... by: K9Dr
Using my previously detailed self-written computer code.246 steps. 37 Trials, 31 errors. Solving time: 0.9 seconds
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#719, October 10 - October 16, 2026:
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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). |
Changes March 2026
Due to the introduction of Forcing Nets many Weekly Unsolvable puzzles can now be solved. I have flagged all the Sudoku ones which are solvable. I am struggling to make any new ones so we'll have to see if the Weekly can continue. The point of the Weekly was to provoke discussion and new ideas, so that is progress. But my solution is unlikely to be optimal so alternatives are welcome.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...Saturday 10-Oct-2026
246 steps. 37 Trials, 31 errors. Solving time: 0.9 seconds
Saturday 10-Oct-2026
... by: Frans Goosens
#719With trial and error
Combination C3=179 and H7=139
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C3=1 H7=1 Wrong, Undo calculation
All reset to initial position
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C3=1 H7=3 Wrong, Undo calculation
All reset to initial position
************************************************************
C3=1 H7=9 Wrong, Undo calculation
All reset to initial position
************************************************************
C3=7 H7=1 ( G8=5 ) Solved,
Total solving time is : 89 sec.
Number of logical steps is : 12667
Saturday 10-Oct-2026
... by: Serban
# 719 Basics to 221. A2=D1=1 solve
2. A2=1 & B9=4 solve