#633, February 15 - February 21, 2025: 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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Each week a new 'unsolvable' will be published and the previous will be accessible here from this archive section.
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Discussion...
Post an idea here...
... by: Frans Goosens
#633
Combination 2-digits cells
C2=1 Wrong, Undo calculation
C2=9 ( A8=8 ) Solved,
Total solving time is : 26 sec.
Number of logical steps is : 3504
... by: Dieter
#633 - basics: C7=3
strategy: try to get hidden pairs or triplets. No solver used.
combinations of A2=(1,5,8) and A3=(1,7,8)
After basic checks > 3 matrices left: (1/7), (5/7) and (8/7)
A2/A3 = (1/7), 60% occupied: solves with G8=6
Review: A2=1 solves with G8=6
... by: Serban
# 633 C7=3 Basics to 24
1. Number 1 n=2 e=7 N=28 Nc=33 Ns=4 => C4=H5=1 solve
2. Number 5 n=2 e=7 N=26 Nc=32 Ns=11 => A6=G5=5 solve
3. Number 6 n=3 e=6 N=19 Nc=15 Ns=11 => D6 & [ A9 OR G8]=6 solve
4. Number 9 n=2 e=7 N=28 Nc=41 Ns=37 => E6=H7=9 solve