... by: Serban
# 642 Basics to 21
1. Number 7 n=3 e=6 N=16 Nc=5 Ns=1 => [F9 OR J3]=7 basics to 34
1a. if H1=6 solve
1b. if. G5=6 solve
1c. if A7=8 solve
correction
1. Number 5 n=3 e=6 N=23 Nc=35 Ns=31 => A3=F2=D9=5 solve
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#642, April 19 - April 25, 2025:
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WARNING: This is the Weekly 'Unsolvable' Sudoku, rated above 'Extreme'. This is currently unsolvable by my solver, except perhaps with trial and error strategies. Using the solver will not help you. (much). |
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.Share and Enjoy
Supporter Members have access to all these puzzles going back to number 1.
Discussion...
Post an idea here...Sunday 20-Apr-2025
# 642 Basics to 21
1. Number 7 n=3 e=6 N=16 Nc=5 Ns=1 => [F9 OR J3]=7 basics to 34
1a. if H1=6 solve
1b. if. G5=6 solve
1c. if A7=8 solve
correction
1. Number 5 n=3 e=6 N=23 Nc=35 Ns=31 => A3=F2=D9=5 solve
Saturday 19-Apr-2025
... by: Dieter
#642 - basics: %strategy: try to get hidden pairs or triplets. No solver used.
combinations of C6 = (2,7,8) and A9 = (3,4,6,7,8)
2 matrices left after basic checks: C6 / A9 = (7 / 3) and (8 / 8)
C6/A9 = (7/3) solves with G5=6
Saturday 19-Apr-2025
... by: Serban
# 642 Basics to 211. Number 2 n=2 e=7 N=29 Nc=41 Ns=1 => B4=H6=2 solve
2. Number 5 n=2 e=7 N=29 Nc=35 Ns=31 => A3=F2=D9=5 solve
3. Number 8 n=2 e=7 N=28 Nc=35 Ns=15 => A7=C2=8 solve