Collection of sudokus

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

Re: Collection of sudokus

Postby eleven » Tue Nov 22, 2011 2:16 pm

lerxst wrote:If that's of any help, the "hardest" ones for my database query are puzzles with empty rows and/or empty columns. So if you have a puzzle with a few empty rows AND a few empty columns, that would be terrific. To be precise, columns and rows with less that 2 clues force the optimizer to do a partial match in the index...
...
Do you guys have such puzzles in your databases ?!? I'd be interested by those if you have some!

Here are some from this thread
Code: Select all
..........256..4.......438..942..1.............3..189..627.......1..897..........
..........352..6.......784..946..5.............3..418..627.......1..897..........
..........251..4.......738..142..5.............3..589..627.......1..897..........
..........952..4.......738..249..5.............3..186..627.......1..897..........
..........952..4.......738..549..2.............3..186..627.......1..897..........
..........954..7.......234..749..1.............3..582..627.......1..897..........
............6.514....4.732..51...46...........83...21..675.8....127.6............
..........219..7.......485..172..9.............3..864..457.......9..513..........

and the one by Rico Alan (in wikipedia Mathematics_of_Sudoku):
Code: Select all
14.93....93.1.......................56......489.....27............25..18...74..32
eleven
 
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Re: Collection of sudokus

Postby m_b_metcalf » Wed Nov 23, 2011 1:28 am

m_b_metcalf wrote:Out of curiosity, I just dug out my old program, described above, and ran it on a 17-clue puzzle, something I never did before abandoning it. It took 5 minutes!

Intruiged, I introduced 'modern' reordering and reduced the time to just seconds. The others posted here all solve in a fraction of a second.

Regards,

Mike Metcalf

EDIT: I timed the first 100 puzzles in the TOP50000; that took 1000s @ 2GHz.
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Re: Collection of sudokus

Postby lerxst » Mon Nov 28, 2011 8:17 pm

eleven wrote:
lerxst wrote:You probably missed my previous post in this thread but as I was explaining, in my specific case, 17-givens are usually the hardest to solve because they don't have enough clues to help the plan optimizer much...

Now you made me curious. This would be the first solving algorithm i am aware of, which handles hard puzzles easier than singles puzzles. So would you try these 10 ones please and compare it with 10 17 clues ?
Code: Select all
98.7.....7.....6....6.5.....4...5.3...79..5......2...1..85..9......1...4.....3.2.
98.7.....6.....87...7.....5.4..3.5....65...9......2..1..86...5.....1.3.......4..2
12..3....4....1.2...52..1..5..4..2......6..7......3..8.5....9....9.7..3......8..6
.......39.....1..5..3.5.8....8.9...6.7...2...1..4.......9.8..5..2....6..4..7.....
.2.4...8.....8...68....71..2..5...9..95.......4..3.........1..7..28...4.....6.3..
12.3.....4.5...6...7.....2.6..1..3....453.........8..9...45.1.........8......2..7
..3..6.8....1..2......7...4..9..8.6..3..4...1.7.2.....3....5.....5...6..98.....5.
1.......9..67...2..8....4......75.3...5..2....6.3......9....8..6...4...1..25...6.
1....6.8....7..1........5.6..9.4.....7.2...3.8....76..3....1..5.4.9.......2.7....
.2...67..4...8......93........9..57..1...7..2......61.3...4..6...8.......6...5.2.


As an example, basic search timings (without the last optimizations)
98.7.....7.....6....6.5.....4...5.3...79..5......2...1..85..9......1...4.....3.2. : 14.41s
98.7.....6.....87...7.....5.4..3.5....65...9......2..1..86...5.....1.3.......4..2 : 9.08s
12..3....4....1.2...52..1..5..4..2......6..7......3..8.5....9....9.7..3......8..6 : 26.97s

However, note that those timings should be smaller than that as I am still heavily updating my database server right now...
Back to you soon for more results...


