The hardest sudokus (new thread)

Everything about Sudoku that doesn't fit in one of the other sections

Re: The hardest sudokus (new thread)

Postby coloin » Mon Aug 19, 2024 1:24 pm

If it helps ... only these ones are new ... and could be used as furthur seeds i guess
Hidden Text: Show
Code: Select all
1.3.56....567.....78.1.3..5.35..7...61...83..8.73...1..68.........8..9.6......2..
1.3.56....5678....78.1.3..5.35..7...61....3..8.73...1..68.........8..9.6......2..
1.3.56....5678....78.1.3..5.35..7...61...83..8.73...1..68............9.6......2..
1.3.56....5678....78.1.3..5.35..1...67...83..8.13...7..68............9.6......2..
1.3.5...9.5.1....669.73...5.......43......8..7.......1.7.6......6139....9.5..1...
1.3.5...9.5.1....669.73...5.......43......8..7.......1.7.6.5....6139....9....1...
1.3.5...9.5.1....669.73...5.......43......8..7.......137.6......6139......5..1...
1...567....718....68.3.75.........4.36....8.7........251..3....7.8.65....368.1..5
1...567...5.18....68.3.75.........4.36....8.7........251..3....7.8.65....368.1..5
....567....718....68.3.75.........4.361...8.7........251..3....7.8.65....368....5
....567...5.18....68.3.75.........4.361...8.7........251..3....7.8.65....368....5
.234..7..4.7..9.3.69.......26....3......6.85...........7.24.....46.93...9..6.7..3
.234..7..4.7..9.3.69.......26....3......6.85..........37.24.....46.93...9..6.7...
.234.67..4.7..9.3..9.......26....3......6.85...........7.24.....46.93...9....7..3
.234.67..4.7..9.3..9.......26....3......6.85..........37.24.....46.93...9....7...
1.3.56....567.....78.1.3..5.35..1...67...83..8.13...7..68.........8..9.6......2..
1.3.56....5678....78.1.3..5.35..1...67....3..8.13...7..68.........8..9.6......2..

It tends to be the11.7 which have the high BxB however....
the first 4 are bxb=6
The next ones seem to be higher !
coloin
 
Posts: 2455
Joined: 05 May 2005
Location: Devon

Re: The hardest sudokus (new thread)

Postby Paquita » Mon Aug 19, 2024 1:47 pm

Hi coloin

I wonder where the ones that were known to you are published? Because it seems I am missing some files in my collection....and I marked those as new.
Paquita
 
Posts: 130
Joined: 11 November 2018

Re: The hardest sudokus (new thread)

