Sudokus with an original rare shape

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

Postby JPF » Fri Jul 20, 2007 10:21 pm

claudiarabia wrote:
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

This pattern is not very new ; see this old post.
but your SE rating is smart.

Probably a nice pattern candidate for the Patterns game thread where you are welcome:)

JPF
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Isomorphic

Postby claudiarabia » Fri Jul 20, 2007 11:32 pm

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

SE rating of 7.2:) .....


JPF[/quote]
Oh, I totally forgot about these two precious gems. So consider my posting a hommage to your torchbearers. This one I will solve surely.

Claudia
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Posts: 288
Joined: 14 May 2006

anti-diagonal

Postby claudiarabia » Tue Jul 24, 2007 1:08 pm

This puzzle is a work of 2 Minutes. With SE 7.2 it is not to time-consuming in solving and I like the simple diagonal pattern because it looks so vivid.

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


Claudia
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Posts: 288
Joined: 14 May 2006

Re: anti-diagonal

Postby re'born » Tue Jul 24, 2007 1:55 pm

claudiarabia wrote:This puzzle is a work of 2 Minutes. With SE 7.2 it is not to time-consuming in solving and I like the simple diagonal pattern because it looks so vivid.

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


Claudia


Actually, despite the 7.2 rating, this seems to be a very tough nut to crack. In fact, this might be one of the hardest 7.2's I've seen (unless I'm missing something obvious). And you say that you constructed it in 2 minutes? Bravo, Claudia!:)
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Another very hard sudoku

Postby claudiarabia » Tue Jul 24, 2007 6:25 pm

This time double diagonal

SE. 9,3

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


Claudia
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Postby JPF » Tue Jul 24, 2007 9:30 pm

same type of pattern with 19 clues :

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


JPF
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Location: Paris, France

The late night sudoku

Postby claudiarabia » Tue Jul 24, 2007 11:18 pm

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


This Sudoku has SE-rating of 7,8. When I checked it, SE showed me in addition to the many forcing chains 5 Nishio-chains as the only multiple chains. Usually SE takes resort to Nishios only one or twice a puzzle. I would swallow a broom if you wouldn't find some empty rectangles instead like you did in the fantastic cycle-sudoku of JPF (SE 7,6)

@JPF: your 19-clue-Sudokus are fantastic.
@re'born: I will check the 7,2 puzzle, if it is really that difficult.

Claudia
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Posts: 288
Joined: 14 May 2006

Postby Mauricio » Wed Jul 25, 2007 2:47 am

18 clues puzzles allow nice patterns
Spaceship II
Code: Select all
+-------+-------+-------+
| . . . | . 1 . | . . . |
| . . . | . 2 . | . . . |
| . . 3 | . . . | 4 . . |
+-------+-------+-------+
| . . . | . 5 . | . . . |
| . . 4 | 3 . 6 | 7 . . |
| . 1 . | . . . | . 8 . |
+-------+-------+-------+
| . . . | 4 . 7 | . . . |
| . 2 . | . 8 . | . 1 . |
| . 8 . | . . . | . 3 . |
+-------+-------+-------+
Mauricio
 
Posts: 1174
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Postby wintder » Wed Jul 25, 2007 5:59 pm

Here is a symmetric 17 birdlike pattern. Easy puzzle though.:(
Code: Select all
. . .|. . .|. . 9
. . .|. . 3|. 1 .
. . 8|. . 2|. . .
-----+-----+-----
. . .|. . .|. 2 .
. . .|. . 8|4 . .
. 9 5|. 7 .|. . .
-----+-----+-----
. . .|. 9 .|. . 5
. 3 .|6 . .|. . .
2 . .|. . .|8 . .
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Posts: 297
Joined: 24 April 2007

Postby JPF » Wed Jul 25, 2007 7:52 pm

wintder wrote:Here is a symmetric 17 birdlike pattern. Easy puzzle though.:(
Code: Select all
. . .|. . .|. . 9
. . .|. . 3|. 1 .
. . 8|. . 2|. . .
-----+-----+-----
. . .|. . .|. 2 .
. . .|. . 8|4 . .
. 9 5|. 7 .|. . .
-----+-----+-----
. . .|. 9 .|. . 5
. 3 .|6 . .|. . .
2 . .|. . .|8 . .

This puzzle (an equivalent) has already been posted a while ago by Red Ed here :
Code: Select all
 *-----------*
 |...|...|..1|
 |...|..2|.3.|
 |..4|..5|...|
 |---+---+---|
 |...|...|.5.|
 |...|..4|6..|
 |.17|.8.|...|
 |---+---+---|
 |...|.1.|..7|
 |.2.|9..|...|
 |5..|...|4..|
 *-----------*

JPF
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Location: Paris, France

Re: anti-diagonal

Postby claudiarabia » Mon Jul 30, 2007 11:15 pm

re'born wrote:
claudiarabia wrote:This puzzle is a work of 2 Minutes. With SE 7.2 it is not to time-consuming in solving and I like the simple diagonal pattern because it looks so vivid.

