Steering Wheel (Classic)
(Published on 14. August 2021, 02:00 by SudokuExplorer)
Classic sudoku rules apply.
Each row, column and 3x3 box contains the digits 1 to 9.
You can try the below main puzzle on Penpa+, SudokuLab or F-Puzzles. Enjoy!
By comparing the top & bottom rows, and leftmost & rightmost columns with the four corner boxes, we get a shifted Phistomefel ring. The yellow and blue sets contain the same digits: https://f-puzzles.com/?id=yztyvhmc
There is a further spoiler below:The two equivalent sets of 16 cells must have two 1s, 2s, 3s, 4s, 6s, 7s, 8s and 9s.
Hint 2: (Highlight the white text below)After placing two digits, the cells R9C1, R5C1 and R9C5 each have two possible candidates. Show that regardless of which value R9C1 takes, R1C5 and R5C9 cannot contain a 9.
Hint 3: (Highlight the white text below)By looking at the pairs involving the digits {1,2,3,4}, determine the possible positions of 3s in box 2. Colouring may help keep track of the 3s. Alternatively, consider the pairs involving the digits {1,2,3,4} and colour two cells with the same colour if they are clones of each other (you may need 8 colours or 4 colours with two different shadings). What does the colouring in column 5 tell you?
Solution code: Enter the 4th column and 8th row
Comments
on 7. June 2024, 22:32 by mikepautov
This is one of the coolest classic sudoku I've ever attempted to solve!
on 17. August 2021, 17:08 by SudokuExplorer
@DiMono: Thanks for your lovely feedback! I had a feeling this was a decent classic, but didn't expect such a positive response from the portal. I hope you find time to make one, as I'd look forward to trying it. :-)
on 16. August 2021, 00:43 by DiMono
The irony of this puzzle for me is I was planning to make one with exactly this break-in, but I didn't get around to it. I think this puzzle is better than what I would have come up with though. Fantastic construction, thank you for making it.
on 15. August 2021, 17:34 by SudokuExplorer
@Playmaker: You're welcome! I also learnt quite a bit from the other solvers too! :-)
@marcmees: Haha! You're an expert solver, so you're probably more comfortable with the logic than most. I'm really glad you enjoyed the puzzle and logic :-)
on 14. August 2021, 15:53 by marcmees
I learned nothing but did just enjoy the puzzle. I hope that's ok? :-)
on 14. August 2021, 13:54 by Playmaker6174
I really learned a lot from this classic one, not easy at all and it required attention to details. Thank you for the puzzle :)
