... by: Frans Goosens
#682Combination 2-digits cells
B3=3 Wrong, Undo calculation
B3=4 ( E5=3 ) Solved,
Total solving time is : 41 sec.
Number of logical steps is : 5276
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#682, January 24 - January 30, 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...Saturday 24-Jan-2026
Combination 2-digits cells
B3=3 Wrong, Undo calculation
B3=4 ( E5=3 ) Solved,
Total solving time is : 41 sec.
Number of logical steps is : 5276
Saturday 24-Jan-2026
... by: Dieter
#682 - initially populated cells: 24 = 29,6 %No solver used, solver = brain.
basics: D8=7; A5=8; J5=2
populated cells: 27 = 33,3 %
Strategy: numbers 7,5,8 occur most frequently, combine two cells.
combinations of G1 = (2,3,4,6,8) and G7 = (1,4,6,8)
G1/G7 = 2/1 solves.
Saturday 24-Jan-2026
... by: Yves
#683Two one-Cell Solution
A9=9 or D9=1
Saturday 24-Jan-2026
... by: Serban
# 682 A5=8 D8=7 J5=2 Basics 271. Number 8 n=4 e=5 N=14 Nc=5 Ns=1 => F7=8 OR G9=8 solve
Note :B8=D1=H3=8
2. A1=3 solve
3. Number 4 n=3 e=6 N=22 Nc=23 Ns=8 => H2=4 solve