... by: Frans Goosens
#655B9=1 Wrong, Undo calculation
B9=4 ( H5=9 ) Solved,
Total solving time is : 5 sec.
Number of logical steps is : 327
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#655, July 19 - July 25, 2025:
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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.Share and Enjoy
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Discussion...
Post an idea here...Monday 21-Jul-2025
B9=1 Wrong, Undo calculation
B9=4 ( H5=9 ) Solved,
Total solving time is : 5 sec.
Number of logical steps is : 327
Saturday 19-Jul-2025
... by: Serban
# 655 A3=F8=2 E1=1 E5=3 Basics to 281. Number 1 n=3 e=6 N=21 Nc=16 Ns=7 => J9=1 solve
2. Number 2 n=6 e=3 N=7 Nc=3 Ns=3 => J2=2 OR H9=2 solve
3. Number 4 n=3 e=6 N=20 Nc=11 Ns=8 => H8=4 solve
Note: G2=4
4. Number 6 n=3 e=6 N=19 Nc=8 Ns=1 => H2=6 solve
Saturday 19-Jul-2025
... by: Dieter
#655 - initially populated cells: 24 = 29,6%No solver used.
basics: A3=F8=2; E5=3
populated cells: 27 = 33,3%
Numbers 2,3,4,5,6 occur most frequently.
combinations of H4 = (1,2,3) and H8 = (4,6,8)
H4=1 & H8=4 solve.
Review:
H8=4 solves.