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
#678 - initially populated cells: 24 = 29,6 %
No solver used, solver = brain.
basics: A6=2; C9=4; C4=6; A8=7
populated cells: 28 = 34,6 %
Strategy: numbers 2,7,4 occur most frequently, combine two cells.
combinations of G1 = (2,3,6) and G5 = (4,5,7,9)
after basic checks 3 matrices G1/G5 left: 2/7, 3/7 and 6/7 > G5=7
G1/G5 = 6/7 solves with G4=5
Optimization:
G1=6 & G4=5 solve.
... by: Serban
# 678 A6=2 A8=7 C4=6 C9=4 basics 28
1. Number 8 n=2 e=7 N=28 Nc=42 Ns=41 => J8=8 OR D7=8 solve
2. Number 5 n=2 e=7 N=27 Nc=39 Ns=23 => C6=5 OR D8=5 solve
... by: Serban
# 678 A6=2 A8=7 C4=6 C9=4 basics 28
1. Number 8 n=2 e=7 N=28 Nc=42 Ns=41 => J8=8 solve