Postby coloin » Mon Aug 19, 2024 2:08 pm

The first 3 have got 22 clues or so so should be in the original big file by champagne....
the others I would have to dig deeper
Hidden Text: Show
Code: Select all
.2.4....9..7....3.6...7.1...4......87.....5....5.1..6.3...6..5......8..2...9.....## 21  ED=11.8/11.8/10.7
.2.4.........89......23.6....5....9..3..4.2..7.......1..1....5..6.3..8..9.......7## 21  ED=11.8/11.8/10.4
...4....9....8.2..6....3.1..7...5.6....9..8......2...45.8......76...1....3.....7.## 21  ED=11.8/11.8/11.1
....567.....1.9...6...7......4.....13...6.9...8.....2.5....73....2.....8.1.....4.## 21  ED=11.8/11.8/11.2
.2.4..7....6.....17...3......5....6..4.2..9.......5..8..1..8....9..7.......92.3..## 21  ED=11.8/11.8/9.8 
1......8......92....6.3...52....8.....5.7.....6.5....4..47...........91..3..6...7## 21  ED=11.8/11.8/2.6 
1.......9.5....2....87...4.2...3......48.5....8.6...7...6..4.5.........1....9.3..## 21  ED=11.8/11.8/7.9 
....56......1....6.8.3.7....6...3..75......2...4...9...1.7....8..2....4.9.....5..## 21  ED=11.8/11.8/10.4
.2.....8....7...23......5.6..4.1.....6.3....29....5....7.8...6.5....4.....1.9....## 21  ED=11.8/11.8/10.8
.....678........327.....5....1.4.....9.2.....6....7.5.3....58....29......4..1....## 21  ED=11.8/11.8/3.4 
1......89.....91.3.......6...7.4....3....1..5.6.2.....5....89...4..7......26.....## 21  ED=11.8/11.8/3.4 
1.......9..67...2..8....4......75.3...5..2....6.3......9....8..6...4...1..25...6.## 22  ED=11.8/11.8/11.6
..3.5.7..4....9...6..2.......5...8.3.9.....6.8..........8.1...75....4.2.....3.5.8## 22  ED=11.8/11.8/2.6 
...4...8......92..6...7...5...8...9......24...3..1...7316......57.........2.6...3## 22  ED=11.8/11.8/11.7
.2...67..4...8......93........9..57..1...7..2......61.3...4..6...8.......6...5.2.## 22  ED=11.8/11.8/11.5
.2.4....9..7.8.2..6.....1.........93.....5.2..9.2..4..5....7....1.3...4...8.6....## 22  ED=11.8/11.8/9.4 
.2.....894......3...9.7.5......6.9..3.......2.8...2.4...16......7..1..9....5..1..## 22  ED=11.8/11.8/2.6 
..345........89......23.5...1......7..4..28..9......6...2..84..6......9..7......1## 22  ED=11.8/11.8/11.4
...4.6.....6..9.2.7...1.....1..3.4....96...5.8.......7.3......8..2..49.....5...4.## 22  ED=11.8/11.8/10.6
......7.9...1...3..8...74...9....5.4.....5..75.6....2...1.6......23.....94...8...## 22  ED=11.8/11.8/2.6 
.2...6......1...3...9.7...5..8....57.3.....1.7...4.8....4.9.5...6.2.....9.......8## 22  ED=11.8/11.8/10.0
..34...8.......1.37........2...9.......5..8...6...7.4...51....8.7...5...9...62.5.## 22  ED=11.8/11.8/2.6 
1....6.8....7..1........5.6..9.4.....7.2...3.8....76..3....1..5.4.9.......2.7....## 22  ED=11.8/11.8/11.6
...4....9.....9.327...3.5..2......6...1.....8.3....25...41.8...6.........1.9.4...## 22  ED=11.8/11.8/2.6 
.2...6..94.7....3..9.....5..6...85..3..........1.7.......9..8.2...8.2..5....1..4.## 22  ED=11.8/11.8/2.6 
1....6....5...9.6.8..23.....9....54.3.......2.15...6..........7...37......1..4.5.## 22  ED=11.8/11.8/2.6 
1..4.......6.8...278...3....3..6...7..7..2...9......5....1..4..5......9..7...8..3## 22  ED=11.8/11.8/10.5
.2.4....9..7......6....2.5....91.....3...4..1...3..8....5....7..1..4...28.2...6..## 22  ED=11.8/11.8/11.4
.....67.....1...3...9.2...4.4..9......5..2...89......5.3.....6...8.4...29....71..## 22  ED=11.7/11.7/3.4 
.2......94...8.1....9.....6....483....16...97....1..6.3....1...5....4....72......## 22  ED=11.8/11.8/2.6 
...4...8...7..92......3...526...1.....19......7....1..5......4..1.8....3..6..29..## 22  ED=11.8/11.8/9.9 
.....6..94...8.2.....7...1.2.9...8....4.3.9...6.....5.3.8.4.....4.5......7...1...## 22  ED=11.8/11.8/3.4 
1....6.......8.2...9.7....5.7.3...5.....716....4....73..59....48...2.....3.......## 22  ED=11.8/11.8/9.8 
....5...9...7...3..8...1......3...7...8..24..6...9...5..2....548....42...14......## 22  ED=11.8/11.8/9.7 
..3..6.8....1......9..7...4...8..6..3...4...2.....5.1...2.9...373.......94....5..## 22  ED=11.8/11.8/3.4 
..3.....94...8.2...6.7...1.2...9...8..4...3.......1.5.3.8.4.....4.6......7...5...## 22  ED=11.6/11.6/2.6 
..3..6......1...3.9...7...42.....84..4..9...7..5....6........1..7..2...88.....4.2## 22  ED=11.8/11.8/10.0
...4....9....8.2..6....3.1..36..1...7.........15....7.3....5.6..6.39.8....42.....## 23  ED=11.8/11.8/8.3 
1.....7.9..6...12........4.2.7.6.....3...8.7..8.5........8.4.5.....2.9.......5.34## 23  ED=11.8/11.8/2.6 
...4....9..6....2.7...3.5......48...8..5..3...15.73.....2.....65....48...9.....1.## 23  ED=11.8/11.8/11.5
1.....78...6.8...278.....5..1.9...7...4..2.......6.......5....7....24..3.9.8..5..## 23  ED=11.8/11.8/2.6 
.....6...4...89.....823.........7.56....2.9.....6.5.1.3.9...4...7...3..1.1......5## 23  ED=11.3/11.3/2.6 
1.....78..5......6......41..3.5.......69.3...9...74.......481....23.....8...9..7.## 23  ED=11.8/11.8/2.6 
1......89........3..8...56..7..4...66.91......4...2......5...9......43.2....23..7## 23  ED=11.8/11.8/2.6 
........94....92......7..45..1.3.....7.6..9..8....7..2.3.7..8....6.1....9....5.2.## 23  ED=11.8/11.8/10.5
......7..4......23..8...5.4.1..9....3.5..8....6.1..3.....97.6......1.97......2..5## 23  ED=11.8/11.8/2.6 
..3....894.....2...89.....1.3...1..57..52.....9...3......7..6.2........8....6.54.## 23  ED=11.8/11.8/2.6 
...4...89..7..92......3...526...1.....19.....7.....1..5...9..4...6..29.....8....3## 23  ED=11.8/11.8/10.7
......7.9...1...3..8...74...9....8.5..8..5..75.6....2...2.6......13.....94...8...## 23  ED=11.8/11.8/2.6 
1...56.....71......9....1.......3..87..5..9......2..4..7..45.2...2..8..36.....5..## 23  ED=11.8/11.8/11.3
.2....78.4.7.....6.9..7..1....5....3.....1.......9.12..7..1.8..5....4.....67.3...## 23  ED=11.8/11.8/2.6 
.2.....8..56.....17...3.5.......49....5.9....9..3.7...5...7.4.....8...52.1.....6.## 23  ED=11.8/11.8/11.3
1...5.7....7.....6.8...7.4....9..3...6...4..7..8....2.5..3.....8...9.1....2..8.7.## 23  ED=11.8/11.8/2.6 
....5...9..71.9.3.6..2.3...2..6...7..4....8......9...53.2....1.....2.....8...14..## 23  ED=11.8/11.8/2.6 
.23.5...9.571.....8....3.....97....5......8......654..3....4.6..1.5....2....1....## 23  ED=11.8/11.8/2.6 
.....6.8..5.1....3..9....4.2.......553..7......8...4......64...71.23...4...7....2## 23  ED=11.8/11.8/2.6 
..34.........8...668..7.1.....5....1.9..1.6.......2..4..5.....28.....96.97.....1.## 23  ED=11.8/11.8/2.6 
.2...6..9..6...1....8.3..4.2....7..8....4.5.....1...3...2..8..78..57....97.......## 23  ED=11.6/11.6/2.6 
..34......5..89...78...2...2....5..7...62.41....9....5.......6.8...9...2..1...3..## 23  ED=11.8/11.8/2.6 
.....6.8....1..2...9..7...5..5.4...734.7.8...97.........9...6..7...3...4...2...1.## 23  ED=11.8/11.8/11.3
.2...67..4...8......9.......3.....7.5.8...34..1.3....2....9..5....6.1..3...2..6.7## 23  ED=11.8/11.8/2.6 
...45.....5...9.3.6...2...52..8.......4.6...8.3...5.1.3..5...7......79...7......1## 23  ED=11.6/11.6/7.6 
....5..8....1.9..6...3..1.4.3...14..5......2...8.......9..1.....6.9..3..8.2.73...## 23  ED=11.8/11.8/7.6 
.23.5.7...56.....37....3...2...3...63...7...5.4.9.....5...2.6.7..2....1......8...## 24  ED=11.8/11.8/10.6
.2.4..7...57..9.3.6...7......5..8.9.7...2.....4.6..3.......1..85......1...1...9.3## 24  ED=11.8/11.8/11.2
..34.67..45..8............42...6..9...1..3..6...1.......46....7.8...5.4.9...4.2..## 24  ED=11.8/11.8/10.5
...4..78.....8.26......2..5.7.3..8..5.......2..9..1..7.65...47..4.6.....9.1......## 24  ED=11.8/11.8/2.6 
coloin
 
