... by: Dieter
#653 - populated cells = 24 = 29,6%basics: D2=1; E6=6; D7=7; F2=8
populated cells = 28 = 34,6%
combinations of J2 = (3,4,6,7) and G6 = (1,2,7) as numbers 6,1,2,7 are populated most.
No solver used: J2=3 & G6=7 solves.
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#653, July 5 - July 11, 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
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Discussion...
Post an idea here...Wednesday 9-Jul-2025
basics: D2=1; E6=6; D7=7; F2=8
populated cells = 28 = 34,6%
combinations of J2 = (3,4,6,7) and G6 = (1,2,7) as numbers 6,1,2,7 are populated most.
No solver used: J2=3 & G6=7 solves.
Wednesday 9-Jul-2025
... by: BGH
Single Step Solution after basics #6539 @ H2 (Column H Unit PAIR of 9's, one must be in the solution.)
Convergence
NOTE: This is a different solution to the 2 step solution I posted earlier.
Monday 7-Jul-2025
... by: Frans Goosens
#653Combination 2-digits cells
D3=5 Wrong, Undo calculation
D3=9 ( B9=7 ) Solved,
Total solving time is : 59 sec.
Number of logical steps is : 695
Sunday 6-Jul-2025
... by: BGH
2 step solution after basics1. 9 @ D3 (part of a triple of pairs in block R2C1) (Also hits the 29 pair @ D6)
2. 2 @ C1 (Clean up Block R3C1 & Column 1)
Convergence
Sunday 6-Jul-2025
... by: Serban
# 653 D2=1 D7=7 E6=6 F2=8 Basics to 281. Number 6 n=6 e=3 N=7 Nc=3 Ns=1 => H3=6 OR J7=6 basics to 43
---1a. B5=1 OR F4=1 solve
---2a. D6=2 solve
---3a. A8=3 OR B1=3 OR E9=3 OR F3=3 solve
---4a. J8=4 solve
---5a. any[A3,E1,B7,D8,G9]=5 solve
---6a. A5=7 solve
---7a. B4=J1=8 solve
---8a. A6=J4=9 solve
Saturday 5-Jul-2025
... by: Yves
B1=3 SolveSaturday 5-Jul-2025
... by: Dieter
#653 - populated cells = 24 = 29,6%basics: D2=1; E6=6; D7=7; F2=8
populated cells = 28 = 34,6%
combinations of A3 = (3,5,6,7) and G3 = (1,2,7) as numbers 6,1,2,7 are populated most.
No solver used: A3=5 & G3=1 solves.
Saturday 5-Jul-2025
... by: Serban
# 653 D2=1 D7=7 E6=6 F2=8 Basics to 281. Number 4 n=2 e=7 N=30 Nc=58 Ns=4 => J8=C1=4 OR J8=G2=4 basics to 41
1a.W-wing 79 [J4,A5] => H5<>9 => H5=2 solve
2. Number 5 n=2 e=7 N=19 Nc=10 Ns=7 => A3=C4=5 OR A3=B7=5 solve
Note : J5=5