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
#660 - initially populated cells: 23 = 28,4%
No solver used.
basics: D5=4
populated cells: 24 = 29,6%
Strategy: Numbers 2,3,4,7 occur most frequently, combine two cells.
combinations of G7 = (4,6) and H8 = (1,2,5,6,7)
4 matrices remain after basic checks: G7/H8 = 4/1, 4/2, 6/2 and 4/7
G7/H8 = 4/2 solves with A3=9
Review:
A3=9 & H8 = 2 solve.
... by: Serban
# 660 D5=4 Basics to 24
1. Number 1 n=2 e=7 N=30 Nc=69 Ns=40 => F9=1 solve
2. Number 2 n=3 e=6 N=14 Nc=4 Ns=1 => J6=2 basics to 33
2a. X-chain x=8 => [EF4,FHJ5,B6,H8]<>8 => A5=8 solve
3 Number 5 n=2 e=7 N=32 Nc=38 Ns=36 => D8=5 solve
4. Number 9 n=2 e=7 N=29 Nc=38 Ns=36 => A3=H1=9 solv
Note: C3=5
... by: Yves
A2=2 F8=3 Solve
