8 .
 . . . 4 . 9 . . .
 . . 7 . . . 4 . .
 . 1 . . 8 . . . .
 . . . . . . . . .


[claudiarabia]

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

[Mauricio]

SE 8,3

For some reasons snakes tend to be difficult puzzles.

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 . . 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

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 . . 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

[m_b_metcalf]

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

[Mauricio]

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 . .


[JPF]

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

[wapati]

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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. . . . . . . 4 .
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. . . . . . 9 . .

[Mauricio]

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 . .


[m_b_metcalf]

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.

[claudiarabia]

More on sudoku writing, now to Claudia

Code: Select all

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 . . 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

Claudia

[JPF]

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

[wintder]

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 .
. . .|. . .|. . .


[Mauricio]

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.