Sandwich Sudoku--Odd or Even(CSC2020 Leftover)
(Published on 21. October 2020, 16:06 by cdwg2000)
This puzzle is a variant sandwich sudoku.
Standard Sudoku rules apply.
1)Clues outside the grid show all the digits that have odd/even digits as neighbours on both sides in the corresponding row or column.
2)If the first cell is an even number, the even-sandwich rule applies, and if the first cell is an odd number, the odd-sandwich rule applies.
3)Clues outside the grid are written in an ascending order, which is not necessarily the order in which they appear in the grid.
4)For each row and column with any outside clues, all such numbers are given. There is no information for rows and columns without outside clues. A dash(-) means no digit has such property in that row/column.
For example:
For clarification of the rules, it is recommended to check the related variants here Even Sandwich Sudoku(Richard)
The puzzle is also available online via Penpa. F-puzzle.Have fun solving!
The author of the puzzle is my friend 胡蒙汀(Hu Mengting) from China. I hope you like it.
Your feedback and comments are highly appreciated :) Enjoy !
Solution code: Solution code: Row 9, followed by Column 5
Comments
on 30. August 2021, 16:53 by Mody
Tolle Variante :)
on 10. August 2021, 22:50 by Richard
Very nice twist on the normal Even Sandwich Sudoku!
on 10. April 2021, 00:21 by cdwg2000
@marcmees
@Krokant
I am glad you like it.
on 9. April 2021, 21:52 by marcmees
must have skipped this as too hard when it got published. Solved smooth now. Very nice.
on 18. February 2021, 02:35 by Krokant
Holy cow, I made it. Finding an entry proved to be really difficult. Still surprised my logic held up. Usually there tends to be a gaping hole somewhere ... ;-)
on 24. October 2020, 13:00 by cdwg2000
If anyone is confused about the entrance to this puzzle and needs clues, please leave a message to let me know. Here emphasizes the importance of negative constraints for problem solving! ! !
on 24. October 2020, 11:20 by adam001
@adam001
Sorry to delete your feedback by mistake when editing the comment!
Thank you for successfully completing the answers and feedback! I added hidden clues in the comment area. You should be able to see it before. This is the logic of my problem-solving problem when verifying this difficult problem. I hope to help you.
on 22. October 2020, 15:45 by cdwg2000
@MagnusJosefsson @r45 @NikolaZ
Glad to see you completed the answer. If it is convenient, can you give appropriate feedback, such as: Is there any ambiguity in the rule description, and does it need to be clarified? How difficult is it? In order to make improvements during subsequent production, thank you!
on 21. October 2020, 23:36 by cdwg2000
Add penpa Link.
