How to name this pattern

Advanced methods and approaches for solving Sudoku puzzles

Re: How to name this pattern

Postby Mauriès Robert » Wed Mar 18, 2020 11:58 am

Hi yzfswf,
yzfwsf wrote:Another example:
Code: Select all
.---------------------------------.---------------------------------.---------------------------------.
|  6          1          39       |  348        7          89       |  2          345        45       |
|  5          7          39       |  2          14         19       |  134        8          6        |
|  8          2          4        |  5          13         6        |  139        139        7        |
:---------------------------------+---------------------------------+---------------------------------:
|  7          45         156      |  9          14568      2        |  1458       145        3        |
|  2          3459       56       |  346        134568     15       |  14589      7          4589     |
|  1349       3459       8        |  34         1345       7        |  6          1459       2        |
:---------------------------------+---------------------------------+---------------------------------:
|  149        4589       15       |  168        56         3        |  7          2          4589     |
|  139        3589       7        |  18         2          4        |  3589       6          589      |
|  34         6          2        |  7          9          58       |  3458       345        1        |
'---------------------------------'---------------------------------'---------------------------------'


These eliminations can be found like this:
-(56)r5c46->(56)r456c5 => -(56)r7c5 is not possible => (56)r5c346 => -(5)r5c3579, -6r5c5
-(5)r5c3->5r5c6->5r7c5 => -5r7c3.
That's what I call the anti-tracks technique...
Robert
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Re: How to name this pattern

Postby StrmCkr » Sat Apr 18, 2020 9:50 pm

two-definitions-of-w-wing-terminology-question-t6452.html

Since this topic came up on another thread

Its a type E W-Ring
Some do, some teach, the rest look it up.
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Re: How to name this pattern

Postby StrmCkr » Mon Apr 20, 2020 11:59 pm

rjamil wrote:
eleven wrote:SpAce had found a double w-wing here.

Or, is the pattern simply called Grouped W-Ring?

R. Jamil
yes its a W-Ring
Code: Select all
+------------------+--------------+---------------+
| 6      2    7    | 5  89   3    | 489  1    489 |
| (49)   5    48-9 | 6  7    1    | 2    89   3   |
| 3      1    8(9) | 4  2    8(9) | 6    7    5   |
+------------------+--------------+---------------+
| 1      7    3    | 8  49   5    | 49   6    2   |
| 58-49  489  459  | 2  6    (49) | 7    3    1   |
| 2      49   6    | 3  1    7    | 489  5    489 |
+------------------+--------------+---------------+
| 7      489  459  | 1  458  2    | 3    489  6   |
| 8(4)   6    1    | 9  3    8(4) | 5    2    7   |
| 589-4  3    2    | 7  458  6    | 1    489  89  |
+------------------+--------------+---------------+
Some do, some teach, the rest look it up.
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Re: How to name this pattern

Postby 999_Springs » Wed Jun 24, 2020 2:28 pm

just saw this thread

i'm mildly disappointed that my fancy names for all of the eight and nine link aic's never caught on

i mean, rotten cake made out of wood clearly sounds so much better than w-ring
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