Posts: 2455
Joined: 05 May 2005
Location: Devon

Re: The hardest sudokus (new thread)

Postby Paquita » Mon Aug 19, 2024 2:31 pm

coloin, well yes

1.3.5...9.5.1....669.73...5.......43......8..7.......1.7.6......6139....9.5..1... is B10B
I am checking them now so maybe more.
Probably these are B10B too
1.3.5...9.5.1....669.73...5.......43......8..7.......1.7.6.5....6139....9....1...
1.3.5...9.5.1....669.73...5.......43......8..7.......137.6......6139......5..1...

See my B10B files in the BxB thread : are they not new either?

I wonder if you have a collection of unpublished puzzles that you checked against my puzzles?
I do check against T&E(2), the following :

ph2010
files posted by mith or hendrik before september 2023
files posted by me in the fall of 2023
hendriks new 11.8 file
your 11.9 study
the high BxB file collection - that one is a bit unclear what the latest updates are


tell me what I am missing?
Paquita
 
Posts: 130
Joined: 11 November 2018

Re: The hardest sudokus (new thread)

Postby Paquita » Mon Aug 19, 2024 2:41 pm

Yes this is the 11.8 part of min-expands from ph2010 plus the puzzles T&E(2) published before september 2023
One thing is that if one minimal of a min-expand is published, there may still be more (unpublished) minimals.
These are also interesting to use as seed. My just-pubblished list is of unpublished MINIMALs, not the corresponding MIN-EXPANDs


