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PostPosted: Mon Sep 04, 2023 3:51 am 
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Addict
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Joined: Fri Jun 23, 2023 4:24 am
Posts: 24
Would someone please let me know if the Daily Hard Killer Sudoku Puzzle, dated Saturday 2nd September 2023, on puzzlemadness.co.uk was a difficult puzzle. I worked on it for more hours than I care to share before finally solving it.


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PostPosted: Mon Sep 04, 2023 6:49 pm 
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Grand Master
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Joined: Wed Apr 16, 2008 1:16 am
Posts: 1044
Location: Sydney, Australia
Attachment:
02-09-23Hard.png
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Sept 2 Hard

triple click code:
3x3::k:4352:6401:6401:3330:3330:3330:3075:3075:3075:4352:6401:6401:4612:2821:2821:2821:2821:4358:4352:4612:4612:4612:5639:5639:5639:4358:4358:3336:4617:2570:2570:3851:3851:3851:4620:3853:3336:4617:6158:6158:6158:6158:6158:4620:3853:3336:4617:3855:3855:3855:1808:1808:4620:3853:4369:4369:3602:3602:3602:6419:6419:6419:4372:4369:5909:5909:5909:5909:6419:3606:3606:4372:3351:3351:3351:3096:3096:3096:3606:3606:4372:

It was resistant until I saw the not-so-easy-to-see key step which opened it. SudokuSolver gives it 1.05 so harder than any of the others you've worked on here.
key step:
"45" on r9: 4 outies r7c9 + r8c789 = 11 = {1235} only: all locked for n9

Cheers
Ed


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