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Another wapati "Sue de coq"

 
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ravel



Joined: 21 Apr 2006
Posts: 536
PostPosted: Mon Dec 17, 2007 3:06 pm    Post subject: Another wapati "Sue de coq" Reply with quote
Code:
. . .|. . 8|. 4 .
. . .|5 3 .|. . 9
. . .|. . .|. 6 5
-----+-----+-----
. 9 .|4 . 7|2 . 3
. 7 .|. 5 .|. . .
2 . .|8 . .|. 1 .
-----+-----+-----
. . .|2 . .|. . .
6 . 8|. . 1|. . .
. 2 1|9 . .|. . 4
This time a Sue (at least i think it is one) is there from the beginning.
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Asellus



Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
PostPosted: Tue Dec 18, 2007 5:40 am    Post subject: Reply with quote
It took me quite a while to spot that sneaky Sue (de Coq), but I finally did. However, I won't give it away. It is in the grid below, but not marked in any way.

Meanwhile, I found a couple of other interesting things. Here, I believe, is the grid after basics:
Code:
+----------------------+-------------------+------------------+
| 3579   1356   235679 |t167  12679   8    | 137   4     127  |
|b47    #1-468  2467   | 5    3      u46   | 178   278   9    |
| 3479  #13-48  23479  |s17   12479  @49   | 1378  6     5    |
+----------------------+-------------------+------------------+
| 18     9      56     | 4    16      7    | 2     58    3    |
| 18     7      346    |k136  5       2    | 4689  89    68   |
| 2      3456   3456   | 8    69     j369  | 4567  1     67   |
+----------------------+-------------------+------------------+
| 34579 a345    34579  | 2    4678    3456 | 15678 3578  1678 |
| 6     a345    8      |r37   47      1    | 579   23579 27   |
|a357    2      1      | 9    678     356  | 5678  3578  4    |
+----------------------+-------------------+------------------+

First, there is a nice ALS elimination in the left tower: a 3-cell {3457} ALS marked "a" and a bivalue ALS "b". The shared exclusive is <7>. The shared common <4> eliminates <4>s in the cells marked #.

Then, I was noticing the strongly linked <3>s in Box 5, marked "j" and "k", each part of an ALS. Thinking that might lead somewhere, I pursued it a bit. Turns out that those {136} and {369} ALS's weren't the interesting bit. Instead, I noticed that if "j" is true, then @ must be <9>. However, if "k" is true, then you can follow the sequence of cells marked r-s-t-u and see that @ must also be <9>. So, <9> it is.
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Asellus



Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
PostPosted: Tue Dec 18, 2007 5:43 am    Post subject: Reply with quote
PS: I will give a clue about that Sue de Coq, for those interested but needing such a clue...

It is one of those Sue de Coq situations where the shared cells also contain a locked candidate. That makes it more difficult to spot.
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