Sudokus with an original rare shape

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

Postby JPF » Fri Jun 15, 2007 9:50 pm

wintder wrote:Nice puzzle jpf.

In the original r8c2 can be 9 or 8 as these are the only choices that keep the puzzle to 21 clues, with all other givens kept same.

There is one of the same rating and yet different path in this: (r5c5 changed)

Thanks and welcome to the forum !

Here are some non isomorphic puzzles with the same pattern and the same SE rating (8.9) :
Code: Select all
000000000010020030000456000005000200072010680006000400000572000090030010000000000
000000000010020030000456000005000600026070890008000400000569000030010070000000000
000000000010020030000456000005000600026070890008000400000569000090030070000000000
000000000010020030000456000005000600036010780007000400000568000080090010000000000
000000000010020030000456000005000600036010780007000400000762000080030010000000000
000000000010020030000456000005000600076010890008000400000569000030070010000000000
000000000010020030000456000005000600076010890008000400000569000030070020000000000
000000000010020030000456000005000600076030890008000400000569000020070010000000000
000000000010020030000456000005000600076030890008000400000569000030070010000000000
000000000010020030000456000005000700037010620006000400000572000080030010000000000
000000000010020030000456000005000700037080620006000400000572000090030010000000000
000000000010020030000456000005000700087010590002000400000675000020090010000000000
000000000010020030000456000005000700087030590002000400000675000020090010000000000
000000000010020030000456000007000100034010280006000500000637000020040010000000000
000000000010020030000456000007000500085010790002000400000675000020090010000000000
000000000010020030000456000007000500085030790002000400000675000020090010000000000

JPF
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Postby m_b_metcalf » Sat Jun 16, 2007 10:14 pm

claudiarabia wrote:
Mauricio wrote:More on sudoku writing, now to Claudia

Code: Select all
 . . . . . . . . .
 . . 1 2 . 3 . . .
 . 2 . . . 4 . . .
 . . 3 5 . 6 4 . .
 . . . . . . . . .
 . . 7 . . . . . .
 . 6 . 8 . 7 . 1 .
 . 9 8 3 . 2 . 7 .
 . 5 . 4 . . 9 . .


Whow!

Before doing the second part, I ...

Here's a helping hand (minimal but easy):
Code: Select all
 . . . . . . . . .
 6 7 5 . . . . 8 .
 9 . . 1 . . . 4 .
 5 . . 6 . . . 1 .
 7 3 4 . . . . 2 .
 . . . . 8 . . . .
 . . . 5 . 6 . . .
 . . 8 2 7 9 4 . .
 . 6 . . . . . 3 .

Regards,

Mike Metcalf
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Postby Mauricio » Sun Jun 17, 2007 5:39 pm

Question marks.
Code: Select all
 . . 1 . . 2 3 4 .
 . . . . 5 . . . 6
 . . 7 . . . . . 1
 . . 4 . . . . . 8
 . 9 . . . . . 5 .
 8 . . . . . 2 . .
 9 . . . . . 5 . .
 3 . . . 4 . . . .
 . 4 8 7 . . 9 . .    ER 9.0
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Postby Mauricio » Wed Jun 20, 2007 2:32 am

I have created a list of 180 degrees symmetric 18's. There are almost 24K and no two of them are isomorphic. It is zipped here.
There are essentially 1036 different patterns in that list.


Here's one with high explainer rating.
Code: Select all
1 . .|2 . .|. . .
3 . .|. . .|. 4 .
. . .|. . 5|. . 6
-----+-----+-----
. . .|4 . .|. 1 .
. 2 .|. . .|. 7 .
. 5 .|. . 8|. . .
-----+-----+-----
4 . .|1 . .|. . .
. 8 .|. . .|. . 9
. . .|. . 6|. . 5 ER 9.0
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Postby gsf » Wed Jun 20, 2007 10:18 am

Mauricio wrote:I have created a list of 180 degrees symmetric 18's.

