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 » Sat Dec 11, 2010 6:45 am

Hi coloin and eleven,

May be some early comments on the search of hardest after I processed the last file from eleven.

i just finished the task and I have no time to dig in it before late afternoon. But I checked quickly and there are interesting puzzles

One remark to eleven, it would be better to have minimal puzzles. The first strange 2 animals I checked yesterday were in fact the same minimal puzzle (a double EXOCET).

Regarding the search process, from my experience in the pattern game, i would say that you should use a first set of hard puzzles and then make 3 to 4 cycle -+n on the same pattern.

I am trying that in the 22 area and I am for the time being selecting what i generated in a -1+2 process from the hardest 21 clues puzzles.
The first selection has a low filter. Next cycles will have more severe ones.

I'll just have time to go to the end for that step before I'll leave for 2.5 months, so I'll continue next spring.

I'll finish the process of eleven's file this afternoon has send back the results thru PM.

champagne
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Re: The hardest sudokus (new thread)

Postby eleven » Sat Dec 11, 2010 5:52 pm

Since i can generate 100K puzzles with ER 10+ a day i am less interested in tips, how to get more, but what to do with them.
I used filters, which reduce them to about 300 puzzles with an average ER of 10.6. The rating takes as long as the generation.

This let me think, that there are a big lot of extremely hard puzzles out there in regions, that have never been explored. But now my puzzle with highest q2 rating was already known. So it might be, that a good part of the really toughest puzzle (due to the public rating programs used here), already has been found.
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Re: The hardest sudokus (new thread)

Postby champagne » Sat Dec 11, 2010 6:17 pm

eleven wrote:Since i can generate 100K puzzles with ER 10+ a day i am less interested in tips, how to get more, but what to do with them.
I used filters, which reduce them to about 300 puzzles with an average ER of 10.6. The rating takes as long as the generation.

This let me think, that there are a big lot of extremely hard puzzles out there in regions, that have never been explored. But now my puzzle with highest q2 rating was already known. So it might be, that a good part of the really toughest puzzle (due to the public rating programs used here), already has been found.


You should reduce significantly the problem going to minimal puzzles.

In my database of hardest (not up to date), I have

77 000 puzzles with 21 clues
2 500 puzzles with 22 clues
and less than 400 puzzles with more than 22 clues.

On top of it, you have several puzzles having the same "minimal puzzle", so you would save rating time.

I am checking and preparing the result for your last file.

champagne
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Re: The hardest sudokus (new thread)

Postby eleven » Sat Dec 11, 2010 8:17 pm

Sorry, i should have done it for the puzzles i publish. For my search checking minimality of each puzzle is some waste of time.

This one is minimal (ER 11.9/11.9/9.9 with FIXED6 Explainer --batch - thanks to lksudoku, its about 20% faster for hard sudokus)
Code: Select all
 +-------+-------+-------+
 | 1 2 . | 3 . . | . . . |
 | 4 . . | . . . | 3 . . |
 | . . 3 | . 5 . | . . . |
 +-------+-------+-------+
 | . . 4 | 2 . . | 5 . . |
 | . . . | . 8 . | . . 9 |
 | . 6 . | . . 5 | . 7 . |
 +-------+-------+-------+
 | . . 1 | 5 . . | 2 . . |
 | . . . | . 9 . | . 6 . |
 | . . . | . . 7 | . . 8 |
 +-------+-------+-------+
         Kolk
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Re: The hardest sudokus (new thread)

Postby champagne » Sat Dec 11, 2010 8:51 pm

eleven wrote:Sorry, i should have done it for the puzzles i publish. For my search checking minimality of each puzzle is some waste of time.



May be this is true, reversely, out of some very special exceptions, the minimal form should be tougher to solve.

I find very interesting things in your last lot, requiring more analyze, unhappily, many of these nice puzzles are not minimal.

Looking for the "hardest version", I think it would be better, at least for these ones, to use the minimal version.

I also think using the minimal form finally pays toward rating several morphs of the same minimal.

I am hesitating on switching my selection of your file to minimal form (s) and to revisit the lot before coming back to you.

champagne
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Re: The hardest sudokus (new thread)

Postby ronk » Sat Dec 11, 2010 9:28 pm

champagne wrote:
eleven wrote:Sorry, i should have done it for the puzzles i publish. For my search checking minimality of each puzzle is some waste of time.

May be this is true, reversely, out of some very special exceptions, the minimal form should be tougher to solve.

I find very interesting things in your last lot, requiring more analyze, unhappily, many of these nice puzzles are not minimal.

Looking for the "hardest version", I think it would be better, at least for these ones, to use the minimal version.

I'm sitting here trying to convince myself that one of the requirements for puzzles in a "hardest puzzle list" should be minimality. So far I remain unconvinced.
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Re: The hardest sudokus (new thread)

Postby BryanL » Sat Dec 11, 2010 10:11 pm

eleven wrote:For my search checking minimality of each puzzle is some waste of time.


