The New Sudoku Players' Forum

[gurth]

Claudia,

That Cartier is hard, I still haven't got a thing but I am only starting on it still.

Your latest jewellery is easier. Here are two versions, strictly to design:

Code: Select all

 #claje1 minimal SE=8.3 (GC02).

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


Code: Select all

#claje2 untouchable easy jade oyster (GC03).

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


Gurth

____________________________________________________

[claudiarabia]

SE 8.4

Code: Select all

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



JPF

Nice ribbon posted with perfect timing! With 19 clues only with such a high difficulty-level it is straddling the spheres of the still unreached gfroyle-beauty!

Claudia

[JPF]

Nice ribbon posted with perfect timing! With 19 clues only with such a high difficulty-level it is straddling the spheres of the still unreached gfroyle-beauty!

Thanks, Claudia.
Yes, the timing was right...
The rating (8.4) you mentionned was related to my previous puzzle.
This one is a pure singles.

JPF

[m_b_metcalf]

Nice ribbon posted with perfect timing! With 19 clues only with such a high difficulty-level it is straddling the spheres of the still unreached gfroyle-beauty!

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

Mike Metcalf

[JPF]

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

[m_b_metcalf]

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

JPF

Nice. This one has one symmetry-breaking cell. Let's just say it's warding off the evil eye. (Note: this is not an X-sudoku.)

Code: Select all

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


SE 8.4.

Regards,

Mike Metcalf

[claudiarabia]

Code: Select all

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

SE 7.1

Code: Select all

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


An adaptation of a Gurth-Puzzle with one clue less and SE 8.4.

claudia

[m_b_metcalf]

Code: Select all

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

SE 7.1
claudia

Two more cells can go, but it stays at SE 6.7:

Code: Select all

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


Regards,

Mike Metcalf

[udosuk]

So we have a puzzle with some clues missing but a lower SE-rating?

Would be interested to see the solving logs of those 2 puzzles...

[daj95376]

There's more than just two clues missing. Some of the clues have been changed. This changes the nature of the puzzle completely.

[udosuk]

Thanks daj for the explanation, didn't look at the grids carefully...

But I once saw a puzzle becoming harder to solve when a clue is added (edited), because it takes away a potential UR... Sadly I couldn't retrieve the original thread...

[RW]

But I once saw a puzzle becoming harder to solve when one of the initial clues is removed, because it takes away a potential UR...

I guess that was intended the other way around, making a puzzle harder by adding a number.

RW

[udosuk]

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...

[Mauricio]

Two simple patterns:

Code: Select all

......1..
.1.2.3.4.
9...6...5
.8.....2.
..1...3..
.6.....9.
7...4...9
.3.8.9.1.
..9...5..

Code: Select all

..2...8..
.1.2.3.4.
8...9...7
.8.....2.
..4...5..
.7.....6.
1...2...5
.4.1.7.9.
..9...6..

Code: Select all

.6.....2.
1.....3.4
.5.4.9.6.
..5.4.2..
...5.3...
..1.2.8..
.1.3.4.7.
7.3...4.6
.2.....5.

Code: Select all

.6.....2.
1.....3.4
.3...5.8.
..8.6.7..
...7.2...
..3.8.2..
.5.8.9.4.
4.1.....5
.......7.

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

[m_b_metcalf]

There's more than just two clues missing. Some of the clues have been changed. This changes the nature of the puzzle completely.

Exactly. And that's why I wrote 'cells' and not 'clues'. To illustrate your point further, 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         


plummets to about 1.5 when one cell is removed and three others have their values altered:

Code: Select all

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


Regards,

Mike Metcalf