The New Sudoku Players' Forum

[Mike Barker]

The one I remember has a similar result, but was a different puzzle. Even so, I really liked these fish so thought it worth posting just for the fish. Also, as you pointed out, it also provides a possible explaination for the high Nishio count.

[JPF]

Is a high Nishio chain count meaningful?

Don't know.
Probably interesting for some solvers people.

Even so, I really liked these fish so thought it worth posting just for the fish.

In any case, that's the purpose of this thread and a nice challenge for puzzles designers.

Note: These same fish, likely for the same puzzle, have been posted somewhere in this forum before.

I'd love to see this puzzle

JPF

[ronk]

Note: These same fish, likely for the same puzzle, have been posted somewhere in this forum before.

I'd love to see this puzzle

Judging by the filename on my computer, the puzzle I've worked with before is ...

Code: Select all

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

... and it was posted by Mauricio on 9/3/2007, but I can't find it today. **

Although the empty cells and eliminations are a bit different, it does have the same unfinned jellyfish r3467\c159b5 and c3467\r159b5.

** Mauricio posted five puzzles with this pattern on the Programmers' Forums here.

[Eioru]

The puzzle just only have one digit of 1,2,3.

Code: Select all

4.5.67.89
67..894.5
89.4.567.
568.94..7
7.45..896
9..67854.
15794..68
3498.675.
28675.9.4            ED=7.7/7.7/2.6

24 x Hidden Single
4 x Pointing
1 x Claiming
1 x X-Wing
8 x XY-Wing
2 x Turbot Fish
1 x Nishio Forcing Chains



[daj95376]

The puzzle just only have one digit of 1,2,3.

Code: Select all

finned Franken Swordfish c678\r49b3   [r4c4]<>1
finned Franken Swordfish c678\r47b3   [r4c4]<>2
Singles


[Pat]

[ 57 clues ]

ED=7.7/7.7/2.6

Code: Select all

4.5.67.8967..894.589.4.567.568.94..77.45..8969..67854.15794..683498.675.28675.9.4



Code: Select all

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



hey Eioru,

i assume you meant this for the other Topic?

Maximum number of clues for a given SE rating

[999_Springs]

I was messing around in the patterns game and I got this...

Code: Select all

. . . . 4 . . . .
. . 1 3 . 5 6 . .
. 7 . . . . . 2 .
4 . . . . . . . 3
. 8 . . . . . 9 .
. . 5 6 . 7 4 . .
. 2 . . 1 . . 7 .
3 . . . 6 . . . 8
. . . . . . . . .  ED=7.4/7.2/7.1

Analysis results
Difficulty rating: 7.4
This Sudoku can be solved using the following logical methods:
56 x Hidden Single
3 x Naked Single
7 x Pointing
1 x Claiming
1 x Naked Pair
2 x X-Wing
2 x Hidden Pair
3 x Bidirectional Y-Cycle
3 x Turbot Fish
7 x Bidirectional Cycle
44 x Forcing Chain

This beats the previous record by 13. I know that SE finds the "simplest" move at each step, but I am very suspicious that it deliberately takes a roundabout way to solve these puzzles. Like going from A to B using sat-nav.