If I may chip in... Compared to the time it takes to rate, the check for minimality is almost zero. If you have a fast brute force valid solution checker of bit based form or even dlx, which will do tens of 1000's of puzzles a second, removing each given one by one and testing each will only take some microseconds...

Ron has raised a valid point though. A hard puzzle is a hard puzzle. Why should it be minimal?

Perhaps a smart move would be to list the minimal(s) - could there be more than one with a hard puzzle? - along with the puzzle in question.
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Re: The hardest sudokus (new thread)

Postby eleven » Sat Dec 11, 2010 10:12 pm

Only very special puzzles like Mauricio's example seem to have the possibility, that a non minimal form can be harder - and only for solvers, which have the appropriate uniqueness techniques implemented (for hard ones this probably only are symmetry techniques).
So i think, we can restrict the hardest lists to minimal ones and treat the few exceptions as very nice exotics, which earn an extra consideration.
btw i never understood, why in patterns game a puzzle is preferred, where the hardest step is at the beginning, but i dont mind.

I saw another puzzle with high q2 rating in my collection now (minimal 23 clue)
Code: Select all
99516 .2..5.7..4..1....68....3...2....8..3.4..2.5.....6...1...2.9.....9......57.4...9.. Cheese
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Re: The hardest sudokus (new thread)

Postby eleven » Sat Dec 11, 2010 10:18 pm

cross-posted :)
BryanL wrote:If I may chip in... Compared to the time it takes to rate, the check for minimality is almost zero. If you have a fast brute force valid solution checker of bit based form or even dlx, which will do tens of 1000's of puzzles a second, removing each given one by one and testing each will only take some microseconds...

You are right, a minimality check is fast. But in my search i cannot handle puzzles with a different number of clues. I will do the minimality check at the end (before rating, as you suggest).
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Re: The hardest sudokus (new thread)

Postby tarek » Sat Dec 11, 2010 10:46 pm

IMO, the non minimal version of a puzzle APPEARS more difficult than the minimal version due to the set of techniques we are using to solve puzzles.

The question will always be: How could the non minimal version be more difficult to solve when it is closer to the solution?

The "easier to solve" minimal version is contained within the "Harder to solve" non minimal puzzle! This highlights our lack of resources to find that easier path. We know that it should be easier but we can't prove it YET.

This is similar in a strange way to UR destroying puzzle information (which RW disproved) ... My feeling is that this situation is the same. I would stick with posting minimal puzzles as the most difficult version.

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Re: The hardest sudokus (new thread)

Postby ttt » Mon Dec 13, 2010 4:11 pm

eleven wrote:This one is minimal (ER 11.9/11.9/9.9 with FIXED6 Explainer --batch - thanks to lksudoku, its about 20% faster for hard sudokus)
Code: Select all
 +-------+-------+-------+
 | 1 2 . | 3 . . | . . . |
 | 4 . . | . . . | 3 . . |
 | . . 3 | . 5 . | . . . |
 +-------+-------+-------+
 | . . 4 | 2 . . | 5 . . |
 | . . . | . 8 . | . . 9 |
 | . 6 . | . . 5 | . 7 . |
 +-------+-------+-------+
 | . . 1 | 5 . . | 2 . . |
 | . . . | . 9 . | . 6 . |
 | . . . | . . 7 | . . 8 |
 +-------+-------+-------+
         Kolk

Congratulation...! Another ER11.9 - after GN.
I only did eliminate: r1c7<>4, r2c4<>1, r3c1<>8, r8c9<>7
Thanks for your puzzles and I'm still thinking more for this one... :D

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Re: The hardest sudokus (new thread)

Postby eleven » Tue Dec 14, 2010 12:04 pm

Thanks, ttt.

You might also be interested in this puzzle from my uploaded 5000. Though it only has ER 10.6 and q2 95511, Champagne commented it in a PM as
champagne wrote:The first one has a single EXOCET and seems to be the hardest I ever saw (to be investigated deeper).

Code: Select all
 +-------+-------+-------+
 | 1 2 . | 3 . . | 4 . . |
 | 5 . . | . 4 . | . . . |
 | . . 4 | . . 1 | . 3 . |
 +-------+-------+-------+
 | 6 7 . | 8 . . | . . . |
 | . . 3 | . 1 . | 2 . . |
 | . . . | . . . | . 6 . |
 +-------+-------+-------+
 | . . 5 | . 2 . | 3 . . |
 | . . . | . . 9 | . 7 . |
 | . 8 . | . . . | . . 9 |
 +-------+-------+-------+
          Straw
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Re: The hardest sudokus (new thread)

