#590, April 20 - April 26, 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: Serban
# 590 J5=3 Basics to 22
1. Box 3 GHJ123 n=2 e=7 Nc=40 Ns=15 => J3=9 & G1=5 solve
2. Box 6 GHJ456 n=5 e=4 Nc=4 Ns=2 => J6=5 basics to 42
2a. W-wing 29 [A2,B6]=>[A6,B3]<>9 => A2=9 basics to 52
2b. W-wing 57 [F1,C9]=>[C1,F9]<>7=> C1=4 solve
3. Box 7 ABC 789 n=3 e=6 Nc=20 Ns=10 => B7=2 & B8=3 basics to 44
3a. X-chain x=6 => [D16,EH2,G5] <>6 => D2=6 solve
... by: Frans Goosens
#590
Combination 2-digits cells
B5=2 Wrong, Undo calculation
B5=4 No solution, Fixed
E4=1 No solution, Undo calculation
E4=7 No solution, Undo calculation
G5=2 No solution, Undo calculation
G5=6 Wrong, Undo calculation
G5=2 No solution, Fixed
A4=2 Wrong, Undo calculation
A4=3 ( D2=6 ) Solved,
Total solving time is : 94 sec.
Number of logical steps is : 16774
... by: Dieter
GHJ 456 complete > 3 valid matrices
B5 only can only be 2 or 4; 2 failed
G4/J6/H6 =7/5/6 and A7=8 solved
... by: Serban
# 590 J5=3 Basics to 22
1. Number 2 n=2 e=7 N=27 Nc=28 Ns=7 => F3=A6=2 solve
2. Number 5 n=2 e=7 N=28 Nc=36 Ns=15 => J6=H9=5 solve
3. Number 7 n=2 e=7 N=32 Nc=66 Ns=36 => F1=C9=7 solve
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