Since my computer is till "crunching" number and making heavy updates in my database, those numbers should normally be smaller than that!
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Looking for 19 givens

Postby lerxst » Tue Jan 03, 2012 7:59 pm

Hello everyone,

Anyone could help me and give me 20-25 19-givens sudoku? I have collected enough 17 to 32 givens grids but, curiously, I ended up having only 3 grids with 19 givens. They seem to be pretty rare!

tia!
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Re: Looking for 19 givens

Postby champagne » Tue Jan 03, 2012 11:14 pm

lerxst wrote:Hello everyone,

Anyone could help me and give me 20-25 19-givens sudoku? I have collected enough 17 to 32 givens grids but, curiously, I ended up having only 3 grids with 19 givens. They seem to be pretty rare!

tia!



I had a look on my data base of puzzles imported

I have 4 18 clues puzzles.

This does not mean that they are "rare".

They have no searched quality

- minimum number of clues (17)

- hardest puzzles (seems to be 20 to 24 clues).

It would be easy to generate many of them starting from the 20 clues seeds

here the puzzles in my data base

champagne

100050000000200030004000600090003000600070005000100070001000200030009000000060001 ravel Nick70 #848 of all 19's with this pattern
000020580040300000010000000000600071800000200007400000200059000000000306700000000 taxonomy gsf-m3-2007-09-30
070020580040300000010000000000600071800000200000400000200059000000000306700000000 taxonomy gsf-m3-2007-09-30
020000000000600003074080000000003002080040010600500000000010780500009000000000040 t95 74


PS first one seems to be number 848 of a specific data base
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Re: Looking for 19 givens

Postby ronk » Tue Jan 03, 2012 11:53 pm

lerxst wrote:Anyone could help me and give me 20-25 19-givens sudoku?

Below are 216 constructed from a collection of 18-clue symmetric puzzles, so these 19-clue puzzles are not randomly generated. All are minimal, symmetric, and non-isomorphic.

