The New Sudoku Players' Forum

[Hajime]

I was on a trip to the past and in Enxio's post here I found Ruud's Ronin from 2007, also here.

A Samurai-X , perhaps not able to solve with methods (is that so?),
but I found out that this 70-clue puzzle has indeed 1 unique solution.

The challenge was to find a similar puzzle with less clues.
And all puzzles need to be symmetric in various ways.

Here it is: 68 clues.

Probably also not solvable without guessing.

Wrong code ! Correct code further below.

Code: Select all

#5/X/B4/N4/H16/B28/N28
.....8...2.74.....5.6........5.4..9..2............7...6....3...8........9...6....
...3..........75.4......1.8.2..3.7.........6....7........1....7........6....6...5
......................8.....61...72...........2.....5.....6......................
9........1.............8........2....8.9.......7.5..8...3......2.97..........9.2.
........7........1...2........9..........8.6..8..6.4........5.......16.8.2.6.....

[m_b_metcalf]

Probably also not solvable without guessing.

Right. Nice puzzle.

Mike

Hidden Text: Show

Code: Select all

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

[urhegyi]

Mike,
You posted the solution of the original Ronin with 70 clues by Ruud under the hidden text.
I think the new 68 clues created by Hajime is computional less hard as the original but still a very challenging task and not solvable without guessing.
What do you think about it?

[m_b_metcalf]

You posted the solution of the original Ronin with 70 clues by Ruud under the hidden text.
I think the new 68 clues created by Hajime is computional less hard as the original but still a very challenging task and not solvable without guessing.
What do you think about it?

Yes to all the above. It appears that both puzzles have the same solution!

Mike

[urhegyi]

You posted the solution of the original Ronin with 70 clues by Ruud under the hidden text.
I think the new 68 clues created by Hajime is computional less hard as the original but still a very challenging task and not solvable without guessing.
What do you think about it?

Yes to all the above. It appears that both puzzles have the same solution!

Mike

Yes, I was confused with the one posted on the picture:

Code: Select all

#5/X/B4/N4/H16/B28/N28
......5......86..2.2.......4........1..9..........2.4...5.3......1......2..5.....
..6......3..92...........6.........9.....3..8.8.4.........7.6........8.......8..1
......................9.....4.....7....6.1....9.....3.....5......................
6..5.......8........3.8.........5.3.7..3.....2.........8...........62..3......1..
.....9..5......4......2.7...3.1..........4..8........6.......9.1..59......5......

[m_b_metcalf]

Code: Select all

#5/X/B4/N4/H16/B28/N28
......5......86..2.2.......4........1..9..........2.4...5.3......1......2..5.....
..6......3..92...........6.........9.....3..8.8.4.........7.6........8.......8..1
......................9.....4.....7....6.1....9.....3.....5......................
6..5.......8........3.8.........5.3.7..3.....2.........8...........62..3......1..
.....9..5......4......2.7...3.1..........4..8........6.......9.1..59......5......

Much easier:

Hidden Text: Show

Code: Select all

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

[Hajime]

It appears that both puzzles have the same solution!

Oeps, in the first post the code doesn't correspond with the picture
It also has more than 68 clues. Wrong code.
Fortunately urhegyi made the correct one...

[creint]

Both are solvable with SE < 10, first one is harder.