... by: Frans Goosens
#621Combination 2-digits cells
C7=2 ( A9=3 ) Solved,
Total solving time is : 8 sec.
Number of logical steps is : 823
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#621, November 23 - November 29, 2024:
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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 24-Nov-2024
Combination 2-digits cells
C7=2 ( A9=3 ) Solved,
Total solving time is : 8 sec.
Number of logical steps is : 823
Saturday 23-Nov-2024
... by: Dieter
#621 - basics: D4=2; F3=7strategy: try to get hidden pairs or triplets
combinations of C2 / C7 = (2,3,6,8) / (2,4,8)
basic checks: 5 matrices left
C2=8 & C7=2 solve
Saturday 23-Nov-2024
... by: Serban
# 621 D1=F4=C6=B9=4 F1=1 F3=7 D4=2 Basics to 31
1. Number 5 n=3 e=6 N=16 Nc=9 Ns=3 => F2=5 solve
2. Number 7 n=5 e=4 N=23 Nc=13 Ns=3 => J6=7 basics to 36
--2a. X-chain x=2 => [B2,C25,J3,H9]<>2 => H2=B5=2 solve
3. Number 8 n=2 e=7 N=27 Nc=35 Ns=7 => C2=B8=8 solve