Sudokus with an original rare shape

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

Postby JPF » Thu Jul 05, 2007 11:42 am

claudiarabia wrote:My new personal bestmark SE 9,5
Congratulations !
claudiarabia wrote:Never saw a rating with 33 Dynamic Contradiction Forcing Chains

I posted this puzzle here ; it's not Easter Monster
Code: Select all
 +-----------+
 |1..|...|..2|
 |..3|4..|.5.|
 |.6.|...|7..|
 |---+---+---|
 |...|85.|.9.|
 |...|3.6|...|
 |..8|.9.|...|
 |---+---+---|
 |.2.|...|1..|
 |7..|...|..6|
 |..9|.8.|.3.|
 +-----------+
SE=11.4 and 40 Dynamic Contradiction Forcing Chains.

In this thread (Sudokus with an original rare shape), aren't we off-topic with that ?
But, it's your thread:)

JPF
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another off-topic

Postby claudiarabia » Fri Jul 06, 2007 8:57 pm

JPF wrote:
claudiarabia wrote:Never saw a rating with 33 Dynamic Contradiction Forcing Chains

I posted this puzzle here ; it's not Easter Monster
Code: Select all
 +-----------+
 |1..|...|..2|
 |..3|4..|.5.|
 |.6.|...|7..|
 |---+---+---|
 |...|85.|.9.|
 |...|3.6|...|
 |..8|.9.|...|
 |---+---+---|
 |.2.|...|1..|
 |7..|...|..6|
 |..9|.8.|.3.|
 +-----------+
SE=11.4 and 40 Dynamic Contradiction Forcing Chains.

In this thread (Sudokus with an original rare shape), aren't we off-topic with that ?
But, it's your thread:)

JPF


Yes, it's my thread and because this was so nice here another off-topic-sudoku. "gg"

Did you ever see a sudoku SE 4.0 ? I didn't until today.

Do you know why it is 4.0? Because it has 4 Swordfishes, 4 Hidden Triplets and 1 Naked triplet.
Code: Select all
6 . . . 3 . . . 1
. 5 . 2 . 4 . 8 .
. . . . . . . . .
. 1 . 7 . . . 3 .
8 . . . 9 . . . 2
. 7 . . . 5 . 4 .
. . . . . . . . .
. 4 . 8 . 7 . 5 .
3 . . . 1 . . . 6
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Joined: 14 May 2006

Re: another off-topic

Postby daj95376 » Sat Jul 07, 2007 12:33 am

claudiarabia wrote:Do you know why it is 4.0? Because it has 4 Swordfishes, 4 Hidden Triplets and 1 Naked triplet.

It can also be solved using the following (as part of the solution):

Code: Select all
Hidden Pair   in: <45>, <47>, <57>
Naked  Pair   in: <47>

Hidden Triple in: <457> (*3)
Naked  Triple in: <457>

Swordfish     in: <4>, <5>, <7>

What a mix of techniques using the same three digits! Throw in the following for variety.

Code: Select all
Naked  Quad   in: <2369> (*2)
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Re: another off-topic

Postby ronk » Sat Jul 07, 2007 12:38 am

claudiarabia wrote:Did you ever see a sudoku SE 4.0 ? I didn't until today.

Do you know why it is 4.0? Because it has 4 Swordfishes, 4 Hidden Triplets and 1 Naked triplet.

I think a puzzle with just one hidden triple (and singles) would have the same rating. The weird thing is the hidden triple can't directly cause a hidden single ... cause that's rated a mere 2.5. Perhaps someone knows of such an example.

[edit: Although it also requires a hidden pair, here's one from the "Let's build a zoo" forum.]
Code: Select all
 . . . | . . . | 2 . 9
 5 . . | . . . | . 7 .
 . . 1 | 2 . 5 | 6 . 3
-------+-------+-------
 . . 2 | . . . | 5 . .
 1 . . | . . 3 | . . .
 . 6 . | . . . | 4 9 2
-------+-------+-------
 . 8 3 | . 6 . | . . .
 . . 4 | 3 7 . | . . .
 . . . | 4 . . | . . 7
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Postby JPF » Sat Jul 07, 2007 5:31 am

Nicolas Juillerat wrote:The difficulty of a Sudoku is rated by the hardest solving technique that is required to solve it. This is not necessary the best rating scheme,...

