No Negative Knight
(Published on 22. March 2024, 18:16 by GBPack)
1) Normal Sudoku rules apply
2) Cells separated by a knight's move (in chess) cannot contain the same digit
3) Cells separated by a black dot contain digits in a 1:2 ratio. Not all pairs of cells in a 1:2 ratio have a black dot between them
You can play it here: f-puzzles. Or here: CTC-App
Solution code: Row 1 + Row 2 (18 Digits)
Comments
on 29. July 2024, 09:42 by Gullie
Wow, I enjoyed that a lot! Can’t believe iets only at 77%. The middle part was quite tricky, the comments helped me figure out the ending :-).
Very clever setting, loved how that final piece fell in the puzzle. Thanks for sharing!
on 10. April 2024, 19:43 by Isfan
Love the puzzle and the clever use of Rule#3!
Thank you ♥
@VitP
A "Negative Constraint" means that all marked clues are given, such as Black Dots. It doesn't apply to the Anti-Knight rule since it's not a marked clue.
A "Negative Constraint" rule here would be along the lines of "All black dots are given." Most puzzles with no negative constraint say "Not all black dots are necessarily given."
This puzzle's wording is similar to the latter, but with an important key difference..
on 26. March 2024, 09:23 by VitP
several people have mentioned a "negative constraint" in these comments. what "negative constraint"? "anti-knight" is NOT a "negative constraint"
on 24. March 2024, 15:38 by BHUNTER47
FYI - the solution code that Sudokupad thinks is correct, as far as I can tell, is the incorrect solution that you would get without very careful reading of Bullet 3.
The solution code that works here as the valid solution is showing up as invalid in Sudokupad
on 23. March 2024, 20:21 by Ryx
Nice use of the negative constraint. Unfortunately for me, I am self diagnosed "boolean-challenged", so at the end, I got the wrong solution .. until I re-read the instructions 3 more times ;-)
on 23. March 2024, 06:20 by Juiceshack
This may be my favorite puzzle I've ever solved. I've never seen a negative constraint need to be implemented in order to give the unique solution so hats off to you, Well Done!
on 22. March 2024, 22:42 by SKORP17
ich habs begriffen !
on 22. March 2024, 21:00 by Unterstadt96
That is a mean positive use of negative constraint.
on 22. March 2024, 19:39 by Playmaker6174
What an evil ending haha
I think a lot of people here will miss that extra detail on the rule set x)
