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#545, June 10 - June 16:
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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Saturday 10-Jun-2023

... by: Serban

% 545
1. Column 3 n=4 e=5 Nc=14 Ns=13 => B3=2 & C3=1 solve

2. Box 1 ABC123 n=2 e=7 Nc=34 Ns=22 => A1=4 & C2=9 solve
3. Box 5 DEF456 n=3 e=6 Nc=22 Ns=8 => D4=5 & E5=6 basics to 67
3a. BUG+1 => F3=4 solve
3b. X-chain x=4 => [F1,BD3,F8,A9] <>4 => A1=4 solve

Saturday 10-Jun-2023

... by: Valery

File "#545".
Total solving time is: 6 sec.
The number of cycles: 49.

Trial and error.
Number of selected cells 4:
A2=8 A5=2 G7=4 G9=8

007 300 090..........487 325 196
600 001 000..........632 891 547
000 040 800..........591 746 823

900 007 000..........926 517 384
003 200 000..........873 264 915
050 080 000..........154 983 762

205 009 070..........265 139 478
040 050 001..........749 658 231
008 000 600..........318 472 659

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