Postby eleven » Tue Dec 14, 2010 3:40 pm

For the record:
I found the time now to collect the ER hardest puzzles i found in the last month (after tareks last update), minimalize them and get the rating. Some of them already have been posted.
Code: Select all
11.9 11.9  9.9   .2.4...8.....8...68....71..2..5...9..95.......4..3.........1..7..28...4.....6.3..   Kolk
11.9  1.2  1.2   ..3..6.8....1..2......7...4..9..8.6..3..4...1.7.2.....3....5.....5...6..98.....5.   Imam bayildi
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.   
11.8 11.8 10.7   ...4...89..7..92......3...526...1.....19.....7.....1..5...9..4...6..29.....8....3   
11.8 11.8  9.9   ...4...8...7..92......3...526...1.....19......7....1..5......4..1.8....3..6..29..   
11.8 11.8  2.6   ..34...8.......1.37........2...9.......5..8...6...7.4...51....8.7...5...9...62.5.   
11.7 11.7 11.2   1...5...9..7...2...69..3.4....8........91..7.9....5..83..5....1..2...6...4.......   
11.7 11.7  2.6   ....56.8..5.7....3..8......2.....9...4.5....7....92.6.3.4.....15..1..4...1.....7.   
11.7 11.7  2.6   1...56.....71.......9....1..4..6.3.......8..29..7...6......24..5..6...9.....3...8   
11.7  1.2  1.2   ...4...8...7..92......3...526...1.....19.....7.....1..5......4...6..29..9..8....3   
11.7  1.2  1.2   .2.45....4....92....6.2............83...9.5...7...3.1.5..9..3...8......6..1....7.   
11.6 11.6 10.6   1....6....571......9..7..1...8...........89.29..5...6.....42..3.3....4..7..6...9.   
11.6  1.2  1.2   .2.4.....4...8...6..9..31..2..5...7..95.......7....3....29...4......1..3....6.8..
11.6  1.2  1.2   ..3..6.8.4..1..2...9......4.7...8....35......9...3...5..9.4...7.....2.1....8..6..

My first list can be found here.
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Check Point: Compiled puzzles for rating

Postby tarek » Sun Dec 19, 2010 8:16 pm

I am about to rate the puzzles submitted to this thread & then update the hardest sudokus database.

To organize it for future updates ... Each submitted puzzle from now on will automatically recieve a generic label with following form:
Code: Select all
HardestSudokusThread-00000

The latest database has 91 entries & the list of puzzles will undergo the process has 130 puzzles
Any puzzle without a personalized label will be listed in the database with the generic label.
The 1st 221 puzzles to date are not labelled to reflect the chronological order of submission to this thread. Labelling from HardestSudokusThread-222 will hopefully be in chronological order.

I skipped processing the following non minimal puzzles by eleven because I'm not sure if another minimal version was posted afterwards.
Code: Select all
....567.....1.9...6..37......4.....13...6.9...8.....2.5....73....2.....8.1.....4.
..3..6.8....1..2.66...7...5..4......3....4.9..98.2.....3...8.6.8.....1.7...5.....
12.3.....4...5......6..17....1..68..3...4..7....2...5..1....9....9....68.....9..7
.......8..5.1....6.....71...8.7...6...4.3....9....2..53...74..2.7.2..6......9...7
...4..........92..6...7...1.7..3....3..6..81...5.....35...1...8...2..19...1..84..
..34..7...5..8..32.......6.2..........19..3...6...8.51..8..4.......9.8..71......3
..34..7...5..8...2.......6.2..........19..3...6...8.51..8..4.......9.8..71.8....3
.2..5...94....9.3...91....4..8....7.......6..6....7..3.1..9...8..52.....9....43..
1....67......8..3....27...5...5....8..1..79......3..2.73.........27..6..91...4...
.2.4.....4....92...98.....4...6....75...1.....4...38..3......6....7....1..4..85..


The following puzzles were posted before & therefore will be listed in the database under the original poster

1.......2.3.4...5...6...7...4.6.3.......2.......5.8.9...7...1...8...9.3.2.......6 1...5...9..67......8...2.........8..3......15....9..475...4..3..7...8.....26..... HardestSudokusThread-00166 m_b_metcalf
1....9..5..6...7...8.....2.3..1.5.......8.......4.7..9.7.....8...2...6..5..3....4 1...5...9..67......8...2.........8..3......15....9..475...4..3..7...8.....26..... q1-taxonomy-2007-06-11-1317 rw-04-06

98.7.....7.....9....4.3.....1......2..84..7.......5.6...93..4......2..5......6..1 ..3....8..5...91..7.......6....4.9...4.29......5..1......6....3.1...24..8......7. GP-H1-3 champagne
.....8..5.4.....3...7.6.9.....9..1....91.6...2...7......2.1.7...3......85......4. ..3....8..5...91..7.......6....4.9...4.29......5..1......6....3.1...24..8......7. pearly6000-4974


