Single Hidden Single All Singles Puzzle

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

Postby m_b_metcalf » Tue May 13, 2008 8:18 pm

udosuk wrote:The first one has 6 initial HS's and the second one 4. I only allow one initial hidden single.


Sorry, I took that to mean 'only one initial hidden single step' rather than 'only one possible initial hidden single'.

As already stated, it's hard to compete with gsf, but in the file was
Code: Select all
 6 . . . . . . . 9
 . . . 2 . . . . .
 . 2 . . 1 . . . 3
 7 . 1 . 6 . . . .
 . . . 1 . 9 . . .
 . . 3 8 4 . 1 . .
 8 . . . . . . . .
 . . 7 3 . 1 6 5 .
 . . . 4 5 . 8 . 2    25 clues (r5c4 redundant)

Regards,

Mike Metcalf
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Postby Jean-Christophe » Tue May 13, 2008 8:28 pm

m_b_metcalf wrote:
udosuk wrote:The first one has 6 initial HS's and the second one 4. I only allow one initial hidden single.


Sorry, I took that to mean 'only one initial hidden single step' rather than 'only one possible initial hidden single'.

As already stated, it's hard to compete with gsf, but in the file was
Code: Select all
 6 . . . . . . . 9
 . . . 2 . . . . .
 . 2 . . 1 . . . 3
 7 . 1 . 6 . . . .
 . . . 1 . 9 . . .
 . . 3 8 4 . 1 . .
 8 . . . . . . . .
 . . 7 3 . 1 6 5 .
 . . . 4 5 . 8 . 2    25 clues (r5c4 redundant)

Regards,

Mike Metcalf


udosuk wrote:2. No naked single to start with.


This one has 2 naked single to start with...

I found 2 others:
Givens: 24
.9.1..6.........2...7.8.9.........5.5.3..1..2..2...7...6...8..44.....1....5.74.36
Givens: 25
..5.967..2.......37...3.6........9..6...8...1..49..5...3..7.1.61..........8.4.3.7
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Postby ab » Tue May 13, 2008 9:06 pm

tarek wrote:
This not what you're after, but this is the the longest solution path for a singles puzzle:
Code: Select all
 . . 5 | 7 . . | . . . 
 . 1 . | 9 3 . | 7 . . 
 . . 6 | . . . | . . 4 
-------+-------+------
 . . 8 | . . . | . 5 . 
 . . . | . 9 . | . . . 
 . 5 . | . 7 . | . . 2 
-------+-------+------
 . 3 . | . . . | . 4 . 
 . 8 7 | . . . | . . . 
 . 4 . | . 6 8 | 3 1 .
39 Steps: 030101010101010201010101010201020101010102010101010101010101010101020203030504


WOW:!: That's amazing Tarek.
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Postby udosuk » Wed May 14, 2008 2:21 am

Thanks gsf & JC, your puzzles are the ones I'm looking for. So gsf's 21-clue puzzles are the record for now. Thanks for the efforts!

Also a big thanks to all others who spent time working on it: tarek, Pat and Mike. You guys rock!:D
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Postby Jean-Christophe » Wed May 14, 2008 2:59 am

Some more:

Givens: 23
5.8..2.43.........2.1.8...5........4..2.7....1.3.....9..6.5.8..9..........5..36.1
Givens: 23
...8.71.2...........1...5.8.6.2.....5...498....3.....7.4..7.9.6.........6..3...85
Givens: 25
5.96...78....3.6..4.6.8..........5.16.5..1..9......2....1.29..7.........2..4.7.5.
Givens: 25
..41.3.7.9.....1.4..8.9.3..3.7..5.....2...6.......6..58.6.4...3..........2.7.1..8
Givens: 24
6.5..4.71.........2.7.....3.5...2.....1.5.4.84...6.........95..3.2........8.1.7.6
Givens: 25
5.3...9....2.5....4.8.....6.....1..49.4..........6.3.73.95..4.8....1....2.7..8..9
Givens: 25
9.75.1.3..........1.8.2.6.7........43.24..5......7....2.3..9..1.........7.4.6.2.9
Givens: 25
2.5.6.9.4.........1.94.27.8.........6.1...2.55...9......7.....6....8.4....23.4.7.
Givens: 25
...7.3.45.........6.1.5.8......6...13.8...9.7......4..7.6..9..2..5......9...75.14
Givens: 25
12.8.4.53......4......7...86.....2..2.3..9..1.........9.83..5.4.........4.5.1.6.9
Givens: 25
3.4.591.6...........76.4.39....8......1...6.4..3......1.5.43.2..........2...915..
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