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
#643 - basics: %
populated cells: 21 = 26%
strategy: try to get hidden pairs or triplets. No solver used.
combinations of A4 = (3,6,7,9) and A9 = (2,6,7,9)
5 matrices left after basic checks.
start with A4/A9 =(7/6), 58% populated: solves with A5=5
... by: Serban
# 643 Basics to 21
1. Row B n=3 e=6 Nc=24 Ns=18 => B3=9 & B5=8 solve
2. Box 4 ABC456 n=2 e=7 Nc=38 Ns=13 => A6=9 & B5=8 solve
