The New Sudoku Players' Forum

by **JPF** » Sat May 05, 2007 12:31 pm

Here's a €8.3 clue :

Code: Select all: . . 1 2 3 . 4 . . . . . . . . . 5 . . 6 . . . . . 7 . 7 . 8 6 . . . . . . 5 . . . . . . . 9 . 2 4 . . . . . . 7 . . . . . 3 . . . . . . . . 6 . . . 9 3 1 . 2 . . SE=8.3

JPF

by **JPF** » Thu May 17, 2007 9:29 pm

The new challenge :

Code: Select all: . . 1 | . . 2 | . . 3 . 2 . | . 1 . | . 4 . . . . | 5 . . | 6 . . -------+-------+------- . . . | . . . | . . 1 5 . . | . . . | . 7 . . 6 . | . . . | 8 . . -------+-------+------- . . 7 | . . . | . . 4 . 1 . | 8 . . | . 2 . 8 . . | . 6 . | . . . SE=1.5

JPF

by **Mauricio** » Thu May 17, 2007 10:46 pm

JPF wrote:The new challenge :

First challenger

Code: Select all: . . 1|. . 2|. . 3 . 4 .|. 5 .|. 6 . . . .|7 . .|5 . . -----+-----+----- . . .|. . .|. . 2 5 . .|. . .|. 4 . . 8 .|. . .|1 . . -----+-----+----- . . 7|. . .|. . 9 . 6 .|5 . .|. 7 . 2 . .|. 6 .|. . . ER 6.6

According to my rating system, this one should be easier than 6.6, I think my rater has a bug ...

I found the bug, sort of. I disabled the lines that rated the sudokus (and forgot to enable them again), my program was not rating them at all.

by **JPF** » Thu May 17, 2007 11:09 pm

riposte :

Code: Select all: . . 1 | . . 2 | . . 3 . 3 . | . 4 . | . 5 . . . . | 6 . . | 4 . . -------+-------+------- . . . | . . . | . . 2 4 . . | . . . | . 7 . . 8 . | . . . | 1 . . -------+-------+------- . . 6 | . . . | . . 5 . 7 . | 4 . . | . 8 . 2 . . | . 9 . | . . . SE=8.3

JPF

by **Mauricio** » Fri May 18, 2007 4:12 am

Code: Select all: . . 1|. . 2|. . 3 . 3 .|. 4 .|. 5 . . . .|6 . .|7 . . -----+-----+----- . . .|. . .|. . 1 6 . .|. . .|. 4 . . 8 .|. . .|2 . . -----+-----+----- . . 7|. . .|. . 2 . 5 .|9 . .|. 8 . 2 . .|. 5 .|. . . ER 8.4

by **JPF** » Fri May 18, 2007 8:16 am

Nice moves Mauricio !

Next :

Code: Select all: . . 1 | . . 2 | . . 3 . 4 . | . 1 . | . 5 . . . . | 6 . . | 7 . . -------+-------+------- . . . | . . . | . . 6 5 . . | . . . | . 1 . . 8 . | . . . | 9 . . -------+-------+------- . . 7 | . . . | . . 2 . 5 . | 4 . . | . 8 . 3 . . | . 8 . | . . . SE=8.9

JPF

by **Mauricio** » Fri May 18, 2007 10:05 pm

This one took a while to find

Code: Select all: . . 1|. . 2|. . 3 . 4 .|. 5 .|. 6 . . . .|1 . .|7 . . -----+-----+----- . . .|. . .|. . 1 3 . .|. . .|. 5 . . 7 .|. . .|8 . . -----+-----+----- . . 8|. . .|. . 2 . 6 .|7 . .|. 4 . 2 . .|. 3 .|. . . ER 9.0

I guess it is not against the rules to post two sudokus that have the same rating

Code: Select all: . . 1|. . 2|. . 3 . 4 .|. 5 .|. 6 . . . .|4 . .|7 . . -----+-----+----- . . .|. . .|. . 8 5 . .|. . .|. 4 . . 9 .|. . .|1 . . -----+-----+----- . . 3|. . .|. . 2 . 7 .|9 . .|. 5 . 6 . .|. 8 .|. . . ER 9.0

by **Mauricio** » Sat May 19, 2007 2:54 am

This is a little off topic. Take the next sudoku:

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

If you modify 1, 2 or 3 filled cells of it and get a valid sudoku, then the new sudoku obtained is isomorphic to the starting one.