Code: Select all
1...567.9...1.926.6..27..51...91...5.1.5.792.....62.17.34............5...6.7..... ED=11.8/11.8/9.3
1.3.56....5718..3.68.7.3....618.53.73.5......87.3....15.6.........5..96.......4.. ED=11.8/11.8/3.4
1.3.56....5718....68.7.3....618.53.73.5......87.3....15.6.........5..96.......4.. ED=11.8/11.1/3.4
...4...8......92..6...7...5...8...9......24...3..1...7316......57.........2.6...3 ED=11.8/11.8/11.7
1....6.8....7..1........5.6..9.4.....7.2...3.8....76..3....1..5.4.9.......2.7.... ED=11.8/11.8/11.6
1.......9..67...2..8....4......75.3...5..2....6.3......9....8..6...4...1..25...6. ED=11.8/11.8/11.6
...4....9..6....2.7...3.5......48...8..5..3...15.73.....2.....65....48...9.....1. ED=11.8/11.8/11.5
.2...67..4...8......93........9..57..1...7..2......61.3...4..6...8.......6...5.2. ED=11.8/11.8/11.5
.2.4....9..7......6....2.5....91.....3...4..1...3..8....5....7..1..4...28.2...6.. ED=11.8/11.8/11.4
..345........89......23.5...1......7..4..28..9......6...2..84..6......9..7......1 ED=11.8/11.8/11.4
....567.....1.9...6...7......4.....13...6.9...8.....2.5....73....2.....8.1.....4. ED=11.8/11.8/11.2
...4....9....8.2..6....3.1..7...5.6....9..8......2...45.8......76...1....3.....7. ED=11.8/11.8/11.1
.2.....8....7...23......5.6..4.1.....6.3....29....5....7.8...6.5....4.....1.9.... ED=11.8/11.8/10.8
...4...89..7..92......3...526...1.....19.....7.....1..5...9..4...6..29.....8....3 ED=11.8/11.8/10.7
...4.6.....6..9.2.7...1.....1..3.4....96...5.8.......7.3......8..2..49.....5...4. ED=11.8/11.8/10.6
........94....92......7..45..1.3.....7.6..9..8....7..2.3.7..8....6.1....9....5.2. ED=11.8/11.8/10.5
1..4.......6.8...278...3....3..6...7..7..2...9......5....1..4..5......9..7...8..3 ED=11.8/11.8/10.5
.2.4.........89......23.6....5....9..3..4.2..7.......1..1....5..6.3..8..9.......7 ED=11.8/11.8/10.4
....56......1....6.8.3.7....6...3..75......2...4...9...1.7....8..2....4.9.....5.. ED=11.8/11.8/10.4
.2...6......1...3...9.7...5..8....57.3.....1.7...4.8....4.9.5...6.2.....9.......8 ED=11.8/11.8/10.0
...4...8...7..92......3...526...1.....19......7....1..5......4..1.8....3..6..29.. ED=11.8/11.8/9.9
.2.4..7....6.....17...3......5....6..4.2..9.......5..8..1..8....9..7.......92.3.. ED=11.8/11.8/9.8
.2.4....9..7.8.2..6.....1.........93.....5.2..9.2..4..5....7....1.3...4...8.6.... ED=11.8/11.8/9.4
...4....9....8.2..6....3.1..36..1...7.........15....7.3....5.6..6.39.8....42..... ED=11.8/11.8/8.3
1.......9.5....2....87...4.2...3......48.5....8.6...7...6..4.5.........1....9.3.. ED=11.8/11.8/7.9
1......89.....91.3.......6...7.4....3....1..5.6.2.....5....89...4..7......26..... ED=11.8/11.8/3.4
.....678........327.....5....1.4.....9.2.....6....7.5.3....58....29......4..1.... ED=11.8/11.8/3.4
.....6.....718........2...5..85....13.....9...6.....4...2.7...8.4.....6.9.....3.. ED=11.8/11.8/3.4
1....6....5...9.6.8..23.....9....54.3.......2.15...6..........7...37......1..4.5. ED=11.8/11.8/2.6
1.....78..5......6......41..3.5.......69.3...9...74.......481....23.....8...9..7. ED=11.8/11.8/2.6
1......8......92....6.3...52....8.....5.7.....6.5....4..47...........91..3..6...7 ED=11.8/11.8/2.6
..34...8.......1.37........2...9.......5..8...6...7.4...51....8.7...5...9...62.5. ED=11.8/11.8/2.6
......7.9...1...3..8...74...9....5.4.....5..75.6....2...1.6......23.....94...8... ED=11.8/11.8/2.6
..3.5.7..4....9...6..2.......5...8.3.9.....6.8..........8.1...75....4.2.....3.5.8 ED=11.8/11.8/2.6
.2...6..94.7....3..9.....5..6...85..3..........1.7.......9..8.2...8.2..5....1..4. ED=11.8/11.8/2.6
......7.9...1...3..8...74...9....8.5..8..5..75.6....2...2.6......13.....94...8... ED=11.8/11.8/2.6
..34......5..89...78...2...2....5..7...62.41....9....5.......6.8...9...2..1...3.. ED=11.8/11.8/2.6
...4..78.....8.26......2..5.7.3..8..5.......2..9..1..7.65...47..4.6.....9.1...... ED=11.8/11.8/2.6
..34.67..45..8............42...6..9...1..3..6...1.......46....7.8...5.4.9...4.2.. ED=11.8/11.8/10.5
.23.5.7...56.....37....3...2...3...63...7...5.4.9.....5...2.6.7..2....1......8... ED=11.8/11.8/10.6
....5.7.9.5.....2.7..2..6.52.5.7..9.68.92..5...15.8...........45...9..7....3..... ED=11.8/11.2/3.4
1...56.....71......9....1.......3..87..5..9......2..4..7..45.2...2..8..36.....5.. ED=11.8/11.8/11.3
.2....78.4.7.....6.9..7..1....5....3.....1.......9.12..7..1.8..5....4.....67.3... ED=11.8/11.8/2.6
.....6.8....1..2...9..7...5..5.4...734.7.8...97.........9...6..7...3...4...2...1. ED=11.8/11.8/11.3
.....6..94...8.2.....7...1.2.9...8....4.3.9...6.....5.3.8.4.....4.5......7...1... ED=11.8/11.8/3.4
1....6.......8.2...9.7....5.7.3...5.....716....4....73..59....48...2.....3....... ED=11.8/11.8/9.8
..3..6.8....1......9..7...4...8..6..3...4...2.....5.1...2.9...373.......94....5.. ED=11.8/11.8/3.4
.2.4..7...57..9.3.6...7......5..8.9.7...2.....4.6..3.......1..85......1...1...9.3 ED=11.8/11.8/11.2
..34.........8...668..7.1.....5....1.9..1.6.......2..4..5.....28.....96.97.....1. ED=11.8/11.8/2.6
.2.....8..56.....17...3.5.......49....5.9....9..3.7...5...7.4.....8...52.1.....6. ED=11.8/11.8/11.3