216 of those have diagonal/antidiagonal symmetry
I'm not sure many of those have been posted
good show
the first puzzle in your catalog has this symmetry:
Code: Select all
000000080000001023004050000000600040007000500030002000000040600820300000050000000

. . . | . . . | . 8 .
. . . | . . 1 | . 2 3
. . 4 | . 5 . | . . .
------+-------+------
. . . | 6 . . | . 4 .
. . 7 | . . . | 5 . .
. 3 . | . . 2 | . . .
------+-------+------
. . . | . 4 . | 6 . .
8 2 . | 3 . . | . . .
. 5 . | . . . | . . .
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Postby Mauricio » Wed Jun 20, 2007 3:52 pm

gsf wrote:
Mauricio wrote:I have created a list of 180 degrees symmetric 18's.

216 of those have diagonal/antidiagonal symmetry
I'm not sure many of those have been posted


Yes, I started with a seed of 5 or 6 puzzles posted here and then I did a 2on/2off search that kept the symmetry.

I have done something similar and created a list of 30K 20 clues sudokus with full rotational symmetry. It is here. There are just 154 essentialy different patterns in that list, I expected more.

Here is one with high ER.
Code: Select all
. . .|. . 1|. . .
. . 2|. 3 .|4 . .
. 5 .|6 . .|. 7 .
-----+-----+-----
4 . .|. . .|2 . .
. 7 .|. . .|. 8 .
. . 3|. . .|. . 9
-----+-----+-----
. 8 .|. . 7|. 6 .
. . 9|. 4 .|3 . .
. . .|1 . .|. . .        ER 9.6


Nice patterns:
Code: Select all
. . .|1 . .|. . .
. . 2|3 . 4|1 . .
. 5 .|. . .|. 6 .
-----+-----+-----
. 3 .|. . .|. 7 1
. . .|. . .|. . .
6 8 .|. . .|. 9 .
-----+-----+-----
. 6 .|. . .|. 5 .
. . 4|2 . 1|9 . .
. . .|. . 8|. . .

Code: Select all
. . 1|2 3 .|. . .
. . 4|. 5 .|. . .
. . .|. . .|. 6 2
-----+-----+-----
. . .|. . .|. . 7
4 7 .|. . .|. 8 6
5 . .|. . .|. . .
-----+-----+-----
2 8 .|. . .|. . .
. . .|. 4 .|9 . .
. . .|. 9 7|1 . .

One without diagonal boxes.
Code: Select all
. . .|1 . .|2 . .
. . .|3 . .|4 . .
1 5 .|6 . .|. . .
-----+-----+-----
. . .|. . .|1 7 4
. . .|. . .|. . .
8 2 3|. . .|. . .
-----+-----+-----
. . .|. . 2|. 6 3
. . 4|. . 7|. . .
. . 8|. . 5|. . .
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Twisted nerve

Postby claudiarabia » Thu Jun 21, 2007 9:15 am

Hi, Mauricio,

you have done a great work with the collection of the rotational symmetric 18s! Congrats! We all waited for this.

Here a 24 called

Code: Select all
. 7 . . . 2 . 5 .
8 . . 1 . . . . 3
. . 6 . 4 . 1 . .
2 . . . . . . 9 .
. . 5 . . . 7 . .
. 4 . . . . . . 1
. . 8 . 5 . 2 . .
9 . . . . 7 . . 4
. 3 . 6 . . . 8 .
 
90°twisted nerve SE 9.0

For those who like it easier, you may change r9c8 from 8 to 7, then you get SE 8.3 or still easier, you change r7c3 from 8 to 1 then you get SE 7.2

Happy solving

Claudia
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New personl record

Postby claudiarabia » Thu Jun 21, 2007 10:06 am

With this sudoku, I broke finally my personal record of SE 9.2

Code: Select all
. . . . . 1 . . 3
. . 8 5 . . 7 . .
. 4 . . 6 . . 9 .
3 . . . . . . 6 .
. . 1 . . . 2 . .
. 9 . . . . . . 5
. 6 . . 9 . . 5 .
. . 7 . . 2 1 . .
9 . . 8 . . . . .
SE 9.4
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Re: New personl record

Postby m_b_metcalf » Thu Jun 21, 2007 1:56 pm

claudiarabia wrote:With this sudoku, I broke finally my personal record of SE 9.2


Claudia,

Congratulations!

