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#619, November 9 - November 15, 2024:
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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Wednesday 13-Nov-2024

... by: Serban


# 619 F3=5 F4=3 F7=C9=8 F8=4 A8=2 Basics to 29

1. Box 6 GHJ456 n=3 e=6 Nc=15 Ns=9 => H5=5 solve

2. Number 8 n=5 e=4 N=13 Nc=5 Ns=1 => G2=8 basics to 34
Note : J5=8 => E5=9

Monday 11-Nov-2024

... by: Serban


# 619 F3=5 F4=3 F7=C9=8 F8=4 A8=2 Basics to 29

1. Number 6 n=3 e=6 N=30 Nc=77 Ns=50 => H1=B8=6 solve

2. Number 7 n=3 e=6 N=21 Nc=13 Ns=8 => G9=7 & [B8=7 OR E7=7] solve

3. Number 9 n=2 e=7 N=27 Nc=34 Ns=23 => C4=9 & [J2=9 OR G7=9] solve

4. X-chain x=8 => J2<>8 => J2(3,7,9) A5(3,5,9) N=6 Nc=9 Ns=7 => A5=3 J2=9 solve

Sunday 10-Nov-2024

... by: James Havard

A5=3 with B1=3 gives a singles solution. 40 subs and 23 seconds to get 3 solution subs.

Saturday 9-Nov-2024

... by: Dieter

#619 - basics: row F complete; A8=2; C9=8
strategy: try to get hidden pairs or triplets
combinations of G4 / G9 = (1,2,7) / (1,7,9)
(G4=1 &) G9=7 solve, where G4 gets automatically populated if G9=7.

Saturday 9-Nov-2024

... by: Frans Goosens

#619

Combination 2-digits cells

A4=6 No solution, Undo calculation
A4=9 No solution, Undo calculation
D3=2 Wrong, Undo calculation
D3=3 No solution, Fixed
D7=6 ( E5=9 ) Solved,

Total solving time is : 48 sec.
Number of logical steps is : 6440

Saturday 9-Nov-2024

... by: Serban


# 619 F3=5 F4=3 F7=C9=8 F8=4 A8=2 Basics to 29

1. Number 1 n=3 e=6 N=12 Nc=4 Ns=3 =>
D2=1 & [C1=1 OR B5==1 OR H9=1 OR G4=1 ]
OR E8=1 & [C1=1 OR B5==1 OR H9=1 OR G4=1 ] solve

2. Number 5 n=4 e=5 N=14 Nc=8 Ns=2 => G1=H5=5 OR H5=J8=5 solve
Page created on 03-May-2011, last modified on 30-May-2024.
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