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groston
PostPosted: Wed Sep 13, 2023 5:02 pm 
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I hate to admit this, but I am stuck on the 12 Sep 2023 DailyKillerSudoku.com difficulty 10/10 puzzle, puzzle number 26215. The attached image shows as far as I have gotten. Would some kind person please suggest the next step or two for me to take. I have checked each cage, looked for hidden doubles and triples, used the rule of 45 on the nonets, rows, groups of rows, etc., but have no idea how to proceed.


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DailyKillerSudoku_26215.jpg
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Ed
PostPosted: Wed Sep 13, 2023 8:19 pm 
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OK, this one is a big step up from the others you've put up here - at least according to SudokuSolver. It gives it 1.30. From looking at the two solver log summaries you are going to need to use killer subsets. It could take hours to solve so I don't have time now.
sudokuSolver log summary:
Puzzle Completed. Step Analysis:
6 Find Hidden Cages 4
5 Find Hidden Cages 3
10 Find Hidden Cages
70 Naked Singles
10 Naked Pairs
6 Naked Triples
3 Naked Quads
4 Hidden Singles
4 Locked Cages 2
5 Locked Candidates (Box/Line)
10 Cage Blockers
2 Cage Placement 1
5 Cage Placement
3 Killer Pairs
16 Cage Combinations
16 Cage Combinations Extended
3 45 Rule Two Innies/Outies 2
2 45 Rule Two Innies/Outies
4 45 Rule Single House 4
1 45 Rule Single House 3
74 Cage Cleanup 2
1 Cage Cleanup 1
66 Cage Cleanup
1 Hidden Killer Pairs
1 Locked Candidates (House/Cage)
3 Forced Cage Candidates
1 Forced Cage Candidates - Extended
2 45 Rule Two Innies&Outies 2
3 45 Rule Single House Innies&Outies 4
2 45 Rule Single House Innies&Outies 3
Total solving time (seconds): 0.62
Calculated score: 1.30
JSudoku log summary:
Techniques used:
77 Naked Single
4 Hidden Single
5 Unique Pair
3 Naked Pair
1 Hidden Pair
3 Unique Triplet
13 Intersection
1 Naked Triplet
21 Odd Pairs
24 Odd Triplets
5 Double Innies & Outies
4 Mandatory Inclusion
1 Unique Quad
6 Odd Quads
1 Complex Intersection
6 Triple Innies & Outies
3 Double Outies minus Innies
3 Complex Naked Pair
1 Complex Hidden Pair
3 Conflicting Pair
7 Quadruple Innies & Outies
4 Triple Outies minus Innies
1 Pointing Pair
1 Locked Cages
1 Complex Naked Triplet
2 Multiple Innies & Outies
triple click code:
3x3::k:3840:3840:3841:3586:3586:3586:3586:7939:7939:3840:3840:3841:5893:2566:2566:7939:7939:7939:3844:3844:5893:5893:6919:3336:7939:7939:6153:3844:4106:4106:4106:6919:3336:3336:2571:6153:4108:2061:1806:1806:6919:1808:1808:2571:6153:4108:2061:3855:3855:6919:3857:3857:3857:3858:4108:9492:9492:3855:6919:3091:3091:3858:3858:9492:9492:9492:3093:3093:3091:2838:4631:4631:9492:9492:4888:4888:4888:4888:2838:4631:4631:
Cheers
Ed
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groston
PostPosted: Wed Sep 13, 2023 8:46 pm 
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Thank you. The key is 'killer subsets'. I googled, found this page http://sudopedia.enjoysudoku.com/Killer_Subset.html, and now I have something to look for.
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