The rating 4.0 is related to a Hidden Triplet, not to a swordfish, rated 3.8
Eioru wrote:I try to find the best sample that means total of the methods rating is the highest than others. ver 1.0.9
This is my feel of the methods' score.(refer to Sudoku Explainer)
Code: Select all
1.0    Hidden Single ( 1.0,1.2,1.5 are the same )
1.7    Direct Pointing
1.9    Direct Claiming
2.0    Direct Hidden Pair
2.3    Naked Single
2.5    Direct Hidden Triplet
2.6    Pointing
2.8    Claiming
3.0    Naked Pair
3.2    X-Wing
3.4    Hidden Pair
3.6    Naked Triplet
3.8    Swordfish
4.0    Hidden Triplet
....

ronk wrote:I think a puzzle with just one hidden triple (and singles) would have the same rating. The weird thing is the hidden triple can't directly cause a hidden single ... cause that's rated a mere 2.5. Perhaps someone knows of such an example.

this is not uncommon with S.E. ; here's one example, among many others :
Code: Select all
 +-----------+
 |..1|...|2..|
 |.3.|4..|.5.|
 |6..|.2.|..7|
 |---+---+---|
 |...|...|.8.|
 |..6|.7.|1..|
 |.8.|...|...|
 |---+---+---|
 |5..|.1.|..6|
 |.9.|..5|.3.|
 |..2|...|4..|
 +-----------+

Sudoku Explainer wrote:Analysis results

Difficulty rating: 4,0

This Sudoku can be solved using the following logical methods:
60 x Hidden Single
1 x Hidden Triplet

JPF
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Postby Mauricio » Sun Jul 08, 2007 2:22 am

An spaceship, maybe?
Code: Select all
. . . . 1 . . . .
. . 2 . . . 3 . .
. 4 . . . . . 5 .
. . . 1 6 7 . . .
. . 3 . . . 4 . .
. . 8 . . . 5 . .
. . . 4 . 3 . . .
6 . . . . . . . 1
9 . . . . . . . 7


Addendum. Possibly this sudoku has been posted before and I used it as a seed to my list of 18's with rotational symmetry, or maybe not. Nonetheless it is very interesting, every row, column and box has exactly 2 clues, and it has double diagonal symmetry:
Code: Select all
. . .|. . 1|. 2 .
. 3 .|. . .|. . 4
. . 5|. 6 .|. . .
-----+-----+-----
. . .|2 . .|. . 3
. . 6|. . .|7 . .
1 . .|. . 8|. . .
-----+-----+-----
. . .|. 3 .|5 . .
2 . .|. . .|. 8 .
. 9 .|4 . .|. . .
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Here comes Ali - twice

Postby claudiarabia » Mon Jul 09, 2007 1:30 am

Code: Select all
. 9 . . . . 6 4 .
. . 1 . . 3 . . 7
. . . 8 . . 2 . 9
. . . . 4 . 8 . .
. . . 1 5 . 3 . .
. . 6 . . 9 . . .
2 . . 7 . . . . .
3 . . . 8 . . . .
. 4 5 6 . . . . .
This is Ali. It is very easy to discover his secrets. SE 2.6

Here is a more difficult Ali:
But I give you one clue more:
Code: Select all
. 2 . . . . 6 4 .
. . 1 . . 3 . . 7
. . . 8 . . 2 . 9
. . . . 4 . 8 . .
. . . 1 5 . 3 . .
. . 6 . . 9 1 . .
2 . . 7 . . . . .
3 . . . 8 . . . .
. 4 5 6 . . . . .
SE 6.6

Happy solving!

Claudia
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Posts: 288
Joined: 14 May 2006

Postby claudiarabia » Wed Jul 11, 2007 3:25 pm

Mauricio wrote:An spaceship, maybe?
Code: Select all
. . . . 1 . . . .
. . 2 . . . 3 . .
. 4 . . . . . 5 .
. . . 1 6 7 . . .
. . 3 . . . 4 . .
. . 8 . . . 5 . .
. . . 4 . 3 . . .
6 . . . . . . . 1
9 . . . . . . . 7

Code: Select all
. . .|. . 1|. 2 .
. 3 .|. . .|. . 4
. . 5|. 6 .|. . .
-----+-----+-----
. . .|2 . .|. . 3
. . 6|. . .|7 . .
1 . .|. . 8|. . .
-----+-----+-----
. . .|. 3 .|5 . .
2 . .|. . .|. 8 .
. 9 .|4 . .|. . .
A marvellous spaceship and a marvellous fly. I saw several sudoku of this fly-kind already in the forum.
I myself wanted to construct such a fly, but I ended up with 20 clues and ist was not even symmetric.

Here one bean for you to meet your hunger. Isn't that typical mexican?

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


Happy solving

Claudia
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Posts: 288
Joined: 14 May 2006

Some 90°rotational stuff

Postby claudiarabia » Tue Jul 17, 2007 9:48 pm

Code: Select all
7 . . 6 . . . . 3
. 2 . . 5 . . 1 .
. . 3 . . 8 7 . .
. . 9 . . . . . 2
. 1 . . . . . 5 .
4 . . . . . 9 . .
. . 7 9 . . 3 . .
. 6 . . 1 . . 4 .
5 . . . . 2 . . 8
SE 7.1

This time I work on 90°rotational-symmetric stuff.

