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 champagne » Wed Oct 14, 2020 5:48 am

Having received a significant contribution from mith, I prepared a new update of the data base

as for all new files , that update is in my "google drive space" with the name ph_2010.zip

the link to that storage place is here

The file contains now 3 103 972 puzzles ( 3 049 068 in the former release dated October 2019)

On interesting fact is the arrival of new very high SE ratings (11.8 and 11.7 ...) already posted in this thread

The readme file included in the zip file have more details.
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Re: The hardest sudokus (new thread)

Postby mith » Fri Oct 16, 2020 4:23 am

New 11.8 tonight:

Code: Select all
........1.......2...3..45......6...7..5..8....9.3..4...39..58...8.9.....2...1..7.  ED=11.8/1.2/1.2
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Re: The hardest sudokus (new thread)

Postby denis_berthier » Fri Oct 16, 2020 5:11 am

If the "database" is a real database, it shouldn't be too difficult to -issue a diff at the same time, so that we don't have to search for what's really new.
I asked the previous time, to no avail.
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Re: The hardest sudokus (new thread)

Postby champagne » Fri Oct 16, 2020 6:09 am

denis_berthier wrote:If the "database" is a real database, it shouldn't be too difficult to -issue a diff at the same time, so that we don't have to search for what's really new.
I asked the previous time, to no avail.

Anybody working in this field can do it easily with its own storage, but if this can help the new entries are at the bottom of the file o2_index.
Here, all new puzzles of very high rating have been posted in this thread (or in the pattern game)
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Re: The hardest sudokus (new thread)

Postby denis_berthier » Fri Oct 16, 2020 3:41 pm

champagne wrote:
denis_berthier wrote:If the "database" is a real database, it shouldn't be too difficult to -issue a diff at the same time, so that we don't have to search for what's really new.
I asked the previous time, to no avail.

Anybody working in this field can do it easily with its own storage, but if this can help the new entries are at the bottom of the file o2_index.
Here, all new puzzles of very high rating have been posted in this thread (or in the pattern game)


Not everybody wants to read the 49 pages of this thread plus the 3054 of the patterns game. And not everybody wants to use 19th century methods for finding the proper information by having to combine two files.
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Re: The hardest sudokus (new thread)

Postby denis_berthier » Fri Oct 16, 2020 3:41 pm

mith wrote:New 11.8 tonight:

Code: Select all
........1.......2...3..45......6...7..5..8....9.3..4...39..58...8.9.....2...1..7.  ED=11.8/1.2/1.2


I tested it: it's in B5B (or lower).
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Re: The hardest sudokus (new thread)

Postby champagne » Fri Oct 16, 2020 7:37 pm

denis_berthier wrote:
champagne wrote:
denis_berthier wrote:If the "database" is a real database, it shouldn't be too difficult to -issue a diff at the same time, so that we don't have to search for what's really new.
I asked the previous time, to no avail.

Anybody working in this field can do it easily with its own storage, but if this can help the new entries are at the bottom of the file o2_index.
Here, all new puzzles of very high rating have been posted in this thread (or in the pattern game)


Not everybody wants to read the 49 pages of this thread plus the 3054 of the patterns game. And not everybody wants to use 19th century methods for finding the proper information by having to combine two files.

and each user has it's own spec of the "diff" needed. 58 thousand new puzzles does not help that much)
I did my best to keep this data base.
I am now an old man (78)
it's time for anybody willing to replace me to take over the job
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Re: The hardest sudokus (new thread)

Postby mith » Fri Oct 16, 2020 7:49 pm

Since I'm the one adding most of the puzzles at the moment, I don't mind putting up my own version of the database at some point.
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Re: The hardest sudokus (new thread)

Postby denis_berthier » Sat Oct 17, 2020 12:15 am

champagne wrote:
denis_berthier wrote:Not everybody wants to read the 49 pages of this thread plus the 3054 of the patterns game. And not everybody wants to use 19th century methods for finding the proper information by having to combine two files.

and each user has it's own spec of the "diff" needed. 58 thousand new puzzles does not help that much)
I did my best to keep this data base.
I am now an old man (78)
it's time for anybody willing to replace me to take over the job


Your work of collecting all the findings has been useful. I just meant the presentation could be improved. And I don't think the diff would be that large: only the upper part of the collection is really useful.
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Re: The hardest sudokus (new thread)

Postby denis_berthier » Sat Oct 17, 2020 12:18 am

mith wrote:Since I'm the one adding most of the puzzles at the moment, I don't mind putting up my own version of the database at some point.

In the meantime, could you put your own collection of the SER ≥ 11.7 ?

And I have another question: are you using the same type of proximity search as described e.g. by eleven?
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Re: The hardest sudokus (new thread)

Postby mith » Sat Oct 17, 2020 4:09 am

The ones added in champagne's update are here:

https://drive.google.com/drive/folders/ ... sp=sharing

Each file is ordered by ER/EP/ED, so they're at the top. But here are the 11.7s and 11.8s from those files (I think the only new one since is the 11.8 I just posted).

