Archive
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.
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... by: Dieter
#653 - populated cells = 24 = 29,6%
basics: D2=1; E6=6; D7=7; F2=8
populated cells = 28 = 34,6%
combinations of A3 = (3,5,6,7) and G3 = (1,2,7) as numbers 6,1,2,7 are populated most.
No solver used: A3=5 & G3=1 solves.
... by: Serban
# 653 D2=1 D7=7 E6=6 F2=8 Basics to 28
1. Number 4 n=2 e=7 N=30 Nc=58 Ns=4 => J8=C1=4 OR J8=G2=4 basics to 41
1a.W-wing 79 [J4,A5] => H5<>9 => H5=2 solve
2. Number 5 n=2 e=7 N=19 Nc=10 Ns=7 => A3=C4=5 OR A3=B7=5 solve
Note : J5=5