problem with today's windoku from sudoku.today site

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problem with today's windoku from sudoku.today site

Postby urhegyi » Fri Jul 30, 2021 4:48 pm

Normally windokus published on this site have always a clear and logical solvepath. Today it has a rating of SE9.5 by sudokuexplainer. I can't find any logical way to solve it. Is it because sudokuexplainer is missing some new techniques? Anyone can try this windoku? The only single I can find is R9C8=5. Then i'm totally blocked.
Image
Code: Select all
005200700900000000000060091000006000700050002000700000430010000000000009007002400

update: when assuming R1C9=4 and R7C9=7 it can be solved.
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Re: problem with today's windoku from sudoku.today site

Postby urhegyi » Sun Aug 01, 2021 10:50 pm

I found out when R1C9=4 and R7C9=7 it can be solved.
Does anyone see a possible logical solvepath without trial and error?
Here I am stuck:
Code: Select all
+----------------------+----------------------+----------------------+
| 138    18     5      | 2      3489   1389   | 7      368    3468   |
| 9      124678 123468 | 1358   3478   13478  | 2358   2348   3458   |
| 238    2478   2348   | 358    6      34578  | 2358   9      1      |
+----------------------+----------------------+----------------------+
| 2358   2589   2389   | 1389   2348   6      | 1358   13478  34578  |
| 7      4689   3468   | 13489  5      1389   | 13689  1368   2      |
| 23568  124568 124689 | 7      238    3489   | 35689  348    3568   |
+----------------------+----------------------+----------------------+
| 4      3      2689   | 5689   1      589    | 268    2678   678    |
| 2568   2568   268    | 468    378    3478   | 12368  12368  9      |
| 168    1689   7      | 3689   389    2      | 4      5      368    |
+----------------------+----------------------+----------------------+
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Re: problem with today's windoku from sudoku.today site

Postby m_b_metcalf » Tue Aug 24, 2021 10:23 am

urhegyi wrote: The only single I can find is R9C8=5. Then i'm totally blocked.

Same is true for my program, which then goes to brute force.

Note that r5c1 and r5c9 are, individually, redundant.

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Re: problem with today's windoku from sudoku.today site

Postby creint » Tue Aug 24, 2021 7:12 pm

SukakuExplainer gives SE 9.0
My solver can solve it too with nets.
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