Double Negative
(Published on 29. June 2024, 11:25 by Belamis)
Sudoku: Normal Sudoku rules apply.
Kropki: Digits in cells separated by a white dot are consecutive. Digits in cells separated by a black dot have a 1:2 ratio.
All possible Kropki dots are given. NOTE: There is never a black and white dot placed in the same spot.
Fog of War: The grid is partially covered in fog. Correctly placing digits will clear the fog around that cell. No guessing is required.
Solution code: Column 9
Comments
on 15. July 2024, 13:51 by michael_787
It's very satisfying to be able to place digits into the midst of the fog and watch all the surrounding fog clear away. Perfectly set, thank you! In my solve, however, the white dot between r7c9 and r8c9 was not needed.
on 30. June 2024, 00:50 by brightonsimon
Enjoyed this immensely. Kropkis are my favourite and it's surprising how powerful the negative constraint is. (Incidentally I had no trouble interpreting the rule which disallows 1/2 pairs and completed the puzzle before reading the comments). Thanks for the fun!
on 29. June 2024, 20:31 by maiaz
Better wording:
"A spot never needs to have both black and white dot"
"No dot needs to be simultaneously black and white"
on 29. June 2024, 14:25 by Ragna
Fun puzzle! Thank you. :-)
on 29. June 2024, 13:30 by Basil
rule-suggestion: A 1 may not appear next to a Kropki dot.
Or if you want to write the same thing in a more complicated way.
No Kropki dot in this puzzle could be replaced by a dot of the opposite color.
on 29. June 2024, 12:51 by samuelsamjo
"a 1 and 2 can never appear together on a dot (Or without a dot due to the negative constraint). " that is clearer
on 29. June 2024, 12:06 by Belamis
Corrected solution code - Column 9 rather than Column 1
on 29. June 2024, 11:54 by samuelsamjo
"a 1 and 2 can never appear together on a dot (Or without a dot due to the negative constraint). " that is clearer
on 29. June 2024, 11:41 by samuelsamjo
"There is never a black and white dot placed in the same spot." Does this mean that 1 and 2 can be separated by either a black dot or a white dot? Or does it mean that 1 and 2 never appear together on a dot?
Reply
It means that a 1 and 2 can never appear together on a dot (Or without a dot due to the negative constraint). Open to better wording for this.
