#638, March 22 - March 28, 2025:
The Weekly 'Unsolvable' Sudoku Puzzle
by Andrew Stuart
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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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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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Discussion...
Post an idea here...
... by: Serban
# 638 A6=6 C3=7 G3=4 G5=9 Basics to 27
correction
1. Number 4 n=5 e=4 N=9 Nc=3 Ns=2 => any[B2,C4,E9,F6]=4 solve
if C2=5 OR A4=5 OR B6=8 => C4=4 solve
if F9=2 => E9=F6=4 solve
2. Number 1 n=3 e=6 N=19 Nc=12 Ns=6 => A7=E8=1 solve
Note: H4=1
3. Number 6 n=4 e=5 N=17 Nc=13 Ns=6 => D2=J8=6 solve
... by: Dieter
#638 - basics: A6=6; C3=7; G5=9; G3=4
strategy: try to get hidden pairs or triplets. No solver used.
combinations of G2 = (2,3,5,8) and G6 = (3,5,8)
After basic checks > 1 matrix left: G2 / G6 = ( 8 / 5)
Solves with B2=4
Review:
B2=4 & G2=8 solve.
... by: Serban
# 638 A6=6 C3=7 G3=4 G5=9 Basics to 27
1. Number 4 n=5 e=4 N=9 Nc=3 Ns=2 => any[ B2,C4,E6,F9]=4 solve
2. Column 4 n=3 e=6 Nc=6 Ns=4 => E4=8 solve
Note: D4=2 H4=1 J4=7
3. Column 6 n=4 e=5 Nc=9 Ns=4 F6=4 solve
Note: E6=7