My own news is less good. Two days before leaving home for two months (starting in Berlin), during which time I was planning to follow events in internet cafes, I find myself already in one, because my hard disk has failed and is being replaced. I have all my programs backed up on a memory stick, but my whole environment is lost and will take days to re-establish when I return. Sigh.

Just a warning to everyone to back up too!

Have a wonderful summer.

Regards,

Mike Metcalf
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Postby gsf » Thu Jun 21, 2007 3:04 pm

Mauricio wrote:
gsf wrote:
Mauricio wrote:I have created a list of 180 degrees symmetric 18's.

216 of those have diagonal/antidiagonal symmetry
I'm not sure many of those have been posted


Yes, I started with a seed of 5 or 6 puzzles posted here and then I did a 2on/2off search that kept the symmetry.

I'm not sure if you got my point
in the list of 180 deg symmetric puzzles you posted were 216 puzzles with both diagonal and antidiagonal symmetry in the same puzzle
the 180 deg puzzles have symmetry order 2
the diagonal/antidiagonal puzzles have symmetry order 4
I don't think any diagonal/antidiagonal 18s had been previously posted
so those 216 puzzles in your list are a great new find
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Postby JPF » Thu Jun 21, 2007 4:10 pm

Great work, Mauricio.
Thanks.

gsf wrote:I don't think any diagonal/antidiagonal 18s had been previously posted
so those 216 puzzles in your list are a great new find

I think some had been given by Ocean here .

JPF
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Postby JPF » Thu Jun 21, 2007 4:17 pm

Thanks Claudia, it's a nice pattern.

For a true spiral :
Code: Select all
 . . . . . 1 . . .
 . . 2 3 . . 4 . .
 . 5 . . 6 . . 7 .
 7 . . . . . . 5 .
 . . 4 . . . 8 . .
 . 6 . . . . . . 9
 . 9 . . 7 . . 6 .
 . . 8 . . 4 3 . .
 . . . 1 . . . . .

SE=9.6

JPF
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Postby gsf » Thu Jun 21, 2007 4:46 pm

JPF wrote:
gsf wrote:I don't think any diagonal/antidiagonal 18s had been previously posted
so those 216 puzzles in your list are a great new find

I think some had been given by Ocean here .

thanks JPF
I should have stuck with my orignal guess I'm not sure many of those have been posted -- just one letter off
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Re: A prize-worth sudoku

Postby Mauricio » Sat Jun 23, 2007 8:07 am

claudiarabia wrote:As far as I know, 19 is the minimal clue-number from which on you can do some horizontal symmetry. Correct me if this statement is overhauled now.


After some search I found this:
Code: Select all
1 . .|. 2 .|. . 3
. 4 .|. . .|. 5 .
. . .|. . .|. . .
-----+-----+-----
. . .|6 . 4|. . .
2 . .|. . .|. . 7
. . 3|. . .|8 . .
-----+-----+-----
. . .|2 . 5|. . .
. 5 .|. 7 .|. 9 .
. 6 .|. . .|. 4 .


