Three Ring Circus
(Published on 23. March 2023, 12:43 by Die Hard)
Normal Sudoku rules apply. Every digit on the green and yellow rings (rings 2 and 3) must see its box number by a knight's move (in chess). The digit in the center of the puzzle must see itself 4 times by a knight's move.
As an example, since R8C8 is on the green ring and is in box 9, there must be a 9 in either R6C7, R6C9, R7C6 or R9C6. These are the only 4 cells R8C8 can see in a knight's move.
Solution code: All 9 digits in row 9.
Comments
on 24. March 2023, 04:53 by Die Hard
Improved description.
on 23. March 2023, 21:04 by Die Hard
Added example.
on 23. March 2023, 20:54 by Die Hard
Yes, you are correct. Since since digits are in box 4 (and on the green or yellow rings), they must see a 4 via a knight's move. I will add an example to the description.
on 23. March 2023, 20:48 by Die Hard
As an example, since R2C2 is on the green ring and it is in box 1, there must be a 1 in either: R1C4, R3C4, R4C1 or R4C3. These are the only 4 cells this digit can see via a knight's move.
on 23. March 2023, 20:28 by Die Hard
Improved rules for the colour challenged.