.......2........49.2.9..7.......8...5...1.6...3.4....7..1..7...87..5.3...4.3..... ..3.5....4.........891...6..1.8...7...5.4....9....3......9....7......6.8..1.2..9. HardestSudokusThread-00204 coloin
........6..2....4..1...798....79.....8..5......3..8.1...6....2..9...51..4.......8 ..3.5....4.........891...6..1.8...7...5.4....9....3......9....7......6.8..1.2..9. tarx0010


Here is the ToBeProcesed list with any submitted SE ratings, the rest of the ratings will be based on the min-lex version of the puzzle

.......69...7...5...6.5.8....3.6...57....2....1.4.......5.8..9..2...1...4.....3..,coloin,col0906-4651,11.3,1.2,1.2
.....1.3........65..3.5.9....8.9...3.7...2...1..4.......6.8..5..2.7.....4.....8..,coloin,col0805-1192,11.2,1.2,1.2
.......83.7......5..5.3.9....9.5...8...2..6..1....4.....6.9..5.2..7......4...1...,coloin,colefg-ole006,11.2,1.2,1.2
.....1.3........65..3.5.9....8.9...6.7...2...1..4.......9.8..5..2.7.....4.....8..,coloin,col0805-698,11,1.2,1.2
1.....5...8.4...6...3..7....4..8........94.8....6....2..7...1...6.9...2.5.......3,coloin,col0805-1410,10.9,10.9,3.4
.....1.3........65..6.5.9....8.3...6.7...2...1..4.......9.8..5..2.7.....4.....8..,coloin,col0805-1156,10.8,1.2,1.2
..3...5...8.4...6.1.......3....94.2..9...8......2....67.....1...6.9...8...5.7....,coloin,coly-863,10.7,1.2,1.2
.....1.3........85..3.5.9....8.9...31....2....7.4.......5.8..9..2....6..4..7.....,coloin,col0805-382,10.6,10.6,9.2
.9.4..7....8....3........24.3.2...7.....5.9..1....6...5...1.....4.7....2..6..8...,coloin,colBF3-1061,10.6,1.2,1.2
...7...3........86..3.9.5....5.6...8.1...2...7..4.......6.3..5.4....1....2....9..,coloin,cola2-1017,10.6,1.2,1.2
..3...5...8.4...6.1.......7....94.2..9...8......2....67.....1...4.9...8...5.3....,coloin,cola2-1731,10.6,1.2,1.2
...5...3........69..8.6.7....9.8...35....2....1.4.......6.3..7..2...1...4.....8..,coloin,cola2-3412,10.6,1.2,1.2
.3......9.......65..5.9.8....8.5...6.....21..7..4.......9.8..5.4....7....2.3.....,coloin,colBF1-2263,10.6,1.2,1.2
..3...5...8.4...6.1...7.....9...4.......98.4....2....67.....1...6.9...8...5.....3,coloin,col0906-23308,10.6,1.2,1.2
.....1.3........89..3.5.2....8.9...31....2....7.4.......5.8..9..2....6..4..7.....,coloin,col0805-592,10.5,10.5,9.2
98.7.....7.....8....4.3.....1......2..84..9.......5.6...79..3......2..5......6..1,chmpagne,GP-H1-2,10.9,10.9,10.6
98.7.....7.....9....4.3.....1......2..84..7.......5.6...93..4......2..5......6..1,chmpagne,GP-H1-3,10.6,10.6,9.5
98.7.....7.....8....4.3.....1......2..73..4.......5.6...84..7......2..1......6..5,chmpagne,GP-H1-4,11.2,11.2,3.4
98.7.....7.....8....4.3.....1......5..94..3.......2.6...83..7......6..2......5..1,chmpagne,GP-H1-6,11.1,1.2,1.2
12.3.....3.....2....4.5.....6......7..24..1.......8.9...35..4......7..8......9..6,m_b_metcalf,HardestSudokusThread-00111,10.6,10.6,3.4
5.......9.2.1...7...8...3...4...2.......5.......7.6.1...3...8...6...4.2.9.......5,StrmCkr,HardestSudokusThread-00112,11.6,11.6,3.4
........1.6...9.3...2.3.7..4..8.5........6....3.9...8...1.....4.5...8.9.7.....2..,coloin,cola199,10.6,1.2,1.2
.......3....2....5..5.6...9..3.9...8.7...2...1..4..6....8....5.2....78...4.1.....,coloin,colBF2-1991,10.6,10.6,9.7
5......8...3....69..6.8...3..8.7...61..2..7.......4.....7.9....2..1......4...5...,coloin,colBF2-63,10.8,10.7,9.6
..3.5.......4...9.1.....7.5.8..46......9.8.6...2......5.....3...2.6...8...7.....1,coloin,colBF2-7,11.2,11.2,7.8
1.......5.......39..5.3.8....9.5..8.7....2....1.4.........8..5..2...7...4..1..6..,coloin,colBF2-326,10.9,10.9,10.1
.....1..3.......9...6.9.8....8.....97....26...1.4..5....3.8..5..2.1.....4....7...,coloin,colefg-182,11.3,11.3,3.4
3...5.7.1.9.4...6...1.7.....8.24........9..2.......8.6..........6.9...8...5.....3,coloin,colBF3-10021,9.9,9.9,2.8
........9.....2.6...6.9...5..5.6...87....4....1.2.......3....9..2...73..4..1..8..,coloin,colBF2-4314,10.7,10.7,9.9
.......63...1....9..6.9..5...8.....6.7...2...1..4.......5.8..3.4....18...2...7...,coloin,colz2-957,10.5,1.2,1.2
.......391......6...6.9...5..8.6...3.7.4.28...1...........8..5..2...1...4..7.....,coloin,coly-245,10.6,10.6,2.6
