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#653, July 5 - July 11, 2025:
The Weekly 'Unsolvable' Sudoku Puzzle

by Andrew Stuart
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 5-Jul-2025

... by: Dieter

#653 - populated cells = 24 = 29,6%
basics: D2=1; E6=6; D7=7; F2=8
populated cells = 28 = 34,6%
combinations of A3 = (3,5,6,7) and G3 = (1,2,7) as numbers 6,1,2,7 are populated most.
No solver used: A3=5 & G3=1 solves.

Saturday 5-Jul-2025

... by: Serban

# 653 D2=1 D7=7 E6=6 F2=8 Basics to 28

1. Number 4 n=2 e=7 N=30 Nc=58 Ns=4 => J8=C1=4 OR J8=G2=4 basics to 41
1a.W-wing 79 [J4,A5] => H5<>9 => H5=2 solve

2. Number 5 n=2 e=7 N=19 Nc=10 Ns=7 => A3=C4=5 OR A3=B7=5 solve
Note : J5=5
Page created on 03-May-2011, last modified on 30-May-2024.
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