Anti Knight Kuromasu
(Published on 2. September 2023, 19:58 by SirWoezel)
RULES:
Normal Sudoku rules apply. There is an anti-knight constraint. The yellow cells form an extra region, which must contain the numbers 1 to 9 each once.
Some cells in the grid need to be shaded.
- The number in a circle shows how many unshaded cells can be 'seen' from that cell horizontally or vertically, including the cell itself. Shaded cells block the view.
- Shaded cells may not be horizontally or vertically adjacent.
- All the unshaded cells must be connected horizontally or vertically.
- Numbers outside the grid show how many cells in that row/column must be shaded.
- Cells with a circle are never shaded.
As always, have fun!
Solution code: Row 1 and Row 9
Comments
on 13. September 2023, 15:39 by pms_headache
Wow. I have had this puzzle open for over a week. Kept coming back to it because I could see the logic. Finally got the shading last night and the finish still took a while! Great puzzle!!
Thanks for not giving up. I didn’t think this was going to get large numbers of solves because of the difficulty, but 4 is pretty disappointing. I should probably have added another clue somehow.
on 7. September 2023, 09:23 by tonald
This puzzle should be treated very very carefully. After trying to solve it for 2 hours, I found something wrong with my steps, but it was almost impossible to check it out. So I restarted and spent another 3 hours on the solution.
on 5. September 2023, 09:49 by Playmaker6174
I suppose there’s no negative constraint on the circles right? (i.e not all circles are given)
on 3. September 2023, 17:32 by SirWoezel
Fixed SudokuPad-rules
on 3. September 2023, 17:27 by SirWoezel
Edited the SudokuPad-rules
on 3. September 2023, 16:53 by henrypijames
Can a circled cell be shaded? And if so, does it block its own view?
No, circled cells are never shaded. I notice I did specify that here on LMG but I forgot it in the rules in SudokuPad. I’ll add that when I get home later.
