... by: Serban
# 681 B5=D6=8 B8=F1=1 Basics 281. Number 6 n=2 e=7 N=26 Nc=24 Ns=17 => D3&[J9 OR C7]=6 solve
2. C7=4 & A2=6 solve
correction 3. F1=9 solv
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#681, January 17 - January 23, 2026:
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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
Supporter Members have access to all these puzzles going back to number 1.
Discussion...
Post an idea here...Saturday 17-Jan-2026
1. Number 6 n=2 e=7 N=26 Nc=24 Ns=17 => D3&[J9 OR C7]=6 solve
2. C7=4 & A2=6 solve
correction 3. F1=9 solv
Saturday 17-Jan-2026
... by: Serban
# 681 B5=D6=8 B8=F1=1 Basics 281. Number 6 n=2 e=7 N=26 Nc=24 Ns=17 => D3&[J9 OR C7]=6 solve
2. C7=4 & A2=6 solve
3. D1=9 solve
Saturday 17-Jan-2026
... by: Frans Goosens
#681Combination 2-digits cells
B9=4 Wrong, Undo calculation
B9=9 No solution, Fixed
C3=6 Wrong, Undo calculation
C3=9 ( C7=6 ) Solved,
Total solving time is : 59 sec.
Number of logical steps is : 7251
Saturday 17-Jan-2026
... by: Dieter
#681 - initially populated cells: 24 = 29,6 %No solver used, solver = brain.
basics: F1=B8=1; B5=D6=8
populated cells: 28 = 34,6 %
Strategy: numbers 1,8,3,5,7 occur most frequently, combine two cells.
combinations of B7 = (3,4,7,9) and C7 = (3,5,6,9)
B7/C7 = 4/6 solves.