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#633, February 15 - February 21, 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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Supporter Members have access to all these puzzles going back to number 1.

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Tuesday 18-Feb-2025

... 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

Sunday 16-Feb-2025

... 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

Saturday 15-Feb-2025

... 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

Saturday 15-Feb-2025

... by: Hrudaya

B1=5
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