... by: Dieter
#661 - initially populated cells: 22 = 27,2%No solver used.
basics: %
Strategy: Numbers 3,4,6,8 occur most frequently, combine two cells.
combinations of G3 = (2,6,8) and G5 = (1,3,4,6)
G3/G5 = 6/1 solve.
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#661, August 30 - September 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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Post an idea here...Saturday 30-Aug-2025
No solver used.
basics: %
Strategy: Numbers 3,4,6,8 occur most frequently, combine two cells.
combinations of G3 = (2,6,8) and G5 = (1,3,4,6)
G3/G5 = 6/1 solve.
Saturday 30-Aug-2025
... by: Serban
# 661 Basics to 221. Number 1 n=2 e=7 N=28 Nc=28 Ns=28 => D8=G5=1 solve
Note: F2=C6=A9=1
2. Number 4 n=3 e=6 N=21 Nc=19 Ns=54 =>G1=H9=4 basics to 37
2a. X chain x=1=>[]<>1=> H1=1 solve
3. Number 9 n=2 e=7 N=28 Nc=27 Ns=3 => E9=H7=9 basics to 51
3a. X chain x=2=>[G3,C4,D5,F7]<>2 =>C3=2 solve