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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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Sunday 6-Jul-2025

... by: BGH

2 step solution after basics
1. 9 @ D3 (part of a triple of pairs in block R2C1) (Also hits the 29 pair @ D6)
2. 2 @ C1 (Clean up Block R3C1 & Column 1)
Convergence

Sunday 6-Jul-2025

... by: Serban

# 653 D2=1 D7=7 E6=6 F2=8 Basics to 28
1. Number 6 n=6 e=3 N=7 Nc=3 Ns=1 => H3=6 OR J7=6 basics to 43
---1a. B5=1 OR F4=1 solve
---2a. D6=2 solve
---3a. A8=3 OR B1=3 OR E9=3 OR F3=3 solve
---4a. J8=4 solve
---5a. any[A3,E1,B7,D8,G9]=5 solve
---6a. A5=7 solve
---7a. B4=J1=8 solve
---8a. A6=J4=9 solve

Saturday 5-Jul-2025

... by: Yves

B1=3 Solve

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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