1..45...94...89......1........8....5.6.....2...7..23...3.....7...2..46..9.......1,coloin,col0701-65,10.7,10,9.2
.......8..2.....69..9.8........7...6.1.2..7..5....43....6.9..3.2..1......4...5...,coloin,col0906-1657,10.8,10.8,9.9
........3.7.....69..6.9...5..9.6...8.1.4.....7....2.......8..9..2...78..4..1.....,coloin,col0906-2323,10.8,10.8,3.4
.......63.....7..9..3.9...5..5....9..1...2...7..4..8....6.3...8.2...1...4..7.....,coloin,col0906-1190,10.9,1.2,1.2
.......63...1....9..6.9..5...8.....6.7...2...1..4..8....5.8..3..4...1...2..7.....,coloin,col0906-2666,10.6,1.2,1.2
.......39.7.....6...6.9...5..5.8...37..4..8..1....2.......6..9..2...1...4..7.....,coloin,col0906-1503,11.2,11.2,9.5
..1...5.....8...6.3...5...7.9..8.......49..2.2.....6..7.......1.6.9...4...5...3..,coloin,col0906-4450,10.9,1.2,1.2
..3.....5...4...9.1...5.7...8..46......9.8.6.2........5.......3.9.8...2...7...1..,coloin,col0906-2105,10.7,10.6,9
...4............39..3.9...5..9.8...6.7.2.....1....4.....8....5.2....78...4.1..6..,coloin,col0906-461,11.3,1.2,1.2
..3.1...5.2.4.....1.....7.....2.8.4..8..46...........95.......1.4.6...9...7...3..,coloin,col0906-2257,11.2,10.8,9.5
..3.....5.6.8...9.1.....7...9..48......9.6.4...2......5.....3.....6...2...7.3...1,coloin,col0906-1276,11.2,11.2,10.6
1.......5.2.4...8...3...7...4.86........49.6.........2..7..51...6.9.....5.......3,coloin,col0805-857,10.7,10.7,10
..1...5...8.4...2.3.......7.4.9.6.......42.9.........8..7.3.1.....6...8.5.......3,coloin,col0906-1171,11.2,1.2,1.2
..1...5...2.4...8.3.......7.6.92........4..9...8.....6.....51...8.6.....5.7.....3,coloin,col0906-3754,10.7,1.2,1.2
..1...5...8.4...2.3.......7.4.96........42.9.8.............51...2.6.....5.7.....3,coloin,col0906-2693,11.1,11.1,3.4
..3.1...5.9.4.....1.....7...4.8.6.......42.8.........95.......1.2.6...9...7...3..,coloin,col0906-2002,10.6,1.2,1.2
..3.1...5.2.4.....1.....7...4.8.6.......49.6...2........7...1...8.9...2.5.......3,coloin,col0805-1622,11.1,1.2,1.2
.......392.......5..3.9..8.....5...8.7...2...1..4.......6.8..5..2.7..6..4....1...,coloin,col0805-730,10.9,1.2,1.2
1.....5...2.4...6...3.......4.8.9.......46.8.......2....7.....1.8.9...2.5...7.3..,coloin,col0805-856,10.5,10.5,9.5
..3...7...2.4...6.1...5.3......82....8.9.4...6........7.....1...6.8...9...5.....3,coloin,col0906-1146,11.1,1.2,1.2
.......63...7....9..6.9..5...8.....6.7...2...1..4.......3.8..9..2...18..4....7...,coloin,col0906-2459,10.5,1.2,1.2
.......6....7...59..6.9......8.....5.1...23..7..4.......5.8..3.42...18.......7...,coloin,col0906-3425,10.5,1.2,1.2
..1...5...2.8...6.3.......7.4..8........96.2.2.....4..7...3...1...9...4...5...3..,coloin,col0906-3526,11.1,1.2,1.2
.......63.....1..9..3.9...5..5....9..1...2...7..4..8....6.3...8.2...7...4..1.....,coloin,col0906-1073,11,1.2,1.2
...7...69.......5...6.9......8.....5.7...23..1..4.......5.8..3..2...18..4....7...,coloin,col0906-961,10.6,1.2,1.2
.....4.65........3..3.6...9..9.3...8.1...2...7..4.......8....5.2....78...4.1.....,coloin,col0906-284,10.8,1.2,1.2
.....2..5.......63..3.6...9..6.5...8.1.2.....7..4.......8....5.2....78...4.1.....,coloin,col0906-583,11.2,11,2.6
...2...8.........5..6.5......8.3...9.7...23..1....4.....9....3..2.7..9..4....16..,coloin,col0906-3789,10.6,10.6,2.8
.......8.1..2....5..6.5......8.3...9.7...23.....4.......9....3..2.7..9..4....16..,coloin,col0906-4548,10.6,10.6,9.2
...7...6........59..6.9......8.....5.7...23..1..4.......5.8..3..2...18..4....7...,coloin,col0906-1078,10.7,1.2,1.2
..3.1...5...4.8...1.....7...4...2.......46.8.8.......95.......1.2.6...9...7...3..,coloin,col0906-7186,10.6,10.6,9.2
..1...5.....8...6.3...5...7.9...8......49..2.2.....6..7.......1.6.9...4...5...3..,coloin,col0906-5742,11.1,1.2,1.2
...7...6.........5..3.6...9..9.....8.1...2...7..4.......8.3..5.2....78...4.1..3..,coloin,col0906-388,10.8,1.2,1.2
........3.7.....69..9.3...5..3.6...8.1.4.....7....2.......8..9..2...78..4..1.....,coloin,col0906-3939,10.7,1.2,1.2
.4.....39........5..3.5..8.....6...8.7...2...1..4.......6.9..5..2.7.16..4........,coloin,col0805-774,10.6,10.6,2.6
