Sudokus with an original rare shape

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

a permutation

Postby claudiarabia » Sun Sep 10, 2006 12:43 am

ronk wrote:A spider maybe ...

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

A very difficult spider BTW.


Be it a permutation. It's a very refined one. It still takes efforts to carve out a new pattern out of an old grid. Mostly you have to change some clues anyway to generate a valid solution.

Claudia
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Re: a permutation

Postby udosuk » Sun Sep 10, 2006 4:36 am

claudiarabia wrote:It still takes efforts to carve out a new pattern out of an old grid. Mostly you have to change some clues anyway to generate a valid solution.

Really? I thought by permutating a valid puzzle you get another valid puzzle automatically...:?:
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Re: a permutation

Postby fermat » Sun Sep 10, 2006 4:41 am

udosuk wrote:
claudiarabia wrote:It still takes efforts to carve out a new pattern out of an old grid. Mostly you have to change some clues anyway to generate a valid solution.

Really? I thought by permutating a valid puzzle you get another valid puzzle automatically...:?:


Permutations do not change the puzzle, true.
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A snake

Postby claudiarabia » Mon Sep 11, 2006 2:06 pm

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


claudia
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Postby JPF » Mon Sep 11, 2006 4:23 pm

I like the sub-patterns.
Code: Select all
 . . . . 9 8 7 . .
 . . . 3 . . . 6 .
 . . 7 . . . . . 5
 . . 4 . . . . . 1
 . . . 2 3 7 . . .
 6 . . . . . 3 . .
 3 . . . . . 9 . .
 . 5 . . . 1 . . .
 . . 2 5 8 . . . .


Claudia,
What is interesting in this one, is that you can choose 3 numbers in r9c5...
You get very different puzzles .
Code: Select all
r9c5   ER

4      7.4
6      2.6
8      8.3 

JPF
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Postby Eioru » Tue Sep 12, 2006 3:15 pm

How shape like this is
Code: Select all
..56927..
.9.....2.
7...1...5
9.......2
2.8.6.9.1
6.......4
8...3...9
.3.....5.
..97218..
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The ugly 4

Postby claudiarabia » Thu Sep 14, 2006 8:25 am

JPF wrote:I like the sub-patterns.
Code: Select all
 . . . . 9 8 7 . .
 . . . 3 . . . 6 .
 . . 7 . . . . . 5
 . . 4 . . . . . 1
 . . . 2 3 7 . . .
 6 . . . . . 3 . .
 3 . . . . . 9 . .
 . 5 . . . 1 . . .
 . . 2 5 8 . . . .


Claudia,
What is interesting in this one, is that you can choose 3 numbers in r9c5...
You get very different puzzles .
Code: Select all
r9c5   ER

4      7.4
6      2.6
8      8.3 

JPF


Hi JPF, thank you for eliminating the ugly 4 in r9c9. Now it's perfect. And for the three ways-hints. Sometimes I'm also searching for some trigger points of level-change, some people in my surrounding become disappointed otherwise.

Claudia
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Postby claudiarabia » Fri Sep 15, 2006 3:20 pm

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


Claudia
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Postby daj95376 » Fri Sep 15, 2006 5:22 pm

Claudia, nice job of mixing things up: Singles, 2x Naked Pair, 2x Naked Triple, 3x Locked Candidates, Swordfish, X-Wing, 2x XY-Wing, XYZ-Wing, UR 1, Colors, Multi-Colors, Triple-Implication Chain, 3x Elimination-By-Contradiction.
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A wheel

Postby claudiarabia » Fri Sep 15, 2006 10:33 pm

Eioru wrote:How shape like this is
Code: Select all
..56927..
.9.....2.
7...1...5
9.......2
2.8.6.9.1
6.......4
8...3...9
.3.....5.
..97218..


Hi Eioru,

Whow, there are several wheels here in the forum, but I never saw one, where you can put in all possible candidates in r5c5, i.e. the center, getting a valid ambitious solution every time: 5 and 7 give Level SE 7,3 and 4 and 6 give Level 7,8! Congrats for this!

Claudia
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not really difficult ...

Postby claudiarabia » Sat Sep 16, 2006 3:00 am

...but I could make my previous sudoku fully symmetric:D

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

Suggestions to make this pattern more difficult are welcome. I'm tired and will go to sleep now.

Claudia
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Postby JPF » Sat Sep 16, 2006 7:33 am

Here's one to start :

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

JPF
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Postby claudiarabia » Sat Sep 16, 2006 8:29 am

JPF wrote:Here's one to start :

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

JPF


I was sure that somebody of yours will delete the 5 in the center:)
Great!
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not really symmetric....

Postby claudiarabia » Sat Sep 16, 2006 11:29 pm

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


This puzzle was symmetric :-j When I finished it I found that there were to many 7s inside. So I eliminated some of them and the puzzle stayed valid, it's level risen from SE 7,1 to 8,3.

Claudia
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... and a puzzle of Fermat updated

Postby claudiarabia » Sun Sep 17, 2006 12:02 pm

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


Claudia
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