Hidden Text: Show
Code: Select all
5......1......9.23..4.5.......6...5...7...4...3...2.......8.7..92.4......1.......
6......1......1..3..4.5.......6...5...7...4...3...2.......8.7..92.4......1......2
6......1......1.27..4.5.......6...5...7...4...3...2.......8.7..92.4......1.......
2......1......1.23..4.5.......6...7...5...8...3...2.......4.6..9..8......1......5
8......1......1.23..4.5.......6...7...5...8...3...2.......4.9..9..7......1......5
1......6......1.23..4.5.......6...7...8...4...3...2.......8.7..62.4......1.......
1......6......1.23..4.5.......6...4...1...5...3...2.......4.7..62.7......8.......
7......1......1.23..4.5.......6...8...1...5...3...2.......4.7..62.7......8.......
8......1......1.23..4.5.......6...4...1...5...3...2.......4.9..62.7......8.......
1......6......1.23..4.5.......6...7...8...4...3...2.......8.7..61.4......2.......
9......1......2.34..5.6.......3...7...1...2...6...8.......1.6..73.8......4.......
8......1......2.34..5.6.......3...7...1...2...6...5.......1.6..73.5......4.......
2......1......2.34..5.6.......3...2...1...8...6...5.......1.6..73.9......4.......
2......1......2.34..5.6.......3...7...2...8...6...5.......1.6..73.9......4.......
2......1......2.34..5.6.......3...7...1...8...6...9.......1.6..73.9......4.......
8......1......2.34..1.5.......3...6...7...8...5...9.......7.9..63.8......2.......
8......1......2.34..2.1.......3...6...7...8...5...4.......7.5..93.8......4.......
8......1......2.34..2.5...........6...7...8...5...4.......7.5..93.8......4......1
6......1......2.34..2.5.......3...6...7...8...5...1.......7.5..93.8......4.......
1......6......1.23..4.5.......6...4...1...5...3...2.......4.7..68.7......2.......
2......1......1.83..4.5.......6...4...1...5...3...2.......4.7..68.7......2.......
3......1......1.26..4.5.......6...4...1...5...3...2.......4.7..68.7......2.......
9......1......2.34..2.5.......3...9...4...7...5...8.......4.5..36.1......8.......
6......1......2.34..2.5.......9...6...7...8...5...4.......7.5..83.6......4.......
8......1......2.34..2.1.......3...6...7...8...5...4.......7.5..94.8......3.......
4......1......2.34..5.6.......1...7...2...6...8...3.......8....71.3......6......2
1......9......2.34..5.6.......1...5...2...6...7...3.......5.8..93.4......1.......
2......1......2.34..5.6.......1...5...2...6...7...9.......5.8..93.4......1.......
6......1......2.34..2.5.......3...2...7...8...5...1.......7.5..41.8......3.......
6......1......2.34..2.5.......3...6...7...8...5...1.......7.5..4..8......3......9
6......1......2.34..8.5.......3...6...4...7...5...8.......4.5..91.7......3.......
6......1......2.34..2.5.......3...8...4...7...5...8.......4.5..91.7......3.......
.......19.....2.34..1.5.......6...7...4...1...8...3.......4.6..37.1......2.......
6......1......2.34..5.6.......1...6...2...9...7...3.......8.2..43.5......9.......
2......1......1.93..4.3.......2...5...6...4...7...8.......5.6..82.4......1.......
3......1......2.34..1.6.......4...2...7...8...6...5.......7.6..83.1......4.......
3......1......2.34..5.6.......4...9...7...8...6...5.......7.6..83.1......4.......
9......1......2.34..5.6.......3...7...2...6...1...5.......8.2..73.9......4.......
8......1......2.34..5.6.......4...7...2...6...1...5.......8.2..73.1......4.......
8......1......2.34..5.6.......1...2...7...8...6...9.......7.9..23.8......1.......
8......1......2.34..7.6.......3...7...2...6...4...8.......9.2..71.4......3.......
4......1......2.34..5.6.......3...7...2...1...6...5.......4.6..71.9......3.......
4......1......2.34..5.6.......3...7...2...8...6...5.......4.6..7..9......3......2
4......1......2.34..2.5.......4...6...7...8...5...8.......7.5..69.1......3.......
3......1......2.94..2.5.......4...2...6...7...5...7.......6.5..43.1......8.......