Claudia
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Postby ravel » Wed Jul 18, 2007 2:28 pm

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

Code: Select all
 +-------------------+
 | . . . . . . . 3 8 |
 | . . 1 8 . . . 5 2 |
 | . 4 2 1 5 . . . . |
 | . 7 3 4 9 . . . . |
 | . . 4 2 . . . . . |
 | . . . . . . . . . |
 | . . . . . . 7 9 . |
 | 2 9 . . . . 3 . . |
 | 1 8 . . . . . . . |
 +-------------------+
ravel
 
Posts: 998
Joined: 21 February 2006

Postby claudiarabia » Wed Jul 18, 2007 8:52 pm

ravel wrote:
Code: Select all
 +-------------------+
 | . . . . . . . . 9 |
 | . . 1 7 . . 3 . . |
 | . 5 2 1 4 . . . . |
 | . 7 3 9 5 . . 2 . |
 | . . 4 3 . . . . . |
 | . . . . . . 1 . . |
 | 7 . . . 8 . . . 6 |
 | . . 5 . . . . . . |
 | . . . . . 6 . . . |
 +-------------------+

Code: Select all
 +-------------------+
 | . . . . . . . 3 8 |
 | . . 1 8 . . . 5 2 |
 | . 4 2 1 5 . . . . |
 | . 7 3 4 9 . . . . |
 | . . 4 2 . . . . . |
 | . . . . . . . . . |
 | . . . . . . 7 9 . |
 | 2 9 . . . . 3 . . |
 | 1 8 . . . . . . . |
 +-------------------+


Whow! Crucial clusters! I like the first one. Why? Because it looks like the cross is alone in the and the single seeds look so tiny and forlorn. Nice Idea!

Claudia
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Postby ravel » Fri Jul 20, 2007 7:41 am

Thanks,

its funny, i saw the cross as sun (heat wave here).

Code: Select all
 +-------------------+
 | . 6 8 . . . . . . |
 | 7 . . 6 . . 1 . . |
 | 1 . . 2 . 3 . 4 . |
 | . 7 3 . . 4 2 . . |
 | . . . . 8 . . . . |
 | . . 6 9 . . . . . |
 | . 9 . 1 . . 7 . . |
 | . . 5 . . . . . . |
 | . . . . . . . . 8 |
 +-------------------+ ER 6.6
ravel
 
Posts: 998
Joined: 21 February 2006

Great Joy - a long-yearned dream fulfilled itself!

Postby claudiarabia » Fri Jul 20, 2007 6:15 pm

Today I fulfilled a dream for myself. For the first time I generated an X-Shape-Sudoku with the 4 outer middle boxes with the middle clue only. My first selfmade sudoku was like this - with zillions of solutions - and a clue in r5c5.
Code: Select all
1 . . . . . . . 2
. 8 . . 3 . . 4 .
. . 7 . . . 5 . .
. . . 3 . 5 . . .
. 9 . . . . . 7 .
. . . 2 . 1 . . .
. . 6 . . . 1 . .
. 4 . . 8 . . 3 .
2 . . . . . . . 9

SE rating of 7.1:)

Happy solving

Claudia
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Posts: 288
Joined: 14 May 2006

And a nice fully-symmetric raute

Postby claudiarabia » Fri Jul 20, 2007 6:45 pm

Code: Select all
9 . . . 5 . . . 2
. . . 1 . 6 . . .
. . 8 . . . 4 . .
. 1 . . . . . 7 .
5 . . . 7 . . . 1
. 6 . . . . . 3 .
. . 4 . . . 8 . .
. . . 5 . 7 . . .
2 . . . 1 . . . 9
SE 9-5
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Postby JPF » Fri Jul 20, 2007 9:13 pm

claudiarabia wrote:Today I fulfilled a dream for myself.
Code: Select all
1 . . . . . . . 2
. 8 . . 3 . . 4 .
. . 7 . . . 5 . .
. . . 3 . 5 . . .
. 9 . . . . . 7 .
. . . 2 . 1 . . .
. . 6 . . . 1 . .
. 4 . . 8 . . 3 .
2 . . . . . . . 9

SE rating of 7.1:)


hm , this pattern is isomorphic to this one, already posted page 27 :
I wrote:
Code: Select all
 
 1 . . . 2 . . . 3
 . 4 . . . . . 5 .
 . . 6 . . . 7 . .
 . . . 6 . 2 . . .
 8 . . . . . . . 9
 . . . 3 . 4 . . .
 . . 7 . . . 4 . .
 . 5 . . . . . 6 .
 3 . . . 1 . . . 2


SE=9.3:)

happy solving !

JPF
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Location: Paris, France

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