Code: Select all
........1.....2.3...4.5.6.7...2.8....7..6...59.........16...4...5..1.7..8..3.....;11.7;11.7;2.6
........1....23.....45...6......1....5.7...8.9...5...3.6.8..7...75....4.2.......9;11.7;1.2;1.2
.....9.......8..76...7...85..5.....7.9.....5.1....23...1...4...34..9......681....;11.8;11.8;2.6
..12..3......4..5......6...2.....1.3.4.....6.1.7.....8.1.7......9..65...7..8..2..;11.8;1.5;1.5
........1..2..3.4..4..5.6.......7.8...43......1..9.5...9......63.78.....4....2.7.;11.7;11.7;10.7
........1.....2.3...4.5.6.....2...7..7...4..28...9.5....5..69...1.3.....6.8.4....;11.7;11.7;9.4
........1.....2.34..3.5.6.....6..7...7..8....9....1.4..8.5.....3.1....9.4....3..2;11.7;11.7;8.0
........1.....1..2...34..5...36......574.....8....2....46....7..7.5...6.9...6.1..;11.7;11.7;2.6
.....1..2....3..4....5..1.6..1..72...8......59......8...6..5...43..9....89.3.....;11.7;11.7;2.6
.....1..2....3..4....5..1.6..1..76...8......59......8...5..2...34..9....89.3.....;11.7;11.7;2.6
........1.....2.....3.4.56....7.......4.......5..3.42..26.....8.35..9...4...2.35.;11.7;1.2;1.2
........1....23.4.....452....1.....6.3...6.2.6.7...8....8.5.....5...4...1..6....9;11.7;1.2;1.2
................12..3.145.........4...16......5..371...35....8..749.....1...534..;11.7;1.2;1.2
........1..2..3..4.5..6.27.....8.52.5..9.6...8.......6..76..4...6.....1.2...7.8..;11.7;1.2;1.2


In broad strokes, nothing novel compared to eleven's description. It's still a proximity search, mostly using {-1+2}, {-2+2}, or {-2+1). At the moment I'm only searching 21-24 clues; the 19 and 20 clue searches hadn't yielded anything new in a while. I've got a thread constantly churning through SER ratings, but the generating is filtering on q2 and skfr mostly.
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Re: The hardest sudokus (new thread)

Postby champagne » Sat Oct 17, 2020 7:49 am

mith wrote:The ones added in champagne's update are here: ...


and if you select items with an internal number >3000000 you get yours plus the 2 from sssx
Code: Select all
.....9.......8..76...7...85..5.....7.9.....5.1....23...1...4...34..9......681....   11.8   11.8   2.6   MITH   2020_10   3269469   22   
..12..3......4..5......6...2.....1.3.4.....6.1.7.....8.1.7......9..65...7..8..2..   11.8   1.5   1.5   MITH   2020_10   3268347   22   
........1..2..3.4..4..5.6.......7.8...43......1..9.5...9......63.78.....4....2.7.   11.7   11.7   10.7   MITH   2020_10   3265491   22   
........1.....2.3...4.5.6.....2...7..7...4..28...9.5....5..69...1.3.....6.8.4....   11.7   11.7   9.4   MITH   2020_10   3266306   22   
........1.....2.34..3.5.6.....6..7...7..8....9....1.4..8.5.....3.1....9.4....3..2   11.7   11.7   8   MITH   2020_10   3266003   22   
........1.....2.3...4.5.6.7...2.8....7..6...59.........16...4...5..1.7..8..3.....   11.7   11.7   2.6   MITH   2020_10   3276414   21   
........1.....1..2...34..5...36......574.....8....2....46....7..7.5...6.9...6.1..   11.7   11.7   2.6   MITH   2020_10   3270807   22   
.....1..2....3..4....5..1.6..1..76...8......59......8...5..2...34..9....89.3.....   11.7   11.7   2.6   MITH   2020_10   3269484   22   
12.3.....34..1......5..6...2.....5...1.....2...7..8..9...5..6.7....3..4......79..   11.7   11.7   2.6   SSX   2020_02_29   3261240   22   
.....1..2....3..4....5..1.6..1..72...8......59......8...6..5...43..9....89.3.....   11.7   11.7   2.6   MITH   2020_10   3269482   22   
........1.....2.....3.4.56....7.......4.......5..3.42..26.....8.35..9...4...2.35.   11.7   1.2   1.2   MITH   2020_10   3301956   22   
........1..2..3..4.5..6.27.....8.52.5..9.6...8.......6..76..4...6.....1.2...7.8..   11.7   1.2   1.2   MITH   2020_10   3273143   24   
........1....23.4.....452....1.....6.3...6.2.6.7...8....8.5.....5...4...1..6....9   11.7   1.2   1.2   MITH   2020_10   3302991   22   
................12..3.145.........4...16......5..371...35....8..749.....1...534..   11.7   1.2   1.2   MITH   2020_10   3301994   23   
12.3.....6...7..1...4..5...3.....4...6..2..3...8.....9...9....8.7..3..6......25..   11.7   1.2   1.2   SSX   2019_10   3260101   22   
........1....23.....45...6......1....5.7...8.9...5...3.6.8..7...75....4.2.......9   11.7   1.2   1.2   MITH   2020_10   3267992   21   
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Re: The hardest sudokus (new thread)

