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
#659 - initially populated cells: 23 = 28,4%
No solver used.
basics: %
Strategy: Numbers 1,4,5,6,9 occur most frequently, combine two cells.
combinations of E7 = (1,4,7,9) and J7 = (1,5,6,8)
3 matrices remain after basic checks: E7/J7 = 1/6, 4/6 and 7/6 > J7=6
E7/J7 = 4/6 solves with F2=8 & G3=4
Review:
F2=8 & G3=4 solve.
... by: Serban
# 659 Basics to 23
1. Box 3 GHJ123 n=3 e=6 Nc=34 Ns=30 => G2=9 & H3=3 solve
Note: H1=5 J1=1 J2=7
2. Box 4 ABC456 n=3 e=6 Nc=38 Ns=2 => A4=3 & C6=2 solve
Note: A5=9 B5=1
3. Number 3 n=2 e=7 N=30 Nc=76 Ns=28 => C1=G9=3 OR G9=J5=3 solve
