Irregular X-sudoku

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Irregular X-sudoku

Postby urhegyi » Wed Nov 18, 2020 12:10 pm

125439002_2278010265678784_3475768094186885609_o.jpg
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Re: Irregular X-sudoku

Postby urhegyi » Wed Nov 18, 2020 12:11 pm

2020-11-19 (4).png
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Last edited by urhegyi on Thu Nov 19, 2020 10:12 pm, edited 1 time in total.
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Re: Irregular X-sudoku

Postby Hajime » Wed Nov 18, 2020 3:46 pm

You solved your own puzzle... How?
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Re: Irregular X-sudoku

Postby 1to9only » Wed Nov 18, 2020 3:52 pm

SudokuSolver - u have to define jigsaw regions, and select X - this JigsawX is solved, singles only.
JSudoku - u have to define jigsaw regions, and select X - this JigsawX is solved, singles only.
SudokuJigsawExplainer will also can be used to solve this, but u have to do the X candidate eliminations!
Code: Select all
........................6.....8..2..1.5....748....2........3..9.4.....1....2.6... 111122222111112222333345555366445555366445777368447777368447799368889999668888999 JSX

SumoCueV1D=0J0=0J0=0J0=0J0=0J1=0J1=0J1=0J1=0J1=0J0=0J0=0J0=0J0=0J0=0J1=0J1=0J1=0J1=0J2=0J2=0J2=0J2=0J3=0J4=6J4=0J4=0J4=0J2=0J5=0J5=8J3=0J3=0J4=2J4=0J4=0J4=1J2=0J5=5J5=0J3=0J3=0J4=0J6=7J6=4J6=8J2=0J5=0J7=0J3=0J3=2J6=0J6=0J6=0J6=0J2=0J5=0J7=0J3=0J3=3J6=0J6=0J8=9J8=0J2=4J5=0J7=0J7=0J7=0J8=0J8=1J8=0J8=0J5=0J5=0J7=2J7=0J7=6J7=0J8=0J8=0J8

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

Edit: fixed SumoCue definition.
Last edited by 1to9only on Thu Nov 19, 2020 5:27 pm, edited 2 times in total.
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Re: Irregular X-sudoku

Postby urhegyi » Wed Nov 18, 2020 5:34 pm

Hajime wrote:You solved your own puzzle... How?

It was posted with 5 stars (the maximum) and very challenging. But I tried myself and like in most newspapers or apps this does not mean they are very hard.
I solved with pencil on paper and found only singles, but it was a good start to discover more.
1to9only wrote:You have to do the X candidate eliminations yourself

I didn't know you can use jigsawexplainer when the solution is not unique because of the diagonal blocks are not(yet) implemented.
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Re: Irregular X-sudoku

Postby 1to9only » Thu Nov 19, 2020 10:33 am

urhegyi wrote:I didn't know you can use jigsawexplainer when the solution is not unique because of the diagonal blocks are not(yet) implemented.

I've corrected my previous post - when I get the multiple solutions message, i scan the diagonals and manually eliminate candidates - had to do this a few times!
Implementing X in the JigsawExplainer would be nice, but this is low priority on my list of things to do...
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Re: Irregular X-sudoku

Postby urhegyi » Thu Nov 19, 2020 11:55 am

2020-11-19 (1).png
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Re: Irregular X-sudoku

Postby Hajime » Thu Nov 19, 2020 4:51 pm

And here is a puzzle with the same layout that also needs some generalized intersections
XJS.PNG
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The puzzle is also with diagonals (XSudoku), not shown in above image.
Code: Select all
#1//B4,XJS
2..19.............................2.45....3.2....6...........9...6......73.5..2..
111122222111112222333345555366445555366445777368447777368447799368889999668888999
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Re: Irregular X-sudoku

Postby urhegyi » Thu Nov 19, 2020 5:40 pm

2020-11-19 (2).png
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I will give it a try, Thanks
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Re: Irregular X-sudoku

Postby urhegyi » Thu Nov 19, 2020 8:43 pm

There is a certain logic in both puzzles. They share the same pattern: the first four digits in row 1 are the last 4 digits of row 2 and the last five digits of row 1 are the same as the first five digits of row 2. And there are more similarities comparing the two puzzles. Can you explain how you created the second from the first? One thing I can say: when I not discovered the way of shuffling solving would be a lot more difficult because of the many locked candidates(pointing and claiming). I also have to find out how the generalized intersections actually work. I'm used to work with the classical intersections.
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Re: Irregular X-sudoku

Postby 1to9only » Thu Nov 19, 2020 9:57 pm

SudokuJigsawExplainer finds far too many generalized intersections. It's a BUG! I'll fix this next week.
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Re: Irregular X-sudoku

Postby urhegyi » Thu Nov 19, 2020 10:13 pm

2020-11-19 (3).png
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Re: Irregular X-sudoku

Postby Hajime » Fri Nov 20, 2020 9:34 am

urhegyi wrote:There is a certain logic in both puzzles. ... Can you explain how you created the second from the first?

It is exactly the same puzzle, but only the digits have been swapped. there are 9! possibilities for this puzzle :D
Eg. all 4's became 2's.

urhegyi wrote:I also have to find out how the generalized intersections actually work. I'm used to work with the classical intersections.

in http://forum.enjoysudoku.com/generalized-methods-t38209.html I try to explain generalized intersections (and generalized kites).
You always need some extra constraints, like the diagonals, to lock a single digit into 3 or more houses.

Here is a new one XJS with the same layout, so also with diagonals. You need some chains...
And the puzzle is a different one than the above.
XJS_hard.PNG
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Code: Select all
#1//B4,XJS
...4.2....2.....7.91..8..45...........................29..4..61.4.....9....6.9...
111122222111112222333345555366445555366445777368447777368447799368889999668888999
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Re: Irregular X-sudoku

Postby urhegyi » Fri Nov 20, 2020 1:40 pm

2020-11-20.png
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Re: Irregular X-sudoku

Postby urhegyi » Fri Nov 20, 2020 2:16 pm

2020-11-20 (7).png
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