....5...9...7...3..8...1......3...7...8..24..6...9...5..2....548....42...14...... ED=11.8/11.8/9.7
.2...67..4...8......9.......3.....7.5.8...34..1.3....2....9..5....6.1..3...2..6.7 ED=11.8/11.8/2.6
1...5.7....7.....6.8...7.4....9..3...6...4..7..8....2.5..3.....8...9.1....2..8.7. ED=11.8/11.8/2.6
.2.4....9..7....3.6...7.1...4......87.....5....5.1..6.3...6..5......8..2...9..... ED=11.8/11.8/10.7
...4....9.....9.327...3.5..2......6...1.....8.3....25...41.8...6.........1.9.4... ED=11.8/11.8/2.6
....5..8....1.9..6...3..1.4.3...14..5......2...8.......9..1.....6.9..3..8.2.73... ED=11.8/11.8/7.6
.2.4.6.89...1..2.6.6...214.....61..4...9.8.12...24..6.57......8.......919..8.4... ED=11.8/11.1/3.4
..3.567.9..71.9.63...73.15..3.51.69.....93......6.73.........1..7..6....84....5.. ED=11.8/11.8/3.4
1.3...7.9.57..9.3669....51.....4.....3..21.........1.336.....51.7.5..96.9.5...3.7 ED=11.8/11.8/9.3
..3..6.894.7..........23..427..6..1.3.4.12.6..16..7...6..2.1...7.1.34.....267.... ED=11.8/11.1/3.4
..3..6.894.7..........23..427..6..1.3.4.12.6..16..7...6..2.1...7.1.34.....267...1 ED=11.8/10.9/3.4
..3..6.894.7..........23..427..6..1.3.4.12.6..16..7...6..2.1...7.1.34.....267...1 ED=11.8/10.9/3.4
..3....894.7..........23..427..6..1.3.4.12.6..16..7...6..2.1...7.1.34.....267...1 ED=11.8/11.0/3.4
1...567.9...1.926.6..27..51...91...5.1.5.792.....62.17.34....7.......5...6....... ED=11.8/11.8/9.3
....5678....78.1.3...1.3.65...3.8.515...1.8.68..56.37........17.7..3....9.2....3. ED=11.8/11.8/10.5
1.3.56....5718....68.3.75.........9..3....12.....31...37.81....8.5.63....6.7.5..8 ED=11.8/11.8/9.6
....5678....78.1.3...1.3.65...3.8.515...1.8.68..56.37........17.7.......9.2...... ED=11.8/11.0/10.5
....5678....78.1.3...1.3.65...3.8.515...1.8.68..56.37........17.7.......9.2....3. ED=11.8/10.6/10.4
12..56....571.9..66.927...127.69.....917.5.....6.12.9.......8.2...5...........3.5 ED=11.8/11.8/2.6
1.3..678..57....3686...71.5.......5...86........92....6.1...5.773....8...857...13 ED=11.8/11.8/9.6
12..56....571.9..66.927...127.69.....9.7.5.....6.12.9.......8.2...5...........3.5 ED=11.8/2.0/2.0
12..56....571.9..66.927...127..9.....917.5.....6.12.9.......8.2...5...........3.5 ED=11.8/8.4/2.6
1...5678....18..36...3.75.1...8.1.75.7..35.6...576.8..34....6.....6.3....9....... ED=11.8/11.8/6.6
1..4.678.4..18..36....371.4........7.1...8....95...4.....86..7.....1364..6.7.4..3 ED=11.8/11.8/6.6
12..56....5718.2..6.87.21..2.5.17....7.6.5.2...682.........8.1.7......93.6....... ED=11.8/11.8/6.6
.2345....45.7.9...7.9.32.....5...8.6374...........5.7.53...42...4259....9.72.3... ED=11.8/11.8/2.6
..3.........1.9.3....7..4.5..5.6..787.6...3.48...7.56.36.....575.46..8.3.8....64. ED=11.8/11.8/7.1
1..4.678.4..18..36....374.1........7.4...8....95...1.....86..7.....4361..6.7.1..3 ED=11.8/11.8/6.6
12.4.6...4.6.89....9821....2.4.6...1.89.21...61.8.4.......4.9...4.....57962...... ED=11.8/11.8/2.6
12..56....571.92..6.972.1..2.5.71....7.56...2..69.2.......9...17......38.6....... ED=11.8/11.8/6.6
12.4.6...4.6.89....9821....2.4.6...1.89.21...61.8.4.........9...4.....57962...... ED=11.8/11.1/2.6
..3.........1.9.3....7..4.5..5.7..687.6...3.48...6.57.36.....575.46..8.3.8....64. ED=11.8/11.8/7.1
.2345....45.7.9...7.9.32.........8.6374.............7.53...42...4259....9.72.3... ED=11.8/11.0/2.6
.2345....45.7.9...7.9.32.....5...8.6374.............7.53...42...4259....9.72.3... ED=11.8/11.1/2.6
..3.......5.1.9.3....7..4.5..5.6...87.6...3.48...7.56.36.....575.46..8.3.8....64. ED=11.8/7.1/7.1
...4.6.....7....36.......5.24.6.7...7.8.14..2.6182......274.1...14.68...87.2.1... ED=11.8/11.8/9.3
12.4.6...4.6.89....9821....2.4.6...1.89.21...61.8.4.........9.........57962...... ED=11.8/11.0/2.6
1..........6........8....4..1.59.3.7.7.3.1.94.3..4751.....759.....9.4.73...13.45. ED=11.8/10.2/2.6
1..........6........8....4..1.59.3.7.753.1.94.3..4751.....759.....9.4.73...13.45. ED=11.8/11.8/2.6
...4.....4...89..6......14523....46..65....13..4.6.5.23.6....5451....62..42...3.1 ED=11.8/11.8/2.6
...4..7..4.......2.......46.3.1.5....41.97...9.534....3.497..5159..14.7..175.3... ED=11.8/11.8/10.4
...4.....4...89.36......14523....46..65....13..4.6.5.23.6....5451....62..42...3.1 ED=11.8/11.8/2.6
............1.9.3....37.5.4.6......75.4...6.887..6.3..34.....657.56..8.3.865..47. ED=11.8/7.2/3.4
..........5.1.9......37.5.4.6......75.4...6.887..6.3..34.....657.56..8.3.865..47. ED=11.8/10.5/3.4
...4.....4...89.........14523....46..65....13..4.6.5.23.6....5451....62..42...3.1 ED=11.8/11.0/2.6
12..56....571.9...6.972....2.169.....95.17...76...2.9.572..............5......34. ED=11.8/10.4/2.6
...4.....4...89.3.......14523....46..65....13..4.6.5.23.6....5451....62..42...3.1 ED=11.8/11.0/2.6
12..56....571.9...6.972....2.169.....95.17...76...2.9.572..............5.1....34. ED=11.8/11.8/2.6
...4.....4...89.........51423....64...4.6..53.65...1.23.2...4.151....36..46....25 ED=11.8/11.0/2.6
...4.....4...89..6......51423....64...4.6..53.65...1.23.2...4.151....36..46....25 ED=11.8/11.8/2.6