Postby denis_berthier » Sat Oct 17, 2020 9:55 am

Mith + Champagne

Thanks for the list
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Re: The hardest sudokus (new thread)

Postby mith » Tue Nov 24, 2020 5:41 pm

I forgot to post my morph of the 11.8 21C I found (keeping with the theme of fitting 11.8 on a diagonal...)

Code: Select all
+-------+-------+-------+
| . . . | . . . | . . 9 |
| . . . | . . . | . 8 . |
| . 7 . | . 6 . | 5 . . |
+-------+-------+-------+
| . . . | 4 . . | . 3 . |
| . 5 . | . 2 . | . . . |
| 1 . . | . . 7 | 6 . . |
+-------+-------+-------+
| 7 1 . | . 5 . | 2 . . |
| 2 . . | . . 1 | . . . |
| . . 9 | 8 . . | . . 3 |
+-------+-------+-------+
........9.......8..7..6.5.....4...3..5..2....1....76..71..5.2..2....1.....98....3  ED=11.8/1.2/1.2


Otherwise, since the database update I also have a new 11.7 (22C), ten eleven 11.6s, and just over 10k new 11+. I'll get a full update up sometime in December maybe.

Code: Select all
........1.......2...3..45......6...7..5..8....9.3..4...39..58...8.9.....2...1..7.  ED=11.8/ 1.2/ 1.2
........1....23......4.5.3...16..7...3...4...8.6.....9..97..8...2..4..5.6........  ED=11.6/11.6/ 9.8
........1.....2..3..4.5..6..1....7..4.6.8....5..9...4..2...3...6.5......8...6..9.  ED=11.6/11.6/ 2.6

........1.....2.3...4.5.6....7.6.8...6.....9238.........857.....5.8..4..1....9...  ED=11.7/11.7/10.5
........1.....2.3.....1.4.5..2..3....4..6.7..6..8...9...89......6..5...771....5..  ED=11.6/11.6/ 7.8
........1.....2.3...4.5.6.......7..2..8....1..9..8.5...467......89..3...5...6.4..  ED=11.6/11.6/ 3.4 (+MFC)

........1.......2...1.345...1..462..3..7.....4...1..8..5......2.6.9.....1...653..  ED=11.6/11.6/ 2.6
........1.....1.23...24.5....26.7....8..5....9...8......7..6.3.4.3....168.....9..  ED=11.6/11.6/ 2.6
........1.....2.....3.4..5.....6.5....54.7....6.3...7...6.7.84.8.......99.4.3..6.  ED=11.6/ 1.2/ 1.2

........1.....2.....3.4..56...4.......4...5.7.6..7.3....685..7.8....96..9.5.6..3.  ED=11.6/ 1.2/ 1.2
..............1..2..3.4.56........27..6..5....8..3.65.....5.48..38.69....54.....6  ED=11.6/ 1.2/ 1.2 (+MFC)
..............1..2..3.4.56........27..6..5....8..3.6......5.48..38.69..5.54.....6  ED=11.6/ 1.2/ 1.2 (+MFC)
........1.....2.3...4.516.....1.......1.754..89.2.......25....6.4...7.5..7...62..  ED=11.6/ 1.2/ 1.2 (+MFC)


*I assume these are all new, I haven't actually gotten around to updating my database to champagne's latest.
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Re: The hardest sudokus (new thread)

Postby mith » Fri Nov 27, 2020 9:48 pm

This one may also be of interest, for the high q1:

Code: Select all
........1....23.....45...6...57...4...62.8.7..9......8..7..2...46.....2.5..6..7..  ED=11.2/1.2/1.2 q1=99431 q2=99489


Also worth noting this pair of 22Cs in the October update:

Code: Select all
........1.....2.3...4.5.6....6....1..4.7....38...9.4....85......6..8..949.5......  ED=11.6/1.2/1.2 q1=99225 q2=99130
........1.....2.3...4.5.6....6....1..4.7....38...9.4....8..9....6..8.5.49.5......  ED=11.6/1.2/1.2 q1=99225 q2=99130


I believe these are the 4th and 5th puzzles to hit ER>=11.6, q1>=99000, AND q2>=99100. (Easter Monster and a couple by eleven are the others.)
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