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Searching a collection of hard sudokus

 
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Javus

Joined: 09 Oct 2011
Posts: 2
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Location: Germany

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PostPosted: Sun Oct 09, 2011 4:00 pm    Post subject: Searching a collection of hard sudokus Reply with quote

I am searching for a collection of "hard" but not hardest sudokus. "Hard" is a rating of my daily newspaper. They should be solvable by humans. I tried "minimum sudoku" from Gordon Royle, but these are too differing. And I tried "top10000" from Ruud, but these are too hard.
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daj95376

Joined: 05 Feb 2006
Posts: 431
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PostPosted: Sun Oct 09, 2011 11:05 pm    Post subject: Re: Searching a collection of hard sudokus Reply with quote

Javus wrote:
I am searching for a collection of "hard" but not hardest sudokus. "Hard" is a rating of my daily newspaper. They should be solvable by humans. I tried "minimum sudoku" from Gordon Royle, but these are too differing. And I tried "top10000" from Ruud, but these are too hard.

There are many puzzles marked "Advanced" at this web site in the forum group "Puzzles by daj". Although I'm not posting puzzles there anymore, there are numerous puzzles logged that may suit your needs.
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Javus

Joined: 09 Oct 2011
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Location: Germany

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PostPosted: Mon Oct 10, 2011 11:46 am    Post subject: Reply with quote

Thank you daj95376 for answering. But I am not searching for single intersting sudokus but for a collection of hard sudokus. I want to read it by program.
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daj95376

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PostPosted: Mon Oct 10, 2011 4:54 pm    Post subject: Reply with quote

Javus wrote:
Thank you daj95376 for answering. But I am not searching for single intersting sudokus but for a collection of hard sudokus. I want to read it by program.

You could have at least tried some of the puzzles posted in that forum to see if they fall into what you consider to be "hard".

Hard is a subjective term when it comes to Sudoku puzzles. There's "newspaper hard" at one end of the spectrum, and then there's "forum hard" for experienced manual solvers that solve puzzles posted in various forums or generated by various solver/generator programs.

Here's a group of puzzles that probably cover the spectrum of "hard".