8......1......2.34..2.5.......4...2...6...7...5...7.......6.5..43.8......8.......
1......2......2.34..2.5.......4...6...7...8...5...8.......7.5..43.1......9.......
3......1......2.34..5.6.......4...9...7...8...6...5.......7.6..83.9......4.......
9......1......2.34..5.6.......4...2...1...8...6...5.......7.6..83.9......4.......
2......1......2.34..1.5.......3...2...6...9...5...8.......6.5..13.4......9.......
6......1......2..4..2.5.......6...7...8...9...5...3.......8.5..73.9......1......3
1......2......2.34..2.5.......4...6...7...8...5...8.......7.5..34.1......6.......
6......1..9...2.34..2.5.......4...6...7...8...5...........7.5..34.1......6.......
6......1......2.34..2.5.......4...6...7...8...5...8.......7.5..34.6......6.......
2......1......2.34..5.6.......1...5...7...6...8...3.......5.1..34.6......2.......
2......1......2.34..5.6.......1...5...7...6...8...3.......5.8..31.6......2.......
2......1......2.34..6.5.......1...6...7...8...5...9.......7.5..61.8......4.......
8......1......2.34..3.9.......1...6...7...8...5...9.......7.5..61.8......4.......
2......1......2.34..3.5.......1...6...7...8...5...4.......7.5..61.8......4.......
1......8......1.23..4.5.......2...6...7...8...5...9.......7.5..63.8......2.......
8......1......1.23..4.5.......2...6...7...8...5...9.......7....63.8......2......1
4......1......2.34..6.5.......1...6...7...8...5...9.......7.5..64.8......1.......
6......1......2.34..2.5.......6...7...8...9...5...3.......6.5..71.9......3.......
6......1......2.34..2.5.......6...7...8...9...5...3.......8.5..7..9......3......6
2......1......2.34..1.5.......4...2...6...7...5...7.......6.5..48.1......3.......
5......1......2.34..6.1.......6...5...7...1...8...3.......5.9..34.8......2.......
4......1......2.34..5.1.......6...5...7...1...9...3.......5.9..34.8......2.......
2......1......2.34..5.1.......6...5...7...1...8...3.......5.8..34.8......2.......
6......1......2.34..5.1.......6...5...7...1...8...3.......5.9..37.8......2.......
4......1......2..4..5.6.......1...6...7...5...8...3.......7.8..39.5......2......3
3......8......2.34..2.5.......4...6...7...8...5...8.......7.5..13.9......4.......
3......1......2.34..2.5.......4...6...7...8...5...8.......7.5..16.9......4.......
9......1......1.23..4.5.......2...4...7...8...5...9.......7.5..31.6......2.......
8......1......1.23..4.5.......2...6...7...8...5...4.......7.5..31.6......2.......
8......1......1.23..4.5.......2...6...7...8...5...9.......4.5..31.6......2.......
3......1......2.34..2.5.......6...2...1...8...5...4.......7.5..14.8......6.......
9......1......2.34..2.5.......6...2...7...9...5...4.......7.5..14.8......6.......
3......1......2.34..2.5.......6...2...7...8...5...4.......7.5..1..8......6......3
6......1......2.34..5.6.......1...7...2...8...4...3.......5.9..7..4......1......3
7......1......1.23..4.5.......6...5...2...4...7...3.......2.9..96.4......3.......
3......1......2.34..5.6.......9...5...7...2...6...4.......5.6..13.8......9.......
2......1......2.34..5.6.......1...5...9...2...6...4.......5.6..13.8......9.......
9......1......2.34..5.6.......1...5...7...2...6...4.......5.6..13.8......8.......
.....9.1......2.34..3.5.......4...2...6...7..95...........6.5..71.8......4.......
5......1......2.34..3.6.......4...7...2...6...1...5.......8.2..37.9......4.......
8......1......2.34..5.6.......4...7...2...6...1...5.......8.2..37.1......4.......
4......1......2.36..3.5.......4...6...7...8...5...9.......7.5..29.6......4.......
8......1......2.34..6.5.......4...6...7...8...5...9.......7.5..29.6......4.......
2......1......2.34..5.6.......3...5...7...6...8...1.......5.8..1..4......9......7
2......8......2.34..5.6.......3...7...8...5...4...1.......8.2..19.5......3.......
