# #532, January 21 - January 27:The Weekly 'Unsolvable' Sudoku Puzzle

by Richard KrĂ¶ger, 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.

## 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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# Discussion...

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## ... by: Frans Goosens

Combination 2-digits cells

A5=1 No solution, Undo calculation
A5=4 No solution, Undo calculation
C6=7 No solution, Undo calculation
C6=8 No solution, Undo calculation
F3=8 No solution, Undo calculation
F3=9 No solution, Undo calculation
H1=3 No solution, Undo calculation
H1=9 No solution, Undo calculation
I2=1 No solution, Undo calculation
I2=5 Wrong, Undo calculation
I2=1 No solution, Fixed
A5=1 Wrong, Undo calculation
A5=4 ( F3=8 ) Solved,

#532--------------------------Solution
090 003 700-------------692 843 751
000 050 004-------------873 156 924
001 200 060-------------451 297 863

045 060 000-------------145 968 237
030 004 000-------------937 524 186
200 700 000-------------268 731 495

000 009 300-------------524 619 378
006 000 010-------------386 472 519
700 080 002-------------719 385 642

Total solving time is : 63 sec.
Number of logical steps is : 13430

## ... by: Serban

# 532 E3=7 Basics to 23

1. Number 9 n=2 e=7 N=28 Nc=19 Ns=10 => E1=B7=9 solve
2. Box 3 GHJ123 n=2 e=7 Nc=26 Ns=10 => G1=5 & H2=8 &[ H1=3 OR J3=9 ] solve
3. Row J n=3 e=6 Nc=16 Ns=9 => J4=3 & J6=5 solve
4. Column 1 n=2 e=7 Nc=40 Ns=10 => E1=9 & B1=8 solve

## ... by: Valery

File "#532".
Trial and error.
Total solving time is: 3 sec.
The number of cycles: 34.

1. set A5 = 1
2. set D8 = 3
3. error. set D8 = 7
4. error. set A5 = 4
5. set J3 = 9
6. set J6 = 5
The number of selected cells: 3.

090 003 700..........692 843 751
000 050 004..........873 156 924
001 200 060..........451 297 863

045 060 000..........145 968 237
030 004 000..........937 524 186
200 700 000..........268 731 495

000 009 300..........524 619 378
006 000 010..........386 472 519
700 080 002..........719 385 642

## ... by: James Havard

Top box row 57 subs 76 seconds to get 5 solution subs. Middle box row 20 subs 40 seconds to get 3 solution subs. Trial and error found two together to get a singles solution. B1=8 with E9=6.