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#590, April 20 - April 26, 2024:
The Weekly 'Unsolvable' Sudoku Puzzle

by Richard Kröger, guest compiler

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).

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.
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Monday 22-Apr-2024

... 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

Saturday 20-Apr-2024

... 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

Saturday 20-Apr-2024

... 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
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