2......1......2.34..5.3.......6...7...8...5...4...1.......2.3..16.5......7.......
2......1......2.34..5.6.......3...5...2...6...4...7.......5.8..91.4......3.......
3......1......2.34..5.6.......1...5...2...6...4...7.......5.8..91.4......7.......
9......1......2.34..5.6.......3...5...2...6...1...7.......7.2..49.1......3.......
8......1......2.34..2.5.......4...6...7...8...5...........7.5..94.1......6......3
7......1......2.34..5.6.......3...5...2...6...1...8.......8.2..94.1......3.......
4......1......2.34..5.6.......3...5...2...6...1...7.......8....94.1......3......2
8......1......1.23..4.5.......3...9...7...8...5...4.......7.5..63.2......2.......
8......1......1.23..4.5.......3...6...7...8...5...4.......7.5..63.9......2.......
1......7......1.23..4.5.......6...4...3...5...7...2.......4.8..21.8......6.......
4......1......1.23....5.......6...4...3...5...7...2.......4.8..21.8...7..6.......
3......1......1.23..4.5.......6...4...9...5...7...2.......4.8..21.8......6.......
1......7......1.23..4.5.......6...4...3...5...7...2.......4.8..26.8......1.......
3......1......1.23..4.5.......6...4...9...5...7...2.......4.8..26.8......1.......
3......1......2.94..2.5.......4...2...6...7...5...6.......7.5..43.1......8.......
8......1......2.34..2.5.......4...2...6...7...5...6.......7.5..43.8......8.......
2......1......2.34..1.5.......4...2...6...7...5...6.......7.5..48.1......3.......
3......1......2.34..5.7.......1...5...7...6...8...4.......5.8..49.3......2.......
3......1......2.34..5.6.......1...5...7...9...8...4.......5.8..49.3......2.......
9......1......1.23..4.5.......2...4...6...9...7...3.......4.7..32.8......9.......
2......1......1.23..4.5.......2...4...6...5...7...3.......4.7..3..8......9......1
7......1......1.83..4.5.......6...4...7...5...8...3.......4.9..35.9......6.......
7......1......1.23..4.5.......6...4...7...5...1...3.......4.9..35.9......6.......
2......1......1.23..4.5.......6...4...7...5...8...3.......4.9..3..9......6......8
4......1......2.84..5.6.......3...2...7...5...8...1.......7.8..19.5......3.......
4......1......2.36..5.6.......3...2...7...5...8...1.......7.8..19.5......3.......
3......1..6...2.34....5.......4...6...2...5...7...8.......7.2..49.1......8.......
6......1......2.34..3.5.......3...6...2...5...7...8.......7.2..49.1......8.......
6......1......2.34..3.5.......4...9...2...5...7...8.......7.2..49.1......8.......
3......1......1.23..4.5.......6...4...9...5...7...2.......4.8..25.8......1.......
8......1......1.23..4.5.......6...4...3...9...7...2.......4.8..25.8......1.......
6......8......2.34..2.5.......4...6...7...8...5...8.......7.5..36.9......4.......
6......1......2.34..2.5.......4...6...7...8...5...8.......7....39.6......4......5
3......1......2.34..2.5.......4...6...7...8...5...8.......7.5..19.6......4.......
7......1......2.34..5.6.......3...7...1...6...8...5.......1.9..24.6......3.......
7......8......2.34..1.5.......6...7...4...5...5...3.......4.7..31.8......2.......
8......1......2.34..1.5.......6...7...4...8...5...3.......4.7..31.8......2.......
7......1......2.34..1.5.......6...7...4...5...5...3.......4.8..31.8......2.......
8......1......2.34..1.5.......6...7...4...5...5...3.......4.7..31.7......2.......
8......1......2.34..1.5.......6...7...4...5...5...3.......4.7..31.8......6.......
7......1......2.34..5.6.......1...7...4...6...6...3.......4.8..37.5......2.......
7......1......2.34..5.6.......5...7...4...6...6...3.......4.8..39.7......2.......
4......1......2.37..2.5.......3...6...1...5...4...7.......1.8..69.5......3.......
..3....1......2.34..5.6.......1...7...8...9...4...3.......5.6.37..4......1.......
9......1......2.34..5.4.......3...6...7...5...1...4.......8.7..43.9......2.......
8......1......1.23..4.5.......2...4...6...5...7...3.......4.1..75.6......3.......