.....7.3.........5..3.5..8...8.....6.7...2...1..4..9....6.8..9..2.1..6..4..7.....,coloin,col0805-28,10.9,1.2,1.2
.......6....7...59..6.9......8.....57....23...1.4.......5.8..3.42...18.......7...,coloin,col0906-1675,10.5,1.2,1.2
....5...9..6...1...8.1...4.2....5....9..1..3....2.7.....1...8...4...1.6.9...2...7,tarek,tarx0104,11,1.2,1.2
....5...9..6...1...8.1...4.2....5....9..1..3....2.7.....1...8...4.....6.9...2..17,tarek,tarx0105,11,1.2,1.2
.....2..13...5..4....7..6..5.......2.9..4..3...6...7....21.....4...8.....8...3.9.,coloin,ONY,11.4,11.4,3.4
..39.....4...2.....8...16.......89......3..5..7.6....1..5.....3.9.7..8..2......4.,dml,dml-1,11.3,11.3,3.4
3....67.4.7...1.2...5...8.....6.2...............719.6...8...5...1.2...7.4.......3,tarek,tk-1789,10.7,10.7,10.5
1.......2.3.4...5...6...7...8.2.3.......7.......5.8.4...7...6...5...9.8.2.......1,m_b_metcalf,HardestSudokusThread-00165,10.4,10.4,10.4
1.......2.3.4...5...6...7...4.6.3.......2.......5.8.9...7...1...8...9.3.2.......6,m_b_metcalf,HardestSudokusThread-00166,10.5,10.5,10.4
1.......2.3.4...5...6...7...4.8.3.......1.......5.6.9...7...6...8...9.3.2.......1,m_b_metcalf,HardestSudokusThread-00167,10.6,10.6,10.4
1.......2.3.4...5...6...7...4.6.3.......2.......5.8.9...7...6...8...9.3.2.......1,m_b_metcalf,HardestSudokusThread-00168,10.7,10.7,10.4
9.......5.7...4.1...3...8.....2.7.4.....3.....1.6.......8...3...6.1...7.5.......9,champagne,HardestSudokusThread-00169,10.8,10.8,3.4
1.......2.3...4.5...6...7.....8.3.4.....6.....5.9.......7...6...8.5...3.2.......1,m_b_metcalf,HardestSudokusThread-00170,10.7,10.7,3.4
..53.....8......2..7..1.5..4....53...1..7...6..32...8..6.5....9..4....3......97..,AI,HardestSudokusThread-00171,10.6,10.6,1.2
1.......2.3...4.5...2...6.....6.2.4.....7.....5.8.......6...4...8.3...7.2.......1,Mauricio,HardestSudokusThread-00172,,,
1.......2.3...4.5...2...6.....6.7.8.....3.....9.2.......6...9...4.9...3.7.......1,Mauricio,HardestSudokusThread-00173,,,
2..5...38......2.1.....356...4..91...7..8....9..3....2..9..4....8..7....5..9....6,champgne,HardestSudokusThread-00174,10.7,10.6,9.9
3..2...14......2.5.....136...4..25...7..8....9..3....2..9..4....8..7....5..9....6,champgne,HardestSudokusThread-00175,10.6,10.6,9.9
1..5...34......2.1.....356...4..91...7..8....9..7....5..2..4....8..7....3..9....6,champgne,HardestSudokusThread-00176,10.6,10.6,10.6
8..9...14......9.8.....167...7..68...3..2....5..4....1..2..3....4..1....6..5....9,champgne,HardestSudokusThread-00177,10.6,10.6,9.4
1..2...39......6.1.....325...4..71...8..9....7..6....2..3..5....9..4....8..7....6,champgne,HardestSudokusThread-00178,10.6,10.6,9.4
6..5...24......5.8.....469...7..68...3..2....1..4....9..1..7....2..3....9..8....6,champgne,HardestSudokusThread-00179,10.6,10.6,9.5
1.......9.4...2.8...6...3.....4.3.7.....6.....2.5.8.....9...1...8.7...4.5.......6,gsf,HardestSudokusThread-00180,11.3,11.3,3.4
..9...4...7.3...2.8...6...71..8....6....1..7.....56...3....5..1.4.....9...2...7..,eleven,HardestSudokusThread-00181,11.8,11.8,11.6
....567.....1.....6..37......4.....13...6.9...8.....2.5....73....2.....8.1.....4.,eleven,HardestSudokusThread-00182,11.7,11.7,11.2
1...5...9.......3..79........7.1...65....42..6..8.......5.6...7.....2.4....3..8..,eleven,HardestSudokusThread-00183,11.7,1.2,1.2
1.......7.2.4...6...3...5...4.2.9.......46.9....5.......7...1...8.9...2.5.......3,eleven,HardestSudokusThread-00184,11.5,11.5,11.2
.2...67......8.1.2...2..4.6..85......1...2..79...3....3..........59......4...16..,eleven,HardestSudokusThread-00185,11.5,11.5,10.6
..3..6...4.....2...9..7..1....59........1...8.6...7.5..1.7...9...2.....38.....4..,eleven,HardestSudokusThread-00186,11.5,1.2,1.2
.2..5.7..4....92..........5.......74.9.6.....8.4..19..3...1.4...4...3.28..8...3..,eleven,HardestSudokusThread-00187,11.1,11.1,9.8
9.....8.....7...6.....8.5.4.3.8.....4...2.9....1..6.3...41......6...7...5...4...2,champagne,swampy_soil,10.8,10.8,10
.....1..2.1..3..4...56.......27..8...8...4.3.1...9.......3..5...9..8..1.6.......7,Mauricio,HardestSudokusThread-00189,11.3,11.3,10.5
