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Oct 18 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 640
Location: Dar es Salaam Tanzania

PostPosted: Thu Oct 17, 2013 11:20 pm    Post subject: Oct 18 VH Reply with quote

Code:

+------------+--------+--------------+
| 4  68  1   | 5 2 9  | 67 78   3    |
| 3  9   7   | 8 1 6  | 5  4    2    |
| 58 268 258 | 7 4 3  | 1  9    68   |
+------------+--------+--------------+
| 2  4   3   | 1 5 7  | 8  6    9    |
| 9  7   6   | 4 3 8  | 2  5    1    |
| 58 1   58  | 9 6 2  | 47 3    47   |
+------------+--------+--------------+
| 16 3   9   | 2 7 45 | 46 18   4568 |
| 67 5   24  | 3 8 1  | 9  27   467  |
| 17 28  248 | 6 9 45 | 3  1278 4578 |
+------------+--------+--------------+
Type 1 UR 58 in r36c13; r3c3=2 opens
XY-Wing 78-68-67 pivoted in r3c9; r9c8<>7; stte.
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kuskey



Joined: 10 Dec 2008
Posts: 120
Location: Pembroke, NH

PostPosted: Fri Oct 18, 2013 4:49 am    Post subject: Oct 18 VH Reply with quote

Slightly different route: 127 xyz-wing pivot at r9c8 opens type 1 UR on 45 does it.
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Marty R.



Joined: 12 Feb 2006
Posts: 5064
Location: Rochester, NY, USA

PostPosted: Fri Oct 18, 2013 4:53 am    Post subject: Reply with quote

Using strictly the standard VH moves, I needed the XYZ-Wing followed by an XY-Wing 68-7, pivoted in r3c9.

Note: the grid shown has a couple of extra 8s in b9 (locked 8s in r7)
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hughwill



Joined: 05 Apr 2010
Posts: 142
Location: Birmingham UK

PostPosted: Fri Oct 18, 2013 10:08 am    Post subject: Oct 18 VH Reply with quote

After 127 XYZ wing:
Code:

+------------+--------+------------+
| 4  68  1   | 5 2 9  | 67 78 3    |
| 3  9   7   | 8 1 6  | 5  4  2    |
| 58 268 258 | 7 4 3  | 1  9  68   |
+------------+--------+------------+
| 2  4   3   | 1 5 7  | 8  6  9    |
| 9  7   6   | 4 3 8  | 2  5  1    |
| 58 1   58  | 9 6 2  | 47 3  47   |
+------------+--------+------------+
| 16 3   9   | 2 7 45 | 46 18 4568 |
| 67 5   4   | 3 8 1  | 9  27 67   |
| 17 28  28  | 6 9 45 | 3  17 45   |
+------------+--------+------------+

Play this puzzle online at the Daily Sudoku site


As a further alternative to Marty's 687 XY wing- the 467 pivot r8c9
also does the trick. Nice one today- tricky basics and a number of
solutions.
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Dart45



Joined: 16 Apr 2008
Posts: 14
Location: Canada

PostPosted: Fri Oct 18, 2013 1:01 pm    Post subject: Reply with quote

I got as far as hughwill, but trying to follow the strict VH moves, I do not see the 127 XYZ-Wing suggested by kuskey and Marty R.

What am I missing?
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Dart45



Joined: 16 Apr 2008
Posts: 14
Location: Canada

PostPosted: Fri Oct 18, 2013 1:05 pm    Post subject: Reply with quote

That starting point should have been Clements not hughwill
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Marty R.



Joined: 12 Feb 2006
Posts: 5064
Location: Rochester, NY, USA

PostPosted: Fri Oct 18, 2013 3:09 pm    Post subject: Reply with quote

Dart45,

In Clement's grid, the 8s can be removed from r9c89. Then the 127 XYZ-Wing can be seen pivoted in r9c8.
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arkietech



Joined: 31 Jul 2008
Posts: 1687
Location: Northwest Arkansas USA

PostPosted: Fri Oct 18, 2013 3:09 pm    Post subject: Reply with quote

Almost an xy-wing one stepper Very Happy

Code:
 *-----------------------------------------------------------*
 | 4     68    1     | 5     2     9     |a67   b78    3     |
 | 3     9     7     | 8     1     6     | 5     4     2     |
 | 58    268   258   | 7     4     3     | 1     9     68    |
 |-------------------+-------------------+-------------------|
 | 2     4     3     | 1     5     7     | 8     6     9     |
 | 9     7     6     | 4     3     8     | 2     5     1     |
 | 58    1     58    | 9     6     2     | 47    3     47    |
 |-------------------+-------------------+-------------------|
 |c16    3     9     | 2     7     45    | 4-6  c18    4568  |
 | 67    5     24    | 3     8     1     | 9     27    467   |
 | 17    28    248   | 6     9     45    | 3     1278  4578  |
 *-----------------------------------------------------------*

(6=7)r1c7-(7=8)r1c8-(8=6)r7c18 => -6r7c7; ste

or

(6=8)r1c78-(8=6)r7c18 => -6r7c7; ste
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