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
#670 - initially populated cells: 23 = 28,4%
No solver used.
basics: A4=2; G5=5
populated cells: 25= 30,9%
Strategy: Numbers 5,3,4,8,9 occur most frequently, combine two cells.
combinations of A3 = (4,5,7,8) and A7 = (1,3,5)
A3=8 & A7=1 solve.
... by: Serban
# 670 A4=2 G5=5 Basics to 25
1. Box 4 ABC456 n=4 e=5 Nc=12 Ns=2 => B4=7 & [C5=1 OR C6=6] solve
2. Box 6 GHJ456 n=4 e=5 Nc=10 Ns=5 => G6=1 & H6=7 solve
3. Number 4 n=3 e=6 N=20 Nc=17 Ns=3 => D5=G3=4 solve
Note: A1=G3=J6=4