...4.....4...89.3.......51423....64...4.6..53.65...1.23.2...4.151....36..46....25 ED=11.8/11.0/2.6
...4.....4...89.36......51423....64...4.6..53.65...1.23.2...4.151....36..46....25 ED=11.8/11.8/2.6
1..4.........8.......2......1..3..5636....87.5.7...1.36.13..5.883...5.67.75..831. ED=11.8/11.0/10.5
1..4.........8.......2......1..3..5636....87.5.7...1.36.13..5.883...5.67.756.831. ED=11.8/11.1/10.4
1..4.........8.......2......1..6..5336....87.5.7...1.66.13..5.883...5.67.756.831. ED=11.8/11.1/10.4
1..4.........8.......2......1..6..5336....87.5.7.3.1.66.13..5.883...5.67.756.831. ED=11.8/11.8/10.6
..3..6......1...3.9...7...42.....84..4..9...7..5....6........1..7..2...88.....4.2 ED=11.8/11.8/10.0
.2.....894......3...9.7.5......6.9..3.......2.8...2.4...16......7..1..9....5..1.. ED=11.8/11.8/2.6
.2......94...8.1....9.....6....483....16...97....1..6.3....1...5....4....72...... ED=11.8/11.8/2.6
.....6.8..5.1....3..9....4.2.......553..7......8...4......64...71.23...4...7....2 ED=11.8/11.8/2.6
......7..4......23..8...5.4.1..9....3.5..8....6.1..3.....97.6......1.97......2..5 ED=11.8/11.8/2.6
..3....894.....2...89.....1.3...1..57..52.....9...3......7..6.2........8....6.54. ED=11.8/11.8/2.6
1......89........3..8...56..7..4...66.91......4...2......5...9......43.2....23..7 ED=11.8/11.8/2.6
1.....7.9..6...12........4.2.7.6.....3...8.7..8.5........8.4.5.....2.9.......5.34 ED=11.8/11.8/2.6
.23.5...9.571.....8....3.....97....5......8......654..3....4.6..1.5....2....1.... ED=11.8/11.8/2.6
1.....78...6.8...278.....5..1.9...7...4..2.......6.......5....7....24..3.9.8..5.. ED=11.8/11.8/2.6
12..56..9.571.9..66.927...52.....3........8.........5..7259......16.7...96..12... ED=11.8/10.2/2.6
12..567.9.571.9..66.927...52.....3........8.........5..7259......16.7...96..12... ED=11.8/11.8/2.6
...45.7.9..71.92....9.72.51.1.5.79.474.29.51.9...41.723..........4......89.....2. ED=11.8/11.8/10.5
.234..7.94..............154...51.87.....479.5...9.8.41...87.49.....95.17.7...45.8 ED=11.8/11.8/2.6
..34.6.8.4.7.89...68.73.....68.4397.73.69.84.9.48.76..........8.......2..7.....5. ED=11.8/11.8/2.6
..34.678...718..638.6.371.4.8..143.6...76.81....3.8.4.5.......1.7.......9........ ED=11.8/11.8/2.6
..34.6...4.7.89...68.73..4..68.439..73.69.8.49.48.76.........9.........2.7......5 ED=11.8/11.8/2.6
..34.6...4.7.89...68.73.....68.439..73.69.8.49.48.76.........9.........2.7......5 ED=11.8/11.8/2.6
..34.678...718..638.6.371.4....143.6...76.81....3.8.4.5.......1.7.......9........ ED=11.8/11.8/2.6
..34.678...718..63..6.371.4....143.6...76.81....3.8.4.5.......1.7.......9........ ED=11.8/10.2/2.6
..34.6...4.7.89...68.73.....68.439..73.69.8..9.48.76.........9.........2.7......5 ED=11.8/10.2/2.6
..34.6.8.4.7.89...68.73.....68.439..73.69.84.9.48.76..........8.......2..7.....5. ED=11.8/10.4/2.6
.234....94..............154...51.87.....479.5...9.8.41...87.49.....95.17.7...45.8 ED=11.8/10.4/2.6
.23......4..............451...54.87.....179.5...9.8.14...87.19.....95.47.7...15.8 ED=11.8/10.2/2.6
.23.....94..............451...54.87.....179.5...9.8.14...87.19.....95.47.7...15.8 ED=11.8/11.8/2.6
...45.7.9..71.92....9.72.51.1.7.59.474.29.51.....41.723..........4......8......2. ED=11.8/11.7/10.6
...4..7..4.......2.......46.17.94.5.3.4....9159.1.3....3..15....419.7...9.534.... ED=11.8/11.8/2.6
...4..7..4.......2.......46.17.94.5.3.457..9159.1.3....3..1.....419.7...9.534.... ED=11.8/2.0/2.0
....5.......1.9.3....37.5.4.6......75.4...6.887....3..34.....657.6...8.3.8.6..47. ED=11.8/10.6/3.4
....5.......1.9......37.5.4.6......75.4...6.887..6.3..34.....657.6...8.3.8.6..47. ED=11.8/11.1/3.4
.23.....94....9.........451...54.87.....179.5...9.8.14...87.19.....95.47.7...15.8 ED=11.8/11.8/2.6
............1.9.3....37.5.4.6......75.4...6.887..6.3..34.....657.65..8.3.856..47. ED=11.8/7.2/3.4
1.3.567...5718..3.68.3.7................78.61...6..42.51..6...37.8.35....3...1... ED=11.8/7.2/3.4
1.3.567...5718..3.68.3.7................78.61.7....42.51..6...37.8.35....3...1... ED=11.8/10.6/3.4
..........5.1.9......37.5.4.6......75.4...6.887..6.3..34.....657.65..8.3.856..47. ED=11.8/10.5/3.4
1.3.56....5718..3.68.3.7................78.61.7....42.51.76...37.8.35....3.8.1... ED=11.8/10.6/8.8
..........5.1.9......37.5.4.6.....575.4...6.887..6.34.34.....657.6...8.3.856..47. ED=11.8/10.6/8.8
1.3.56....5718..3.68.3.7.................8.61.7.6..42.51.76...37.8.35....3.8.1... ED=11.8/11.0/10.3
..........5.1.9.3....37...4.6.....575.4...6.887..6.34.34.....657.6...8.3.856..47. ED=11.8/10.6/10.3
............1.9.3....37.5.4.6.....575.4...6.887..6.34.34.....657.6...8.3.856..47. ED=11.8/7.2/7.2
1.3.56....5718..3.68.3.7................78.61...6..42.51.76...37.8.35....3.8.1... ED=11.8/7.2/7.2
....5.....5.1.9.3....37.5.4.6.....575.4...6.887....34.34.....657.6...8.3.856..47. ED=11.8/10.5/9.4
....5.....5.1.9......37.5.4.6.....575.4...6.887..6.34.34.....657.6...8.3.856..47. ED=11.8/10.6/8.8
....5.......1.9.3....37.5.4.6.....575.4...6.887....34.34.....657.6...8.3.8.6..47. ED=11.8/10.6/9.4
