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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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 Posted: Mon Apr 16, 2012 5:42 am Post subject: Pattern Game 52 GPF 6.2 |
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| Code: | *-----------*
|.1.|.2.|3..|
|..4|..5|.6.|
|.7.|...|..4|
|---+---+---|
|..6|8..|.7.|
|...|9..|..2|
|.5.|.17|...|
|---+---+---|
|4..|..6|.5.|
|...|4..|9.6|
|..8|...|...|
*-----------* |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Mon Apr 16, 2012 7:48 pm Post subject: |
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What is a Sue de Cog?
Tried to find an explanation but came up short.
my understanding:
Takes 3 sets a,b,and c
c is common to a and b
a or b must be in a block containing c
the other a or b must be in a row/col containing c
c contains only the digits in a and b
any c digits located in the block outside of a|b,c can be removed.
any c digits located in the row/col outside of a|b,c can be removed. | Code: |
*-----------------------------------------------------------*
| 6 1 59 | 7 2 4 | 3 89 589 |
| 23 8 4 | 13 9 5 | 127 6 a17 |
| 2359 7 2359 | 13 6 8 | 125 129 4 |
|-------------------+-------------------+-------------------|
| 139 39 6 | 8 4 2 | 15 7 359-1 |
| 178 4 17 | 9 5 3 | 6 18 2 |
| 2389 5 239 | 6 1 7 | 48 3489 389 |
|-------------------+-------------------+-------------------|
| 4 39 1379 | 2 378 6 | 17-8 5 c1378 |
| 357 2 357 | 4 378 1 | 9 b38 6 |
| 137 6 8 | 5 37 9 | 24 24 c137 |
*-----------------------------------------------------------*
Sue de Coq
a=17 r2c9
b=38 r8c8
c=1378 r79c9
(38)r8c8=(38-17)r79c9=(17)r2c9 => r7c7<>8, r4c9<>1;
stte
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DonM
Joined: 15 Sep 2009
Posts: 51
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| Posted: Mon Apr 16, 2012 8:38 pm Post subject: |
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| arkietech wrote: | What is a Sue de Cog?
Tried to find an explanation but came up short.
my understanding:
Takes 3 sets a,b,and c
c is common to a and b
a or b must be in a block containing c
the other a or b must be in a row/col containing c
c contains only the digits in a and b
any c digits located in the block outside of a|b,c can be removed.
any c digits located in the row/col outside of a|b,c can be removed. | Code: |
*-----------------------------------------------------------*
| 6 1 59 | 7 2 4 | 3 89 589 |
| 23 8 4 | 13 9 5 | 127 6 a17 |
| 2359 7 2359 | 13 6 8 | 125 129 4 |
|-------------------+-------------------+-------------------|
| 139 39 6 | 8 4 2 | 15 7 359-1 |
| 178 4 17 | 9 5 3 | 6 18 2 |
| 2389 5 239 | 6 1 7 | 48 3489 389 |
|-------------------+-------------------+-------------------|
| 4 39 1379 | 2 378 6 | 17-8 5 c1378 |
| 357 2 357 | 4 378 1 | 9 b38 6 |
| 137 6 8 | 5 37 9 | 24 24 c137 |
*-----------------------------------------------------------*
Sue de Coq
a=17 r2c9
b=38 r8c8
c=1378 r79c9
(38)r8c8=(38-17)r79c9=(17)r2c9 => r7c7<>8, r4c9<>1;
stte
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The above is the simplest form of Sue-de-coq. A Sue-de-coq can be looked at in different ways depending on your perspective such as it being a pattern exposing otherwise-hard-to-find dual-linked almost locked sets. It can be difficult to find in-depth information about it, but I wrote about it a few years ago and included a number of examples with graphics.
http://forum.enjoysudoku.com/sue-de-coq-revisited-again-asi-1-t6410.html |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Mon Apr 16, 2012 9:33 pm Post subject: |
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| DonM wrote: | The above is the simplest form of Sue-de-coq. A Sue-de-coq can be looked at in different ways depending on your perspective such as it being a pattern exposing otherwise-hard-to-find dual-linked almost locked sets. It can be difficult to find in-depth information about it, but I wrote about it a few years ago and included a number of examples with graphics.
http://forum.enjoysudoku.com/sue-de-coq-revisited-again-asi-1-t6410.html |
Thanks,  I will study and see if I can find some examples. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Tue Apr 17, 2012 12:33 am Post subject: |
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Thanks Marty -- exactly what I needed. |
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