... by: Frans Goosens
#676A2=2 No solution,
All reset to initial position
A2=3 ( E7=7 ) Solved,
Total solving time is : 45 sec.
Number of logical steps is : 2173
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#676, December 13 - December 19, 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). |
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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...Sunday 14-Dec-2025
A2=2 No solution,
All reset to initial position
A2=3 ( E7=7 ) Solved,
Total solving time is : 45 sec.
Number of logical steps is : 2173
Saturday 13-Dec-2025
... by: Yves
one solving solution pairs : A6=7 & F8=8Saturday 13-Dec-2025
... by: Dieter
#676 - initially populated cells: 25 = 30,9 %No solver used, solver = brain.
basics: %
Strategy: numbers 1,2,5,6,7,8 occur most frequently, combine two cells.
combinations of H5 = (1,5,8) and H6 = (1,6,7,8)
after basic checks 2 matrices H5/H6 left: 5/6 and 8/6 > H6=6
H5/H6 = 5/6 solves with H1=4.
Optimization:
H1=4 & H5=5 solve.
Saturday 13-Dec-2025
... by: Serban
# 676 Basics to 251. Number 4 n=2 e=7 N=27 Nc=40 Ns= 37 => J8=4 solve
2. Number 5 n=3 e=6 N=22 Nc=16 Ns=7 => J3=5 solve