....5.......1.9......37.5.4.6.....575.4...6.887..6.34.34.....657.6...8.3.8.6..47. ED=11.8/11.0/9.0
1.3.56.8..5718..3.68.3.7................78.61.7....42.51..6...37.8.35....3...1... ED=11.8/10.5/3.4
..........5.1.9......37.5.4.6......75.4...6.887..6.3..34.....657.6..48.3.856..47. ED=11.8/10.6/3.4
1.3.56.8..571...3.6..3.7................78.61...6..42.51..6...37.8.35....3...1... ED=11.8/7.2/2.6
............1.9.3....37.5.4.6......75.4...6.887..6.3..3......657.6..48.3.856...7. ED=11.8/7.2/2.6
..........5.1.9.3....37.5.4.6......75.4...6.887..6.3..3......657.6..48.3.856...7. ED=11.8/7.2/2.6
1.3.56.8..571...3.6..3.7................78.61.7.6..42.51..6...37.8.35....3...1... ED=11.8/7.2/2.6
..34.6.8.4.7.89...68.73.....68.4397.73.89.64.9.46.78..........8.......2..7.....5. ED=11.8/11.8/2.6
..34.6.8.4.7.89...68.73.....68.439..73.89.64.9.46.78..........8.......2..7.....5. ED=11.8/10.4/2.6
...4.678....18.2.6....72.14.19...6......21.....5..........68...7..2.48....271.46. ED=11.8/11.8/3.4
..34.6...4.7.89...68.73.....68.439..73.89.6..9.46.78.........9.........2.7......5 ED=11.8/10.2/2.6
..34.6...4.7.89...68.73.....68.439..73.89.6.49.46.78.........9.........2.7......5 ED=11.8/11.8/2.6
..34.6...4.7.89...68.73.....68.479..73.89.6.49.46.38.........9.........2.7......5 ED=11.8/11.8/2.6
..34.6...4.7.89...68.73..4..68.439..73.89.6.49.46.78.........9.........2.7......5 ED=11.8/11.8/2.6
..34.6...4.7.89...68.73.....68.479..73.89.6..9.46.38.........9.........2.7......5 ED=11.8/10.2/2.6
..34.6...4.7.89...68.73..4..68.479..73.89.6.49.46.38.........9.........2.7......5 ED=11.8/11.8/2.6
12..5..........2.66...3....2.....8.7.8.....24.7....16.76..24...8.4..16.2.12..847. ED=11.8/11.8/2.6
.2345...945...92.36.9......2..6.5.9...592....9.6.34.2.364.......9....1.8......... ED=11.8/11.8/2.6
...4.6...4...8923.9.832...4.8.6.49.3.....284..4.8...625.1.4................963... ED=11.8/11.8/2.6
.....6.8...6...1.2...2....4.3...75..5...9......85...1...28...4..7..3....9....5... ED=11.8/11.8/11.3
1......89....8.12.......5..2...9...8.7...4.....53.......4..7....3.5.....9...1..6. ED=11.8/11.8/10.8
....567.9.5.78..3.7..1.......5.4....3.8....4..4....2.....9..6........3.1.3..2..5. ED=11.8/11.8/10.0
...4....9....8...6.....215.2....7.1...9.4....71.......53.....7..7...3.....6...3.8 ED=11.8/11.8/2.6
..3....894.7..........23..427..6..1.3.4.12.6..16..7...6..2.1...7.1.34.....267.... ED=11.8/11.1/3.4
.2.4.6.89...1..2.6.6....14.....61..4...9.8.12...24..6.57.....28.......919..8.4... ED=11.8/10.5/3.4
.2.4.6.89...1..2.6.6...214.2...61..4...9.8.12...24..6.57......8.......919..8.4... ED=11.8/11.0/3.4
.2.4.6.89...1..2.6.6...214.....61..4...9.8.12...24..6.57.6....8.......919..8.4... ED=11.8/11.1/3.4
.2.4.6.89...1..2.6.6...214.2...61..4...9.8.12...24..6.57.6....8.......919..8.4... ED=11.8/10.9/3.4
.2.4.6.89...1..2.6.6....14.....61..4...9.8.12...24..6.57.6...28.......919..8.4... ED=11.8/10.4/3.4
.2.4.6.89...1..2.6.6...214.2...61..4...9.8.12...24..6.57.....28.......919..8.4... ED=11.8/11.0/3.4
1..4.........8.......2......3.....565.7...1.361....87.3.16.75.886...5.17.75..836. ED=11.8/11.8/2.6
.2.4.6.89...1..2.6.6...214.2...61..4...9.8.12...24..6.57.6...28.......919..8.4... ED=11.8/11.6/3.4
1..4.........8.......2......3.....565.7...1.361....87.3.1..75.886...5.17.75..836. ED=11.8/10.2/2.6
1.3....894.7..........23..427..6..1.3.4.12.6..16..7...6..2.1...7.1.34.....267...1 ED=11.8/11.0/3.4
1.3....894.7..........23..427..6..1.3.4.12.6..16..7...6..2.1...7.1.34.....267.... ED=11.8/11.1/3.4
1.3..6.894.7..........23..427..6..1.3.4.12.6..16..7...6..2.1...7.1.34.....267.... ED=11.8/11.2/3.4
1.3..6.894.7..........23..427..6..1.3.4.12.6..16..7...6..2.1...7.1.34.....267...1 ED=11.8/11.6/3.4
12....7.9.56...12.7.9....65...3.8.9........17.9..7.....1.5..6.256.2..97.9.2....51 ED=11.8/11.8/10.2
12....7.9.56...12.7.9....65...3.8.9........17....7.....1.5..6.256.2..97.9.2....51 ED=11.8/10.6/10.4
12....7.9.56...12.7.9....65...3.8..........17....7.....1.5..6.256.2..97.9.2....51 ED=11.8/10.6/10.5
......7.....1.9.36....3.4.52.6.......193.2...73.6......7..61.2..629.3.7...172.... ED=11.8/2.0/2.0
..3...7.....1.9.36....3.4.52.........193.2...73.6......7..61.2..629.3.7...172.... ED=11.8/9.1/3.4
....567..4..........932.....74..59.886.....759.....46..4.....97....9.8.4.98...65. ED=11.8/3.4/3.4
..3.........1.9.36...7..4.5..5.6..787.6...3.48...7.56.36.....575.46..8.3.8....64. ED=11.8/11.8/7.1
....567.94..........932.....74..59.886.....759.....46..4.....97....9.8.4.98...65. ED=11.8/3.4/3.4
...4.6.....7....36.......5.24...7.1.7.8.14..2.6182...4..274.1...14.68...87.....4. ED=11.8/7.1/7.1
..3.........1.9.36...7..4.5..5.7..687.6...3.48...6.57.36.....575.46..8.3.8....64. ED=11.8/11.8/7.1
..3.......5.1.9.3....7..4.5..5.7..687.6...3.48...6.57.36.....575.46..8.3.8....64. ED=11.8/11.8/7.1
...4.6.....7....36.......5.24...7.1.7.8.14..2.6182......274.1...14.68...87.....4. ED=11.8/7.1/7.1
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Re: The hardest sudokus (new thread)