4......1......1.23..9.5.......6...5...2...4...7...3.......2.7..86.4......3.......
4......1......2.34..5.9.......6...5...7...8...8...1.......5.9..14.3......2.......
2......1......2.34..9.5.......4...6...7...8...5...9.......7.5..38.6......4.......
8......1......2.34..2.5.......4...9...7...8...5...9.......7.5..38.6......4.......
3......1......2.34..5.7.......4...5...7...6...8...1.......5.8..12.3......9.......
9......1......2.34..5.6...........5...7...6...8...1.......5.8..12.3...9..9.......
9......1..1...2.34..5.6.......4...5...7...6...8...1.......5....12.3......9.......
3......1......2.34..5.6.......4...5...7...6...8...1.......5.8..1..3......9......2
9......1......2.34..5.6.......4...5...7...6...8...1.......5.8..12.3......3.......
3......1......2.34..8.3.......4...6...2...5...7...8.......7.2..61.9......4.......
7......1......2.34..5.3.......4...6...2...5...7...8.......7....61.9......4......2
3......1......2.34..5.3.......4...6...2...5...7...8.......7.2..61.3......4.......
..8....1......2.345...4.......6...5...6...7...7...1.......5.8..14.3......2.......
8......1......2.34..5.6.......4...7...2...5...8...6.......8....71.3......4......2
3......1......2.34..5.6.......4...7...2...5...8...6.......8.2..79.3......4.......
8......1......2.34..6.5.......4...6...7...8...5...1.......7.5..21.6......4.......
7......9......2.34..2.5.......4...2...6...7...5...3.......6.5..81.9......4.......
8......1......2.34..5.6.......9...5...2...6...7...8.......5.9..14.7......3.......
3......1......2.34..5.6.......3...5...2...6...7...8.......5.9..14.7......8.......
3......1......1.27..4.5.......3...6...7...8...5...4.......7.5..61.2......2.......
7......1......2.34..4.6.......3...5...2...6...1...7.......8.2..49.5......3.......
6......9......2.34..1.5.......4...6...7...8...5...3.......7.5..39.6......4.......
2......1......2.34..6.5.......4...6...7...8...5...3.......7.5..39.6......4.......
6......1......2.34..1.5.......4...6...7...8...5...3.......7....39.6......4......5
7......1......2.39..5.6.......3...5...6...7...2...1.......5.8..13.4......7.......
6......1......2.34..5.6.......3...9...6...7...2...1.......5.8..13.4......7.......
6......1......2.34..2.5.......4...6...7...8...5...3.......8.5..39.1......7.......
6......1......2.37..2.5.......4...6...7...8...5...3.......6.5..39.1......4.......
7......1......2.34..1.5.......4...6...9...7...5...3.......8.5..39.1......4.......
..6....1......2.345...3.......4...6...2...5...7...1.......8.2..61.3......4.......
4......1......2.39..5.6.......3...6...7...5...4...1.......2.7..18.5......3.......
8......1......2.34..2.5.......3...6...7...8...4...1.......9.5..17.6......3.......
3......1......2.34..1.5.......4...9...6...2...5...7.......1.5..27.8......4.......
6......1......2.34..1.5.......4...6...3...2...5...7.......1.5..27.8......4.......
3......1......2.74..2.5.......4...2...1...6...5...7.......6.5..47.3......8.......
....9..1......2.34..2.5.......4...2.9.1...6...5...........6.5..47.3......8.......
2......6......2.34..5.6.......1...5...7...6...8...4.......5.8..42.3......9.......
5......1......2.34..1.6.......1...5...7...6...8...4.......5.8..42.3......9.......
3......1......2.34..5.7.......1...5...7...6...8...4.......5.8..42.3......9.......
2......9......2.34..1.5.......4...2...6...7...5...8.......6.5..49.3......8.......
9......1......2.34..1.5.......4...9...6...7...5...8.......6.5..49.3......8.......
4......1......2.34..5.6.......1...5...2...9...3...7.......4.2..89.5......1.......
7......1......2.34..5.6.......1...5...2...6...3...7.......4.2..49.5......1.......
3......1......2.34..5.6.......4...7...2...8...6...5.......8.2..91.3......4.......
4......1......2.34..2.5.......3...2...1...5...7...8.......1.9..63.5......4.......
