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
#669 - initially populated cells: 22 = 27,2%
No solver used.
basics: %
Strategy: Numbers 5,6,7,9 occur most frequently, combine two cells.
combinations of B6 = (1,3,5,6) and B8 = (3,4,6,7)
5 matrices left after basic checks.
B6 /B8 = 5/6 solves with E1=8.
Optimization:
B6=5 & E1=8 solve.
... by: Serban
# 669 Basics to 22
1. J1=1 & G1=6 solve
2. J1=1 & E2=9 solve
3. Number 6 n=3 e=6 N=18 Nc=11 Ns=4 => E6=J7=6 solve
Note : D3=6
