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#628, January 11 - January 17, 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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Supporter Members have access to all these puzzles going back to number 1.

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Monday 13-Jan-2025

... by: Serban


# 628 A5=F6=1 A6=2 D5=3 G1=E5=H6=7 J6=8 Basics to 34

1. Number 2 n=4 e=5 N=14 Nc=8 Ns=6 => H1=2 solve
Note: E3=2
2. Number 5 n=2 e=7 N=23 Nc=14 Ns=5 => J2=5 solve

3. Number 8 n=4 e=5 N=13 Nc=6 Ns=2 => H2=8 solve

Sunday 12-Jan-2025

... by: Envy E

+6 E9 ( +19 E2 E7 ) ( +49 F5 F7 ) +6 G3 +3 C3 +2 E3 +5 F3 +9 H3 +5 J2 +5 B1 +3 B4 +3 A9 +4 E9 -6 E9

With G9 set to 6 puzzle is solvable. 399 Extreme

Sunday 12-Jan-2025

... by: Frans Goosens

#628

A4=3 Wrong, Undo calculation
A4=5 ( C3=6 ) Solved,

Total solving time is : 42 sec.
Number of logical steps is : 4764

Saturday 11-Jan-2025

... by: Dieter

#628 - basics: A5=F6=1; A6=2; G1=H6=E5=7; J6=8; D5=3
strategy: try to get hidden pairs or triplets
E1 = (1,2,4,6)
after basic checks 1 matrix (E1=4) left
E1=4 & F8=6 solve

Saturday 11-Jan-2025

... by: Serban


# 628 A5=F6=1 A6=2 D5=3 G1=E5=H6=7 J6=8 Basics to 34

1. Number 3 n=4 e=5 N=14 Nc=6 Ns=1 => A2=3 solve

2. Number 6 n=3 e=6 N=19 Nc=11 Ns=10 => E2=6 solve

3. Row C n=4 e=5 Nc=5 Ns=3 => C3=6 solve

4. Row F n=4 e=5 Nc=12 Ns=11 => F2=9 solve
Page created on 03-May-2011, last modified on 30-May-2024.
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