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
#654 - initially populated cells: 25 = 30,9%
No solver used.
basics: F4=5, J2=8
populated cells = 27 = 33,3%
Numbers 5,8,1,2,3,6,7 occur most frequently.
combinations of C6 = (5,8,9) and D6 = (1,2,3,9)
1 matrix remains after basic checks: C6/D6 = 5/1
C6/D6 = 5/1 & A7=2 solves.
Review:
A7=2 solves.
... by: Serban
# 654 D7=7 D9=3 F4=5 J2=8 Basics to 29
1. D6=1 solve
2. A7=2 OR H9=2 solve
3. A6=E4=3 solve
4. A2=5 solve
5.F1=C2=6 OR F1=A9=6 solve
