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Jun 11 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 656
Location: Dar es Salaam Tanzania

PostPosted: Fri Jun 10, 2011 11:35 pm    Post subject: Jun 11 VH Reply with quote

I used three steps: A kite, x-wing and BUG+1.
1) A kite in 9 originating from BOX 1 sets r7c9<>9. This opens
2) An X-Wing in 9 in cols 3 and 7 setting r3c1<>9 which is followed by
3) BUG+1; r8c1=5.
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prakash



Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA

PostPosted: Sat Jun 11, 2011 1:16 am    Post subject: Reply with quote

I think the kite may not be needed. The X wing followed by the BUG+1 solves the puzzle. For those who don't like BUG+1, there is an XYZ wing with 175 pivoted in r8c1 which solves the puzzle as well.
PJ
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Marty R.



Joined: 12 Feb 2006
Posts: 5121
Location: Rochester, NY, USA

PostPosted: Sat Jun 11, 2011 1:25 am    Post subject: Reply with quote

There was also at least one XY-Wing available as the second move after the X-Wing.
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Clement



Joined: 24 Apr 2006
Posts: 656
Location: Dar es Salaam Tanzania

PostPosted: Sat Jun 11, 2011 10:25 am    Post subject: Jun 11 VH Reply with quote

Prakash,
Yes, you are quite right, the kite was not needed. The x-wing was there from the beginning. It is sometimes difficult to see these things while they are in front of your eyes.
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George Woods



Joined: 28 Mar 2006
Posts: 232
Location: Dorset UK

PostPosted: Sat Jun 11, 2011 10:41 am    Post subject: Reply with quote

Code:

+-------------+---------------+----------------+
| 139 138 5   | 4   7    36   | 2    368  1389 |
| 6   4   2   | 8   135  9    | 35   7    135  |
| 139 7   89  | 2   1356 36   | 3569 3568 4    |
+-------------+---------------+----------------+
| 4   358 78  | 1   9    2367 | 356  356  235  |
| 357 9   1   | 356 356  2367 | 8    4    235  |
| 2   35  6   | 35  8    4    | 1    9    7    |
+-------------+---------------+----------------+
| 8   2   479 | 36  346  5    | 379  1    39   |
| 157 15  47  | 9   34   8    | 357  2    6    |
| 59  6   3   | 7   2    1    | 4    58   589  |
+-------------+---------------+----------------+

Play this puzzle online at the Daily Sudoku site

From this postion, or one very like it. I used the 15 59 and implied 19 in BoxA since put a 3 anywhere in BOx A and the 19 in col1 is revealed leading to r8c2 being 1. What is this type of xy wing called?
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Sat Jun 11, 2011 2:34 pm    Post subject: Reply with quote

George, if I understand your move correctly it is an xy-wing but using an almost-locked-set, in this case an almost-naked-pair 13, as one of the pincers.

The logic is...
Either a (13) pair exists in r13c1 ...
or
there is a 9 in one of r13c1, hence the pivot r9c1=5 and the other pincer r8c2=1.
In both cases, r1c2<>1 and so r8c2=1.

In eureka it would be...
Code:
anp(13=9)r13c1 - (9=5)r9c1 - (5=1)r8c2 ; r1c2<>1
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