More
Code: Select all
100020003040000050000306000000705000200000001300000006000010000080000040050000070
100020003040506070000000000000807000300000002600000001000060000080000040070000050
100000002030405060000000000000703000200000005800000001000080000060000030070010040
100000002030405060000000000000706000002000500800000001000080000060000030070010040
100020003040000050000000000000604000300000001200000007000030000080000060050809040
100020003040000050000010000000607000300000001800000002070000040000000000060409070
100020003040000050000301000000605000200000007300000001000070000080000040050000060
100020003040000050000010000000607000800000001300000002070000040000000000060409070
100020003040000050000010000000607000300000001500000002070000040000000000060408070
100020003040000050000010000000607000300000001800000002070000040000000000060908070
100020003040000050000010000000607000300000001800000002070000040000000000060809070
100020003040000050000010000000607000300000001800000002070000040000000000060805070
100020003040000050000010000000607000500000001300000002070000040000000000060408070
100020003040000050000010000000607000800000001300000002070000040000000000060908070
100020003040000050000010000000607000800000001300000002070000040000000000060809070
100020003040000050000010000000607000800000001300000002070000040000000000060805070
100020003040000050000010000000607000500000001800000002070000040000000000060908070
100020003040000050000010000000607000300000001800000002050000060000000000060908070
100020003040000050000010000000607000500000001800000002070000040000000000060809070
100020003040000050000010000000607000300000001800000002050000060000000000060809070
100020003040000050000010000000607000800000001500000002070000040000000000060908070
100020003040000050000010000000607000800000001300000002050000060000000000060908070
100020003040000050000010000000607000800000001500000002070000040000000000060809070
100020003040000050000010000000607000800000001300000002050000060000000000060809070
100020003040000050000010000000607000800000001500000002070000040000000000060905070
100020003040000050000010000000607000500000001800000002070000040000000000060905070
100020003040000050000010000000607000300000001800000002050000060000000000060408070
100020003040000050000010000000607000800000001500000002070000040000000000060901070
100020003040000050000010000000607000800000001300000002050000060000000000060408070
100020003040506010000000000000704000300000002800000009000080000070000040010000050
100000002030405060000000000000603000200000005700000001000070000040000030080010040
100000002030405060000000000000603000200000005700000001000070000060000080080010040
100000002030405060000000000000607000200000005800000001000080000040000070060010030
100000002030405060000000000000306000200000005700000001000070000060000080080010040
100000002030405060000000000000307000200000005800000001000080000040000070060010040
100000002030405060000000000000703000200000005800000001000080000060000040040010070
100000002030405060000000000000306000200000005700000001000070000040000030080010040
100000002030405060000000000000703000002000500800000001000080000040000030070010040
100000002030405060000000000000703000002000700800000001000080000040000030070010040
100020003040000050000000000000604000300000001700000002000010000080000060050809040
100020003040000050000000000000604000300000002700000001000010000080000060050809040
100020003040000050000000000000604000300000001700000002000010000080000060050807040
100020003040000050000000000000604000300000001700000002000010000080000060050908040
100020003040000050000000000000406000300000001200000007000070000080000040050309060
100020003040000050000010000000506000300000001700000002060000080000000000080409060
100020003040000050000010000000506000700000001300000002060000080000000000080409060
100020003040000050000010000000605000300000001700000002080000060000000000060904080
100020003040000050000010000000506000300000001700000002080000060000000000050409080
100020003040000050000010000000605000300000001700000002050000040000000000060708090
100020003040000050000010000000605000300000001700000002080000060000000000050409080
100020003040000050000306000000705000600000002300000001000060000080000040050000070
100020003040000050000010000000605000700000001300000002080000060000000000060904080
100020003040000050000010000000506000700000001300000002080000060000000000050409080
100020003040000050000010000000605000700000001300000002050000040000000000060708090
100020003040000050000010000000605000700000001300000002080000060000000000050409080
100020003040000050000010000000506000300000001700000002060000040000000000050807090
100020003040000050000010000000605000700000001800000002050000040000000000060908070
100020003040000050000010000000506000300000001700000002060000080000000000050907040
100020003040000050000010000000506000300000001700000002060000080000000000050807040
100020003040000050000010000000506000700000001800000002060000040000000000050809070
100020003040000050000010000000605000300000001700000002050000080000000000060709040
100020003040000050000010000000605000300000001700000002050000080000000000060708040
100020003040000050000010000000506000700000001300000002060000040000000000050807090
