The New Sudoku Players' Forum

[m_b_metcalf]

They are minimal, but you can add clues to see the X pattern.

Nice. And here's a minimal St. Andrew's Cross:

Code: Select all

  .  .  .  .  .  .  .  .  .
  .  4  3  .  .  .  2  6  .
  .  5  .  7  .  2  .  4  .
  .  .  5  .  4  .  9  .  .
  .  .  .  9  .  1  .  .  .
  .  .  8  .  2  .  7  .  .
  .  2  .  3  .  8  .  5  .
  .  7  9  .  .  .  4  1  .
  .  .  .  .  .  .  .  .  . SE 6.7


Regards,

Mike Metcalf

[Mauricio]

Code: Select all

1...5...9
.3...8.5.
..2...3..
.7.1.2...
9...4...8
...3.5.9.
..7...8..
.6.4...7.
4...7...5

Don't call me nazi, this was a budhist sign before

Code: Select all

.........
.4865..3.
....3..7.
....8..9.
.123..56.
.6..2....
.2..4....
.5..9714.
.........

How to name this?

Code: Select all

6....2...
.9...4...
..89174..
..4...628
..1...9..
526...3..
..51498..
...7...1.
...3....4

Resembles a cross, not minimal, we can remove r7c6

Code: Select all

1.......3
.4.....7.
...527...
..9.7.1..
..53.47..
..2.5.6..
...148...
.8.....2.
9.......8

Surronded centers

Code: Select all

7...1...6
.3.8.4.9.
..1...3..
.2.....1.
6...9...5
.7.....4.
..2...5..
.1.5.2.8.
3...8...1

Code: Select all

1...7....
.2.6.3.4.
..3...8..
.5.....2.
7...1...8
.3.......
..2...5..
...4.5.7.
9...3...1

[udosuk]

... this pearl, that starts at SE 6. 7 and goes up to 8.5:

Code: Select all

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

I'm puzzled why Mike post a grid in that manner, but here is the same grid in a more standard format:

Code: Select all

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

[udosuk]

Don't call me nazi, this was a budhist sign before

Code: Select all

.........
.4865..3.
....3..7.
....8..9.
.123..56.
.6..2....
.2..4....
.5..9714.
.........

It would still be a buddhist sign, that is if you bother to fill in r5c56...

The Nazi sign should look like this:

Code: Select all

....#....
...#.....
..#...#..
...#.#.#.
#...#...#
.#.#.#...
..#...#..
.....#...
....#....

Don't call me a Nazi , I'm a buddhist by nature...

How to name this?

Code: Select all

6....2...
.9...4...
..89174..
..4...628
..1...9..
526...3..
..51498..
...7...1.
...3....4

A tortoise with a rhombic shell, a long neck and a big tail?

[JPF]

Easy puzzles ; not easy patterns :

Code: Select all

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



Code: Select all

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



Code: Select all

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



Code: Select all

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



Code: Select all

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



[Edit : added the last one]

JPF

[gurth]

Thanks RW for correcting my mistake, and lead me to the thread...

Had a 2nd look thru it, and the discussion still appears interesting to me...

udosuk, most interesting. How can the addition of a clue remove information? It is indeed an astounding paradox which I don't think has been fully explained yet.

Uniqueness is a fascinating subject. I had a shock the other day: while composing a Sudoku with SE it solved a position using a very pretty bug-lite.
Feeling quite chuffed, I saved the Sudoku. Next time I loaded it, I happened to check for validity and it was invalid! Yet SE is quite happy to go ahead and finally announce that the puzzle is solved!

[claudiarabia]

Don't call me nazi, this was a budhist sign before

Code: Select all

.........
.4865..3.
....3..7.
....8..9.
.123..56.
.6..2....
.2..4....
.5..9714.
.........

Hindu/Buddhist swastika

Hi Mauricio,

I'm always happy when people offer new phantastic sudoku-shapes here. As long as the hooks of the cross are not right-rotating and the spokes of the cross are not diagonal it is no nazi-Hakenkreuz. In one Media-Puzzler-Sudoku-sheet, in which the Sudokus come from Japan, I found diagonal swastikas as well, and it is known that many Japanese and have a different dealing with their history than we Germans have.