7......1......2.34..2.5.......6...7...4...5...5...3.......4.7..38.1......6.......
9......1......2.34..2.5.......6...7...4...5...5...3.......4.8..38.1......2.......
7......1......2.34..2.5.......4...2...6...7...5...8.......6.5..81.3......4.......
6......1......2.34..3.5.......4...9...2...7...5...8.......3.5..79.1......4.......
2......1......2.34..3.5.......4...6...2...9...5...8.......3.5..79.1......4.......
5......1......2..4..2.5.......4...6...7...8...1...3.......8.2..83.6......4......3
5......1......2.34..2.7.......4...6...7...8...1...3.......8.2..83.6......4.......
4......1......2.34..2.5...........6...7...8...1...3.......8.2..83.6......4......7
5......1......2.34..2.5.......4...6...7...8...1...3.......8.2..83.9......4.......
5......1......2.34..2.7.......4...6...7...3...8...1.......9.2..61.8......4.......
9......1......7.23..4.5.......2...4...6...7...2...3.......4.5..38.6......5.......
2......1......1.23..4.5.......2...4...6...7...7...3.......4.5..38.6......5.......
9......1......7.23..4.5.......3...4...6...7...3...2.......4.5..28.6......5.......
3......1......1.23..4.5.......3...4...6...7...7...2.......4.5..28.6......5.......
9......1......2.34..5.6.......1...7...7...6...4...9.......7.8..32.9......1.......
7......1......1.23..4.9.......2...6...6...7...4...8.......6.5..82.3......1.......
5......8......1.23..4.5.......3...6...5...7...4...8.......7.4..13.2......8.......
5......1......1.93..4.5.......3...6...5...7...4...8.......7.4..13.2......8.......
3......1......1.23..4.5.......3...6...5...7...4...8.......7.4..1..2......8......5
4......1......2.34..2.5.......3...6...5...7...1...4.......7.2..18.6......3.......
5......1......2.34..2.5.......3...6...5...7...1...4.......7.2..48.9......3.......
9......1......2.34..2.9.......3...6...5...7...1...4.......7.2..76.8......3.......
8......1......2.34..2.5.......3...6...5...7...1...4.......1.2..76.8......3.......
3......1......2.34..2.5.......1...6...5...7...8...4.......7.2..64.8......1.......
8......1......2.34..2.5.......1...6...5...7...3...4.......7.9..64.8......1.......
6......1......2.34..2.5.......3...6...5...7...8...1.......7.2..81.4......3.......
2.......1.....2.34..5.1.......4...6...7...5...1...3.......7.6...8.5.....34.......
6.......1.....2.34..5.6.......1...7...8...5...6...3.......8.4...1.5.....23.......
8......12.....3..4..5.6.......1...7...7...6...4...2.......7.9..2..6.....18.......
7......12.....3..4..5.6.......1...5...7...6...8...4.......5.8..4..6.....32.......
5....1.2........34..2.6.......3....7..1...6..6....2.......8.1..97........3.5.....
4....1.2........34..5.6.......3....7..1...6..6....2.......4.1..97........3.5.....
6......91.....2.3...5.6.......1...6...7...5...4...3.......8.7..13.9.....2........
4....1.2........34..5.6.......2....5..4...6..8....3.......5.8..31........9.6.....
9....1.2........34..5.6.......2....5..7...6..8....3.......5.4..31........9.6.....
ronk
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re: Looking for 19 givens

Postby Pat » Thu Jan 05, 2012 8:17 am


    Brain of Britain wrote:{ broken link act365.com/sudoku/brain.htm }
    Code: Select all

    ....4..3.98.6.1.........2..........1..4.5.7..6..........5.........9.8.76.7..3....
    ....3.....2.5.1...4.....97.........5..8.7.6..3.........59.....1...6.4.3.....8....
    .....9.......147....2......7......865...3...294......1......4....625.......8.....
    .2..........6....3.74.8.........3..2.8..4..1.6..5.........1.78.5....9..........4.




    sudoku-xls.com wrote:


      ....5..29..1..7...........8.....16..9...2...5..43.....2...........4..3..87..9.... # 63 (2005.Aug.13)
      .14.5.........6..8..2.........8....2..5.1.9..6....7.........1..7..3.........9.54. # 77 (2005.Sep.3)



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