Postby Paquita » Mon Aug 19, 2024 4:10 pm

Yes and these are also B10B, at least the first 3 - still calculating

1...567....718....68.3.75.........4.36....8.7........251..3....7.8.65....368.1..5
1...567...5.18....68.3.75.........4.36....8.7........251..3....7.8.65....368.1..5
....567....718....68.3.75.........4.361...8.7........251..3....7.8.65....368....5
....567...5.18....68.3.75.........4.361...8.7........251..3....7.8.65....368....5

when it is done I will post an update in het BxB thread
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Re: The hardest sudokus (new thread)

Postby m_b_metcalf » Mon Aug 19, 2024 7:24 pm

Note that two of your puzzles can be morphed into anti-diagonal symmetrical patterns. They would have been ideal for the ill-fated Patterns Game!

Code: Select all
 . . 8 5 . . . . 1
 3 . . . . . 9 . .
 . 6 . . . . . 4 .
 . . . . . 6 . . .
 . . 7 1 8 . . . .
 . . . . 2 . . . 5
 . . 2 . 7 . . . 8
 9 . . . . . 3 . .
 . 4 . . . . . 6 .

 . 2 . 4 . . . . 9
 6 . . . 7 . 1 . .
 . . 7 . . . . 3 .
 . . . 9 . . . . .
 3 . . . 6 . . 5 .
 . . . . . 8 . . 2
 7 . . . . . 5 . .
 . 4 . . . . . . 8
 . . 5 . 1 . . 6 .


Regards,

Mike
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Re: The hardest sudokus (new thread)

Postby m_b_metcalf » Tue Aug 20, 2024 12:10 pm

m_b_metcalf wrote:Note that two of your puzzles can be morphed into anti-diagonal symmetrical patterns. They would have been ideal for the ill-fated Patterns Game!

It turns out that first of these patterns did appear in the Patterns Game, #169.

Mike
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Re: The hardest sudokus (new thread)

Postby Paquita » Thu Aug 22, 2024 7:36 pm

Nice!

Sorry I don't have records of the Patterns Game puzzles.
More and more a proper database of what puzzles are known, is missed - at least by me.
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Re: The hardest sudokus (new thread)

Postby eleven » Fri Aug 23, 2024 8:39 pm

If a solver knows the tridagon pattern, the list contains trivial puzzles like this one
Code: Select all
..3..6.894.7..........23..427..6..1.3.4.12.6..16..7...6..2.1...7.1.34.....267....

and extremely hard ones like the two shown by Mike.
Same old story.

[Added:] Note: if the only givens of 2 digits are in the same box - and one is missing, check for a tridagon in the opposite boxes (those not in the same band/stack).
In the sample:
Code: Select all
+-------+-------+-------+
 | . . 3 | . . 6 | . 8 9 |
 | 4 . 7 | . . . | . . . |
 | . . . | . 2 3 | . . 4 |
 +-------+-------+-------+
 | 2 7 * | . 6 ° | . 1 . |
 | 3 * 4 | ° 1 2 | . 6 . |
 | * 1 6 | . x 7 | . . . |
 +-------+-------+-------+
 | 6 . ° | 2 * 1 | . . . |
 | 7 ° 1 | * 3 4 | . . . |
 | ° . 2 | 6 7 * | . . . |
 +-------+-------+-------+

5 not given, 8 and 9 are only given once in box 3. Now look at boxes 4578:
You immediately have 589 candidates in boxes 48, and also in the diagonal cells of box 7. In box 5 in r4c6 and r5c4 (all seeing 123467). These cells have (only) one rectangle (r58c24). So r6c5 cannot be 589 and must be 4.
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