12.3.....4...5......6..17..5..2......3..1..4...1..68....9....7....1..9.......9.68,eleven,First_Peak,11.8,11.8,10.7
12.3.....3...4......5..23..5....61.........9...67....8.5...16.....9...4.....8...7,eleven,HardestSudokusThread-00191,11.7,11.7,10.7
9.....8.....7...6.....5.4.9.3.2.....8...4.3....6..7.1...26......1...3...3...8...5,champagne,HardestSudokusThread-00192,10.7,10.7,9.3
9.....8.....7...6.....8.5.4.3.2.....1...5.9....4..3.5...23......7...6...8...4...1,champagne,HardestSudokusThread-00193,9.8,9.8,9.4
9.....8.....7...6.....8.5.4.3.4.....5...2.4....6..3.1...73......1...5...8...4...9,champagne,HardestSudokusThread-00194,10.7,10.7,9.5
9.....8.....7...6.....5.4.3.6.2.....8...3.9....7..4.1...23......1...5...4...8...5,champagne,HardestSudokusThread-00195,10.5,10.5,8.8
9.....8.....7...6.....5.4.3.2.1.....3...4.9....4..6.1...72......6...3...4...8...5,champagne,HardestSudokusThread-00196,10.6,10.6,3.4
9.....8.....7...6.....5.4.3.4.2.....5...4.1....6..1.4...78......2...6...4...3...9,champagne,HardestSudokusThread-00197,10,10,9.5
..34..7.......9..6....2..1...8.43.715..8......4....8..........28...6..9...57..1..,eleven,HardestSudokusThread-00198,,,
.2....7.9..71...3.6...7....2....4....9.5....8..6.9.3.......8..4..2.3.9..9......5.,eleven,HardestSudokusThread-00199,,,
1....67.9...........9.7..4...1.6.4...3.....2.8....5.1...6.2...45....3....1.8...6.,eleven,HardestSudokusThread-00200,,,
1...56.8...71......96...1...7..3.........2..46..5..8......4...27..8..5.......5.3.,eleven,HardestSudokusThread-00201,,,
.....1..2..3....4..5..6.7.....8...7...7..38..9...5...1..6.8.2...4.6....72....9.6.,Mauricio,HardestSudokusThread-00202,,,
.....1..2..3.4..5..6.7..8....1....3..4..9.1..7..1....6..5.7.....8.6...9.2....3..4,Mauricio,HardestSudokusThread-00203,,,
.......2........49.2.9..7.......8...5...1.6...3.4....7..1..7...87..5.3...4.3.....,coloin,HardestSudokusThread-00204,,,
..3.......5.4...8.1.......7.9..8........94.6.5.62.............3.6.9...4...7.2.1..,coloin,HardestSudokusThread-00205,,,
...2....871......9..6.9.5....8.6...5.....23...4....6....9.3..5.4....1........7...,coloin,HardestSudokusThread-00206,,,
3....9.4..2..7.6....1.....5..63......5..2....4....19..7....6..1..8.5.3.....4...2.,coloin,HardestSudokusThread-00207,9.2,9.1,9
12.3.....4.....3....3.5......42..5......8...9.6...5.7...15..2......9..6......7..8,eleven,Kolk,11.9,11.9,9.9
.2..5.7..4..1....68....3...2....8..3.4..2.5.....6...1...2.9.....9......57.4...9..,eleven,Cheese,,,
12.3..4..5...4......4..1.3.67.8.......3.1.2.........6...5.2.3.......9.7..8......9,eleven,Straw,10.6,,
..3..6.8....1..2......7...4..9..8.6..3..4...1.7.2.....3....5.....5...6..98.....5.,eleven,Imam_bayildi,11.9,1.2,1.2
1.......9..67...2..8....4......75.3...5..2....6.3......9....8..6...4...1..25...6.,eleven,HardestSudokusThread-00212,11.8,11.8,11.6
...4...8...7..92......3...526...1.....19......7....1..5......4..1.8....3..6..29..,eleven,HardestSudokusThread-00213,11.8,11.8,9.9
..34...8.......1.37........2...9.......5..8...6...7.4...51....8.7...5...9...62.5.,eleven,HardestSudokusThread-00214,11.8,11.8,2.6
1...5...9..7...2...69..3.4....8........91..7.9....5..83..5....1..2...6...4.......,eleven,HardestSudokusThread-00215,11.7,11.7,11.2
....56.8..5.7....3..8......2.....9...4.5....7....92.6.3.4.....15..1..4...1.....7.,eleven,HardestSudokusThread-00216,11.7,11.7,2.6
1...56.....71.......9....1..4..6.3.......8..29..7...6......24..5..6...9.....3...8,eleven,HardestSudokusThread-00217,11.7,11.7,2.6
...4...8...7..92......3...526...1.....19.....7.....1..5......4...6..29..9..8....3,eleven,HardestSudokusThread-00218,11.7,1.2,1.2
1....6....571......9..7..1...8...........89.29..5...6.....42..3.3....4..7..6...9.,eleven,HardestSudokusThread-00219,11.6,11.6,10.6
.2.4.....4...8...6..9..31..2..5...7..95.......7....3....29...4......1..3....6.8..,eleven,HardestSudokusThread-00220,11.6,1.2,1.2
..3..6.8.4..1..2...9......4.7...8....35......9...3...5..9.4...7.....2.1....8..6..,eleven,HardestSudokusThread-00221,11.6,1.2,1.2


