... by: Frans Goosens
#673Combination 2-digits cells
A3=3 ( F4=3 ) Solved,
Total solving time is : 12 sec.
Number of logical steps is : 1056
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#673, November 22 - November 28, 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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Post an idea here...Saturday 22-Nov-2025
Combination 2-digits cells
A3=3 ( F4=3 ) Solved,
Total solving time is : 12 sec.
Number of logical steps is : 1056
Saturday 22-Nov-2025
... by: Dieter
#673 - initially populated cells: 24 = 29,6%No solver used, solver = brain.
basics: D7=4, E8=6, F9=7
populated cells: 27 = 33,3%
Strategy: Numbers 7,4,9,2,6 occur most frequently, combine two cells.
combinations of A4 = (4,7,9) and F1 = (2,5,6)
2 matrices left after basic checks: A4/F1 = 7/2 and 9/5
A4/F1 = 7/2 solves with F4=3
Optimization:
F1=2 & F4=3 solve.