Code:
.....12.9.4....61...9.....7.....976.....7...11..2..89.97.1.4.5..8.9.51..5.1.6...4
.....2498.4...95.....8....6..59.1..7.....5...41.726...62....9.51......8.5.86..1..
.....34...3...6.91..41.9..3..53.8.49....1...51495..8..4....19...2.4...17.9163..8.
.....7.86.8.6...74....48.23.4.9.......3.6....5.9..4..........4.918...65.764.....1
....1.625.7..5......68.......29.1..678..2.5.4...5.49.21...68...8......6.6..295..8
....317.4.1...4.....7.56.31......5.37.9.1.4.6534......1..54.2.9..3......4.569.3..
....73....62491.85.4..2831..9.25....67381.52.251........6.4..5..27.8.43..8......7
....9.....2...4.....4.7..13...7.6.292.9.537...6.12..4.....4.13...32.549...29....7
....97834.8...3.69..4...5.....2..4..4........61...9..88.69..1..97.....8.14...2..6
...1..4...1....295.....61.75..26.7.4...81......1..7..22765..3...5........937.4...
...9......9.2..1....8...39681.52.463...84.........12.8.623.87.4..34....9..16.283.
...95413..1.........93.1..54.513..973..74....1.7..2.4.9.....5..6..4.7.....12....4
..1.....2.4.15...35....2....2.976....8.51.2.7..74...5.....9.1.......1.6491..8..2.
..162..8...5......43251..6.2.47..85.6.7.5.........1......4..3..3.91...28.......17
..2........6938427789.2.56..6.8..2...75.6.8...2...5..6.9758.6...58....4..3...6..5
..2..98.3...364..13...2.695.8........26.8.5.753...69.82.5.98.....8....5.163.52..9
..2.4.9.8.6....57.9.8..5.46...5..6..5......97..7..1...24.7..8...75.9..2.3.1.5...9
..4..2.....97...4.35.....6..1....68......3.7.6...913.....1.453..7593.12.........7
..4.35.1..3....8..5.786.4....678....7.359..6.9....3.7..75....9.8...5672.........5
..4.86.....795..6398..7...2.6..4..1.14972..868...............3..3.86.14..91.3....
..49..18..........2.783..9.9.35...2...5.4.7.......7..13...5..7.7.81..2.......3..8
..5.......4..9532.6.3.........9......7..82593.9..748...5..296.8.3..6..4.....4.9.5
..6...3...2.4....59..3614.2.95.3.64...495......2......8.15..2.....1......49.....3
..7...138......96.8.1.....2...8..2......1..89.....231.35.4.8.9171..958.39.8.3.527
..8.62.97.9....6.13...1.2.....1....88.7.9.1..9....6..3.13.2.8.96........58.6.13..
..876.3....1.38..7734..9.623..6....884..9.7.6.76......6...7.984..9...6...8794.2.3
..96......7.....2.8.12.59647.48...5.....67.4...3.51.87..7...49..425967....8..4..5
..98......6....1..5.4.1.9..2...794.6..62...7....6.42...219.8..3....6..2....4..5.9
.12..5...6..9.8.133.....5...2.....8.....24...84..97.26..6.......5.4.9.32.9...3.65
.2.7...5.76.........93..4..6.28573.....9..6.2...2.4.....364.1..1......6.....3....
.395.62..26.......7.4..8..68..9.3..5....5...89.58.7.236.....5.......9.72..7285.6.
.4....7.887.1.......97.8..4.873.24.........17..64..8..6..8.794.....4.6.54.8.5..72
.4..5....5723.19...81.27.3..9..7...67.42......68..9..4.5....7....7....4....7.5..2
.4.5.38.12.......3....1..5.9..85......463.5.95....1.374...8.9....9..5..886..49.75
.5.4.9.6.74.3...9...2768..39152..4....7.9....3.4..1......9..73.53....92...9.....5
.6.......8.596..7..93.4..61.4...9.1..51.3..46...1.49.......61...2479..5...6.1...4
.79.....683.1..9744....7..3.6.73.......24..6...4..9..7.4........9..5..31351..2.9.
.86..5...95.1.8..21.49..85..687.........8...541...3.68..9....8...1..452..4..91...
.9....83.7.6....42.82.45.........3....7.34.....9.87..49..4..1..57.....9..2...9..5
.94873..56..4.....3.7.2....53.6..78.2.9.5.3..4...........23.8.....9.....9.......2
1....6937........1...1.9..6..7...6.5....6..436.3..7.197..2.....8...93.74394785.6.
1...7.....73.1..52.4..9...8...547...4371....5...9.2174.....8..1.2...1.8..81.294..
18.3.....23.8.416...7.1...876.5...3...3.87..6.2..3...1.4....7.2.9.7...8...2.486..
19......234..57.81..5..1......1.2....5..8.1...145.372.....46..5.6...5.1757....64.
