... by: Frans Goosens
#683Combination 2-digits cells
B1=1 Wrong, Undo calculation
B1=5 ( D3=2 ) Solved,
Total solving time is : 24 sec.
Number of logical steps is : 3096
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#683, January 31 - February 6, 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). |
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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...Thursday 5-Feb-2026
Combination 2-digits cells
B1=1 Wrong, Undo calculation
B1=5 ( D3=2 ) Solved,
Total solving time is : 24 sec.
Number of logical steps is : 3096
Monday 2-Feb-2026
... by: Yves
F3=8 (F4=5)Saturday 31-Jan-2026
... by: Dieter
#683 - initially populated cells: 25 = 30,9 %No solver used, solver = brain.
basics: B5=G1=8
populated cells: 27 = 33,3 %
Strategy: numbers 8,4,5,6,7 occur most frequently, combine two cells.
combinations of D6 = (4,5,7,8) and A6 = (3,5,6)
D6=8 solves.
Saturday 31-Jan-2026
... by: Yves
#6833 Solutions one Cell
A3=1 or B7=1 or F6=3
Saturday 31-Jan-2026
... by: Serban
# 683 B5=G1=8 Basics 271. A3=1 solve
2. F6=3 solve
3. C8=6 solve
4. J 7=7 solve
5. D6=8 OR F4=8 solve