Has anyone generated a sudoku with this property?

Edit: The next has the same property, and moreover, I think it is a untouchable level 2:

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

by **JPF** » Sun May 20, 2007 12:02 am

Mauricio wrote:This is a little off topic. Take the next sudoku:
Code: Select all
. . 1|. . 2|. . 3 . 4 .|. 5 .|. 6 . . . .|7 . .|8 . . -----+-----+----- . . .|. . .|. . 1 8 . .|. . .|. 5 . . 7 .|. . .|2 . . -----+-----+----- . . 3|. . .|. . 5 . 6 .|8 . .|. 7 . 2 . .|. 1 .|. . .

If you modify 1, 2 or 3 filled cells of it and get a valid sudoku, then the new sudoku obtained is isomorphic to the starting one.

Has anyone generated a sudoku with this property?

One digit [9] is missing in the puzzle.
Therefore, if a digit say x has n occurences in the puzzle, there are at least n isomorphic puzzles ([x]->[9]) to the initial one when n clues are changed.

for n=1 :[4]
for n=2 :[3] [6]
for n=3 :[1] [2] [5] [7] [8]

and in this particular case, there are no other mutable clues for n<=3.

JPF

by **JPF** » Wed May 23, 2007 5:41 pm

Mauricio wrote:If you modify 1, 2 or 3 filled cells of it and get a valid sudoku, then the new sudoku obtained is isomorphic to the starting one.

Has anyone generated a sudoku with this property?

Here 's one :

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

isolated puzzle among puzzles with this pattern (D>=4).

PS : I'm still trying to beat your ER=9.0, but unsuccessfully

JPF

by **Mauricio** » Sun May 27, 2007 1:00 am

A week has passed since I posted my sudoku, I suppose I won.

New challenge!

Code: Select all: 1 . .|. 2 .|. . 3 . . .|4 . .|. 5 . . . 6|. . .|1 . . -----+-----+----- . 4 .|. . 7|. . . 7 . .|. . .|. . 6 . . .|6 . .|. 2 . -----+-----+----- . . 2|. . .|4 . . . 5 .|. . 1|. . . 8 . .|. 3 .|. . . ER 1.5

by **JPF** » Sun May 27, 2007 10:15 am

Mauricio wrote:A week has passed since I posted my sudoku, I suppose I won.

Yes, congratulations !

Mauricio wrote:New challenge!

hmm, 19 clues ; not an easy one.

Here's a first proposal, not an all singles :

Code: Select all: 1 . . | . 2 . | . . 3 . . . | 4 . . | . 5 . . . 6 | . . . | 1 . . -------+-------+------- . 1 . | . . 7 | . . . 3 . . | . . . | . . 6 . . . | 6 . . | . 2 . -------+-------+------- . . 2 | . . . | 7 . . . 5 . | . . 1 | . . . 8 . . | . 3 . | . . . ER 2.0

JPF

by **Mauricio** » Sun May 27, 2007 1:58 pm

As I posed the puzzle, I have an advantage, this puzzle is easy to defeat.

Code: Select all: 1 . .|. 2 .|. . 3 . . .|4 . .|. 5 . . . 6|. . .|1 . . -----+-----+----- . 7 .|. . 1|. . . 2 . .|. . .|. . 7 . . .|6 . .|. 4 . -----+-----+----- . . 4|. . .|6 . . . 5 .|. . 8|. . . 9 . .|. 7 .|. . . ER 2.6

by **JPF** » Mon May 28, 2007 7:00 am

Code: Select all: 1 . . | . 2 . | . . 3 . . . | 4 . . | . 5 . . . 6 | . . . | 7 . . -------+-------+------- . 8 . | . . 6 | . . . 2 . . | . . . | . . 1 . . . | 7 . . | . 3 . -------+-------+------- . . 7 | . . . | 4 . . . 3 . | . . 2 | . . . 4 . . | . 1 . | . . . ER 6.7

JPF

by **Mauricio** » Tue May 29, 2007 6:21 am

So it is just a game between JPF and me?

Code: Select all: 1 . .|. 2 .|. . 3 . . .|4 . .|. 5 . . . 6|. . .|7 . . -----+-----+----- . 4 .|. . 7|. . . 5 . .|. . .|. . 6 . . .|6 . .|. 2 . -----+-----+----- . . 2|. . .|4 . . . 8 .|. . 5|. . . 9 . .|. 8 .|. . . ER 7.1

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