#586, March 23 - March 29, 2024: The Weekly 'Unsolvable' Sudoku Puzzle
by Richard Kröger, guest compiler
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WARNING: This is the Weekly 'Unsolvable' Sudoku, rated above 'Extreme'.
This is currently unsolvable by my solver, except perhaps with trial and error strategies.
Using the solver will not help you. (much).
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Discussion...
Post an idea here...
... by: mabarbee
Correction. Best solution time:
puzzle type=MANUAL_INPUT
Elapsed time is: 3 milliseconds
... by: mabarbee
Best solution time:
Elapsed time is: 11 milliseconds
... by: Serban
# 586 Basics to 21
1. Column 1 n=3 e=6 Nc=10 Ns=2
1a. if B1=5 basics to 31 XY-wing 179 [H49,J8] => [J6,H7]<>1 => J6=9 solve
1b. B1=5 & H1=4 solve
1c. B1=5 & F1=1 solve
Note: J1=8 F1=1 basics to 23
2. Column 8 n=3 e=6 Nc=8 Ns=3 => J8=7 & G8=8 solve
... by: Dieter
Sorry, missed G9 / H9 = 5 / 9
... by: Dieter
Started with combinations of G9 / H9 = (5,8) / (7,9).
H7 = 3 led me to a solution.
... by: Frans Goosens
#586
Combination 2-digits cells
A9=5 Wrong, Undo calculation
A9=6 No solution, Fixed
C8=4 No solution, Undo calculation
C8=7 No solution, Undo calculation
C9=2 No solution, Undo calculation
C9=7 ( A3=3 ) Solved,
Total solving time is : 28 sec.
Number of logical steps is : 7828
... by: Valery
B1=5 -> gives an unambiguous solution
... by: numpl_npm
SE9.3
17J78 -> solve with basics
By HoDoKu,
8A4 & 5B1 -> solve with singles
5B1 & 8C2 -> solve with singles
8C2 & 7C9 -> solve with singles
5A7 & 7J8 -> solve with singles
...
many other similar combinations -> solve with singles
Archive
Each week a new 'unsolvable' will be published and the previous will be accessible here from this archive section. If you like very tough puzzles, these are for you.Share and Enjoy