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
#671 - initially populated cells: 23 = 28,4%
No solver used.
basics: C4=B3=J7=1; F9=6; F5=7
populated cells: 28= 34,6%
Strategy: Numbers 1,6,2,3,4,7 occur most frequently, combine two cells.
combinations of A4 = (4,5,6,7) and A7 = (3,6,8)
A4=5 solves.
... by: Serban
# 671 B3=C4=J7=1 F5=7 F9=6 Basics to 28
1. H5=3 solve
2. A4=5 OR G6 =5 solve
3. A7=6 OR C2=6 OR H1=6 solve