2...19....175..9.4.93.87.25.2.1.5.8.7.8.2...99.17.8.4..8.........68.1.9..72.5...8
27..8965.398...4...5...4......9.....7...3...58.5..7.4.41....9..5....1.7.....4...8
3...4.8......3...6..785.34...81..9..951.2.768........31.359.68...9.1.5...8..63..1
3..2..7...4.3...95.........47.5.2.6.....134.....74..2.7...2..1..3.4.1957.1.....46
3.2.6..5..9...2...6.487.29...56...2.9.6....3..2...34....7..63.22.973..86......57.
3.76.2.9..1.....6.6.4.8...74..........1.278..9...41.7.....7.6.974...6.81..6...74.
37....1..14...786...8..2..9...29.......8.3....93.7.68.93...15...1...5.97..4....1.
4....7....7..5.9....6.9.........14...64..95..5..4281.9.4.9853.6.......1......68..
4....8....839.264..2.4......6214.......69.4..94...31...9..2487..7....256.......9.
4...82.65.6817..2..2..5347..9.5.....317.4.6..6.2........5.6.7..746....3.1........
4..2......51.....3.9.5.321.9.37...56....39.....4.25.39..5...3....23.8.4..6.4.2..1
4..2.5....2.7.6..4..5.4....59.8.......6.1.4..84...79.2....58..........48.5...9.67
47.9...5.92.7..8.1..5......26...19.5....6.......5.96.2.5.8.2.937.....1...8.1.75..
5.....1...19.6.4...2.1.......5..63.4.8..2.6.....5.38.289.6325.1.......6....7.82.3
5..1.3..2.97.5..4..132.....9.56....1.8..259..3...14.......9..1..3....7..1..5....9
5..3..1.6..3615....71......31.9..2...9..7.3...6...3...7..52..19......8751.....62.
5..4....9.693....4.24......74.2.6.93....53......94..8.......7.5...1.4.6.47.5..9.8
5..9..3.2..9.......26..8.794....9..3....4..57..78.5...9......35..3.9.78.7.853.2.1
5.17.98.3.8....2..7.6....5.8..5...32....4.5..9....74..25..78.....89...2.1..4....8
56.38....78..1......9..784.1..67..2.42.19..7...7..41....2..17....172..5..........
6..4......52.9.....97....4.1..63..2..8.2.9.16....78.9.......9....5983..1....1..82
6.27.34....5.28..747...5...3...8...2.6.237...298.4.7.38....12.........7..2.3.4..8
61.......78.9216....9.8.12..6.71.23..3724.....4...3....218..37...61..8..........2
614.7..3.8...6.7.47.9.4..6....82....1976.42.5....15....7..8.4.93.5....2..4..5.3..
645.719..7.95.46..18.69..5..129..86.8.4.1....37...51..43.1.9.....87...1..........
7......2..3...9.....9.21.3.....3.94...41623.7.73.842.....2471..1.78.........1....
7.....5...2............5.19....8.6.....572..8..7.462912..8.1..6..9..7.....6.938.7
7...83..4...7.......6.....3.6.53..425..6741.94...19.......4.9.....9...3.1.736....
7..9....3.8...7..6..4...5.74..1.9..5....4..8..3.8.5.....3...459....9.7.15974..26.
71....2963.5.9.74..92...5.....2..3...2..5.91......9.5215692.4..23..65.7.9....1...
72...4...14.6.39.2..3.2..5..7.4.9.....1.8....95.3.18...8...2.....9....2..1......8
73....9..8..23..74..4.......8.34...9.2.5..........86.22....3.98.9....46..4.8.92.7
78...4...1..89574...5...1...1.52.....5.76.32.62....9.5.41.582.7.7..4..8......74..
8...5.163.3..8.92...5.....8...13..9.49.86.............38.......64.3...815.9....37
8..4......4..83.6....51689.3.68......58.3...6.21..9385..4..823..82..465.....52...
9.........2.8..4.7....9.352.1.7...24..7.5.6.3.......7..98.7......24.3..9.3128..46
9.....2...2.85......346..95.892..3.1.46.938......81...3..97......4........86....4
9.....71..4..872....712...6..42..5...79.514...1..43...85.71.96.7.....1....1......
9....4.81.8.1...9...2..9....4.7.8.5.....9...47.94.6..8......84.47.8..53.8...43..2
9...741.6..6.......836...2...54.....3...8...18....6.531.....8.9..8..9.676...4851.
9..4.7..1..1.3.4...74.5183.5..3......17...3..3.8..21...35.289.4..2....7.8.....2..
91.7..4..7.54.8.9..48.2....82.3.594...6...85..9.8.....2..58.6...5.97..8.........4
93.....1.268..1.9..17.9........34.....182.43..7.1.9.......1.37918..7.24.......1.8
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