100020003040000050000010000000605000700000001800000002050000040000000000060907080
100020003040000050000010000000506000700000001300000002060000080000000000050907040
100020003040000050000010000000506000700000001300000002060000080000000000050807040
100020003040000050000010000000506000700000001800000002060000040000000000050709080
100020003040000050000010000000605000700000001300000002050000080000000000060709040
100020003040000050000010000000605000700000001300000002050000080000000000060708040
100020003040000050000010000000605000700000001800000002050000040000000000060901070
100020003040000050000010000000506000700000001800000002060000040000000000050109070
100020003040506010000000000000704000300000008900000002000090000070000040010000050
100020003040506010000000000000704000300000008900000002000080000070000040010000050
100000002030405060000000000000603000200000007800000001000080000050000030040010050
100000002030405060000000000000603000200000007800000001000080000060000040040010050
100000002030405060000000000000603000700000005200000001000070000060000080080010040
100000002030405060000000000000607000200000004800000001000080000090000070060010030
100000002030405060000000000000607000200000008900000001000090000040000070060010030
100000002030405060000000000000607000200000004800000001000080000050000070060010030
100000002030405060000000000000607000200000005800000001000080000050000070060010030
100000002030405060000000000000706000200000008900000001000090000060000050050010040
100000002030405060000000000000306000700000005200000001000070000040000030080010040
100020003040506070000000000000804000000030000900000001000090000050000040080010050
100000002030405060000000000000703000002000700800000001000080000040000090070010040
100020003040000050000000000000604000300000001700000002000010000080000060050708040
100020003040000050000000000000604000700000001300000002000010000080000060050807040
100020003040000050000000000000604000700000001300000002000010000080000060050908040
100020003040000050000000000000604000700000001800000002000010000050000060090507040
100020003040000050000000000000604000300000001700000002000010000050000060080507040
100020003040000050000000000000604000300000001700000002000010000050000060080709040
100020003040000050000000000000604000700000002800000001000010000050000060090507040
100020003040000050000000000000604000700000002800000001000010000090000060050807040
100020003040000050000000000000604000300000001700000002000010000050000060080907040
100020003040501060000000000000706000800000002300000001000080000050000040060000070
100000002030405060000000000000603000200000001700000008000070000060000040040010050
100000002030405060000000000000607000800000004200000001000080000090000070060010030
100000002030405060000000000000607000200000001800000005000080000090000070060010030
100000002030405060000000000000607000200000004008000100000080000050000070060010030
100000002030405060000000000000607000200000004800000001000080000050000030060010070
100000002030405060000000000000607000200000004800000001000080000050000070060090040
102000304050607080000000000000508000300000007400000001000030000060000050000010000
100020003040506070000000000000704000000030000800000001000080000090000040050010090
100020003040501060000000000000706000800000002300000001000080000050000090060000070
100020003040501060000000000000706000800000002300000001000080000050000070060000090
100000002030204050000000000000506000700000008200000001000070000090000060050010030
100000002030405060000000000000607000800000009200000001000080000040000070060010090
100000002030405060000000000000607000200000004008000100000080000050000030060010070
102000304050607080000000000000508000300000006400000001000030000070000050000010000
102000304050607080000000000000508000700000002400000001000030000060000050000010000
102000304050603070000000000000507000800000009400000001000080000060000050000010000
102000304050607080000000000000508000300000002700000001000030000060000050000010000
100020003040501060000000000000706000800000002300000001000080000070000090060000040
102000304050607080000000000000508000300000002008000100000030000060000050000010000
100020003040501060000000000000607000800000002300000001000080000060000040070000090
100020003040501060000000000000706000800000002300000001000080000070000050060000040
100020003040105060000000000000706000800000002300000001000080000070000050060000040
102000304050607080000000000000508000300000002008000100000030000070000050000010000
102000304050607080000000000000508000003000200008000100000030000060000050000010000
100020003040501060000000000000607000800000002300000001000080000060000040050000070
102000304050607080000000000000508000003000200008000100000030000070000050000010000

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Re: A prize-worth sudoku

Postby udosuk » Sat Jun 23, 2007 3:22 pm

Mauricio wrote:After some search I found this:
Code: Select all
1 . .|. 2 .|. . 3
. 4 .|. . .|. 5 .
. . .|. . .|. . .
-----+-----+-----
. . .|6 . 4|. . .
2 . .|. . .|. . 7
. . 3|. . .|8 . .
-----+-----+-----
. . .|2 . 5|. . .
. 5 .|. 7 .|. 9 .
. 6 .|. . .|. 4 .

For some reason this pattern reminds me of this logo:

Image

:)
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