... by: blueb
#650The first 5 steps are easy.
then a swordfish on 9s.
row 2, 4, 8.
A8 = 9
then easy steps.
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#650, June 14 - June 20, 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 15-Jun-2025
The first 5 steps are easy.
then a swordfish on 9s.
row 2, 4, 8.
A8 = 9
then easy steps.
Saturday 14-Jun-2025
... by: Dieter
#650 - populated cells = 24 = 29,6%basics: D7=2, D8=3, F8=8, E3=9
populated cells = 28 = 34,6%
strategy: try to get hidden pairs or triplets. No solver used.
combinations of E5 = (1,4,8) and J5 = (2,8,9) as numbers 2,4,9 are populated most.
1 matrix left after basic checks: E5/J5 = (4/8)
Solves with A8=9.
Review:
J5=8 & A8=9 or E5=4 & A8=9 solve.
Saturday 14-Jun-2025
... by: Hrudaya
A8=9, C7=7Saturday 14-Jun-2025
... by: Serban
# 650 D7=2 D8=3 E3=9 F8=8 Basics to 281. Number 3 n=3 e=6 N=22 Nc=23 Ns=23 => C3=3 solve
2. Number 6 n=3 e=6 N=23 Nc=30 Ns=15 => F3=6 solve
3. Number 7 n=2 e=7 N=29 Nc=40 Ns=2 => A1=7 solve
4. Number 9 n=4 e=5 N=15 Nc=6 Ns=2 => J9=9 solve