... by: BGH
Basics 30.9%2 Step solution
2 @ H2 Cell Pair 27 >> 32.1%
1 @ F2 Cell Pair 17 exposed by step 1 >> Solution
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#674, November 29 - December 5, 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...Saturday 29-Nov-2025
2 Step solution
2 @ H2 Cell Pair 27 >> 32.1%
1 @ F2 Cell Pair 17 exposed by step 1 >> Solution
Saturday 29-Nov-2025
... by: Yves
E1=2 And (A1=6 Or B3=2) SolveSaturday 29-Nov-2025
... by: Yves
A1=6 & E=2 SolveSaturday 29-Nov-2025
... by: Dieter
#674 - initially populated cells: 24 = 29,6%No solver used, solver = brain.
basics: H1=4
populated cells: 25 = 30,9%
Strategy: Numbers 4,2,5,6,9 occur most frequently, combine two cells.
combinations of G5 = (5,6,9) and G9 = (1,6,7,9)
3 matrices left after basic checks: G5/G9 = 5/6, 6/9 and 9/1
G5/G9 = 5/6 solve with B8=5
Optimization:
B8=5 & G9=6 solve.
Saturday 29-Nov-2025
... by: Serban
# 674 H1=4 Basics to 251. Column 2 n=4 e=5 Nc=7 Ns=3 => D2=7 solve
Note: H2=2
2. Box 3 ABC123 n=3 e=6 Nc=10 Ns=3 => H3=6 & [G3=1 OR J2=5] solve
3. Number 2 n=3 e=6 N=21 Nc=13 Ns=12 => B3 & [D4 OR E1]=2 solve
Note: H2=2