Supernova
(Published on 3. November 2021, 20:32 by Nahileon)
Normal Sudoku rules apply.
Quadruple: A digit in a circle must appear in at least one of the four cells surrounding that circle.
Every even digit must see at least one identical digit via a knight's move (in chess). E.g. if r5c2 is a 2 then there must be at least one 2 in r3c1, r3c3, r4c4, r6c4, r7c3 and r7c1.
Solution code: Row five in the Sudoku.
Comments
on 4. February 2023, 19:55 by Agent
Elegance at its finest!
on 21. April 2022, 22:05 by ocaly
What a beauty! 36 minutes of pure delight. I kept on finding pieces of logic which is just what a good puzzle defines. also very balanced difficulty throughout the solve.
on 25. November 2021, 23:07 by Magnive
Loved this! Had a relatively easy time of it and finished in a bit under 30 minutes and loved every moment! Really delightful interplay between the two rulesets!
on 25. November 2021, 09:50 by Inanbana
No words, just amazing!
on 12. November 2021, 01:21 by kuraban
Devilish. Took me forever to figure out the break in, and from there, just seemed to flow. Shout out to Qodec for the recommendation!
on 9. November 2021, 02:49 by thoughtbyte
Stunning puzzle, thanks!
on 8. November 2021, 18:46 by Phistomefel
@Storm: You are absolutely right. Thank you for the remark! :)
on 8. November 2021, 17:33 by Storm
@Realshaggy and Phistomefel. I think Nylimb's comment in that link gives an example with connected regions.
on 8. November 2021, 16:39 by Realshaggy
@Phistomefel. I tried something like that, taking some of the solutions without regions and try to draw irregular regions, but without success. Same digits tend to be clumped together, so you probably have to start from a solution where all digits are somehow well distributed across the grid. I did not follow this further. Maybe it's worth revisiting.
on 8. November 2021, 15:37 by Phistomefel
@Realshaggy: I believe you that it is impossible for classic Sudoku regions, but there exist irregular regions for which such an arrangement of digits is possible, for instance in the following puzzle:
https://logic-masters.de/Raetselportal/Raetsel/zeigen.php?id=0003W8
I wonder whether there exists a set of connected irregular regions for which an Anti-Antiknight arrangement is possible.
on 8. November 2021, 14:54 by Qodec
Oh how heartily I wished I could give a standing ovation. What a masterpiece!
on 8. November 2021, 05:19 by polar
I can only echo the other comments here. Sublime! Thank you for setting this :)
on 8. November 2021, 02:23 by Playmaker6174
Hands up, one of the best sudokus involving quadruple clues that I've ever solved. Delicate design with stunning interactions between the even digits and the quads, a work of a real genius.
on 7. November 2021, 21:52 by Realshaggy
In case anyone is interested: Anti-Antiknight, where every digit sees an identical digit (beside the corner cells for obvious reasons) is actually impossible. I tried to set something like that some years ago and wrote a program to check after I couldn't get it done.
on 7. November 2021, 20:29 by Phistomefel
This puzzle feels magical. Thank you so much for setting this beauty, Nahileon!
on 5. November 2021, 21:51 by Nahileon
Thank you!
on 5. November 2021, 05:11 by Willy Wonka
There is something very special going on in this puzzle! Lovely solve
on 5. November 2021, 03:23 by wenchang
very interesting puzzle.
on 4. November 2021, 23:49 by avishai
just wow! i almost gave up several times, and just kept plugging away - so much fun to uncrack it, and even after the breakthrough, it was still a joy! Thank you so much!
on 4. November 2021, 04:56 by Elliott810
I'm lost for words! This construction is stunning. I would love to see this on CTC. I suppose Simon will be moved to tears. Thx for sharing:)
