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#668, October 18 - October 24, 2025:
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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Saturday 18-Oct-2025

... by: Serban

# 668 G7=8 Basics to 22

1. Number 9 n=2 e=7 N=27 Nc=34 Ns=7 => H9=9 basics to 43
1a. X chain x=6 =>[J1,F2,D4,H5,C9] <>6 => D1=6 solve
2. H9=9 & B4=1 solve
3. H9=9 & J1=2 solve
4. H9=9 & D4=3 solve
5. H9=9 & B9=4 solve
6. H9=9 & G6=6 solve
7. H9=9 & D7=7 solve
8. H9=9 & E4=8 solve
9. H9=9 & E6=9 solve
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