Anyway, it is a nice 'n easy puzzle and belongs to the Cartier-Class!
To construct straight lines seems so easy but it isn't even if the puzzle in the end is.

Claudia

[claudiarabia]

Nice ribbon...

I agree that this is a great achievement. Well done!

Thanks, Mike.

Here’s an other 19 clues, with diagonal symmetry.

Code: Select all

 1 . . | . . 2 | . . 3
 . 4 . | . 5 . | . . .
 . . 6 | . . . | 7 . .
-------+-------+-------
 . . . | 6 . . | . . .
 . 5 . | . 8 . | . 9 .
 7 . . | . . 3 | . . .
-------+-------+-------
 . . 3 | . . . | 2 . .
 . . . | . 9 . | . 4 .
 2 . . | . . . | . . 9



SE=7.2

JPF

Aah, I tried so often do do a 19er with a higher difficulty. Ravel should collect these preciosities because they are very rare.

Claudia

[claudiarabia]

Code: Select all

6....2...
.9...4...
..89174..
..4...628
..1...9..
526...3..
..51498..
...7...1.
...3....4

Interesting is the mutable cell r2c2 vom 9-->1. It boosts the SE-Rating to 6.6.

Claudia

[m_b_metcalf]

I'm puzzled why Mike post a grid in that manner, but here is the same grid in a more standard format:

Because he was in a hurry and forgot .

Mike

[Mauricio]

Now a minimal swastika.

Code: Select all

.........
.6234..5.
....6..1.
....3..4.
.2345678.
.9..2....
.7..9....
.5..8763.
.........

A difficult X.

Code: Select all

..6...2..
.1.2.3.4.
5...9...1
.5.....1.
..3...6..
.6.....9.
3...7...8
.9.3.1.6.
..4...1..

[claudiarabia]

Code: Select all

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


SE 9.2
If you add the symmetry-missing clue, SE still shows 9.1

Code: Select all

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


And here the rotational symmetry. SE shows 2x Aligned Triplet Exclusion.

Claudia

[Mauricio]

Just random thoughts I had:

Code: Select all

...1....4
..9.7..2.
.4...57..
4....79..
.5..4..1.
..68....2
..46...9.
.1..3.2..
3....8...

Code: Select all

8.......5
..7.8.9..
.3.5.4.6.
..8...1..
.9..2..7.
..6...3..
.7.8.6.9.
..5.4.2..
1.......6

Code: Select all

9..4....7
..2.8..9.
.4...73..
8.....1..
.9.....6.
..1.....5
..92...4.
.1..3.2..
7....6..9

Code: Select all

...468...
..4...5..
.3.....8.
6...3...8
9..1.2..3
1...5...2
.1.....6.
..7...3..
...219...

Code: Select all

.........
.7..2..1.
..64952..
..8...6..
.63...14.
..9...3..
..13897..
.5..1..8.
.........

Code: Select all

3..8.1..9
.9.....2.
..5...3..
7..3.4..1
....1....
2..6.9..4
..7...6..
.8.....9.
1..7.2..3

Edit: Sudoku removed.

[claudiarabia]

Just random thoughts I had:
Kreuze

Code: Select all

....18...
...72....
..53..1..
2..6.437.
78..3..64
don't like to expose the full puzzle again.


Mauricio

I suppose the left-rotating swastika was a try only, how far you can go. Maybe I didn't make it clear in my last posting regarding the cross that I'm not a fan of - even slightly altered - nazi-symbols. But I made clear what I consider to be a Nazi cross. I would never produce such kind of cross. And I felt strange when I saw such a puzzle in Media-Puzzler as well. Can you please remove the last sudoku from this thread. I really don't like to be exposed to the suspicion of allowing nazi-symbols here, especially because I am German. My family wasn't doing well under the nazis and I think Sudoku shouldn't be used for expression of odd political attitudes. Even if you don't want to express such, other people will do and this sudoku spreads a very bad feeling. So please remove it.

With kind regards

Claudia


Claudia

[ravel]

What i remember in this context is, that in the last elections in my country some ballots were blighted with this sign, but 95% of them were the other way round (the sun symbol).