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


Claudia


Actually, despite the 7.2 rating, this seems to be a very tough nut to crack. In fact, this might be one of the hardest 7.2's I've seen (unless I'm missing something obvious). And you say that you constructed it in 2 minutes? Bravo, Claudia!:)


You are totally right. The solving was much more complicated than the comstruction. But in the end it was worth it. In the end I needed 10 forcing chains in addition to the other techniques for solving it, while the explainer needed 21 chains. Interesting was the fact that I could use many trunks of forcing chains for new forcing chains eliminating candidates in the same way. And I found a forcing chain which showed that two numbers would have to be placed in one cell which is impossible. Usually I discover forcing chains, where some cells stay empty.
For the first time I found also a forcing chain which I could connect with an xyz-Wing which, at the end of the chain, eliminated a crucial candidate.

The cycles where almost the same which showed the explainer with a slight theoretical difference I will explain in a cycle thread another time.

Interesting also that the X-Wing I found is exactly the same like in the SE without knowing it's solution. I always thought in such complicated sudokus, ways differ much and it would be impossible that I come to the same X-Wing after 7 Forcing Chains and one Cycle.

Claudia
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Posts: 288
Joined: 14 May 2006

an anniversary sudoku

Postby claudiarabia » Wed Aug 08, 2007 3:06 pm

For my thread hit the 100 000 clickmark, I decided to make a very beautiful sudoku with 90°-rotational symmetry and 21 clues.
Code: Select all
9 . . . 3 . . . 5
. . 6 . . 1 . . .
. . . 7 . . . 8 .
. 1 . . . . 3 . .
3 . . . 2 . . . 9
. . 5 . . . . 7 .
. 7 . . . 8 . . .
. . . 5 . . 1 . .
2 . . . 6 . . . 4
SE 8.3

and here a sudoku with one more clue and much easier:
Code: Select all
9 . . . 3 . . . 4
. . 6 . . 1 . . .
. . . 5 . . . 8 .
. 1 . . 7 . 6 . .
5 . . . . . . . 9
. . 3 . 4 . . 7 .
. 8 . . . 7 . . .
. . . 6 . . 1 . .
2 . . . 9 . . . 5
SE 6.7

Claudia
Last edited by claudiarabia on Wed Aug 08, 2007 3:50 pm, edited 3 times in total.
claudiarabia
 
Posts: 288
Joined: 14 May 2006

again 21 clues

Postby claudiarabia » Thu Aug 09, 2007 1:32 pm

Code: Select all
9 . . . 3 . . . 6
. . 4 . . 1 . . .
. . . 7 . . . 2 .
. 1 . . . . 8 . .
3 . . . 4 . . . 9
. . 5 . . . . 7 .
. 7 . . . 8 . . .
. . . 5 . . 1 . .
2 . . . 6 . . . 4
The same pattern SE 8.9
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Posts: 288
Joined: 14 May 2006

Heart

Postby Mauricio » Thu Aug 09, 2007 5:45 pm

Some kind of heart
Code: Select all
 . . . . . . . . .
 . . . 1 . 2 . . .
 . . 1 . 3 . 4 . .
 . . 4 . . . 1 . .
 . . 5 . . . 3 . .
 . 2 . 6 . 7 . 8 .
 . . . . 5 . . . .
 . 7 . . . . . 6 .
 . 8 . . . . . 2 .
Mauricio
 
Posts: 1174
Joined: 22 March 2006

Re: Heart

Postby claudiarabia » Sun Aug 12, 2007 8:06 pm

Mauricio wrote:Some kind of heart
Code: Select all
 . . . . . . . . .
 . . . 1 . 2 . . .
 . . 1 . 3 . 4 . .
 . . 4 . . . 1 . .
 . . 5 . . . 3 . .
 . 2 . 6 . 7 . 8 .
 . . . . 5 . . . .
 . 7 . . . . . 6 .
 . 8 . . . . . 2 .

Whow, it reminds me of the 70's lamps with colored light. And last but not least a challenge to solve whereas the most 18s are very easy.

Here a sudoku with 21 clues and a known ground pattern
Code: Select all
. . . 9 5 . . . 2
. . 8 . . 1 . . .
. 6 . . . . 3 . .
7 . . . . . . 9 .
2 . . . 4 . . . 6
. 1 . . . . . . 5
. . 9 . . . . 1 .
. . . 2 . . 8 . .
5 . . . 7 4 . . .


Happy solving!

Claudia
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Posts: 288
Joined: 14 May 2006

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