This is the 1st compilation & there is a chance that there is mistake here or there. Any comments are appreciated.


tarek

[EDIT: I also cross referenced the list with my personal collection & dicovered 17 duplicates, from those I already published 4, two of which are in the list already ... The other 2 will be added to a puzzle mentioned above making it 3 puzzles that will undergo a change of poster if they make the database]
User avatar
tarek
 
Posts: 2612
Joined: 05 January 2006

Re: The hardest sudokus (new thread)

Postby eleven » Tue Dec 21, 2010 3:51 pm

Hi tarek,

today i found another ER 11.9, but it turned out to be Golden Nugget :D
(i also refound 12 other puzzles from champagne's ER list with 488 puzzles from my random starting set)

Those ones should be new:
Code: Select all
11.8  1.2  1.2   .2.4..7...5...9.3.6...7......5..8.9.7...2.....4.6..3.......1..85......1...1...9.3
11.7 11.7  2.6   ...4....9....8.2..6....3.1..1...7...7..6..5...3.....7.3....5.2...29..8......2...4
11.7  1.2  1.2   1....67...5.7....3..8.....4.4.5..3......2..9........45.7.9...3.6...1......2..8...
11.6 11.6 10.7   1.3.....9..71.9....9.....4..1...7..3....2.8.....5...6.....6.5..6..8...2..7...4...
11.6 11.6  9.5   ..3..67...5..8.....9.1.........9..1...7..32..8..5...4.37....4.......4..6..4....72
eleven
 
Posts: 1536
Joined: 10 February 2008

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