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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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 Posted: Thu Oct 17, 2013 11:20 pm Post subject: Oct 18 VH |
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| 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 |
+------------+--------+--------------+
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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: 141
Location: Pembroke, NH
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| Posted: Fri Oct 18, 2013 4:49 am Post subject: Oct 18 VH |
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| 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: 5770
Location: Rochester, NY, USA
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| Posted: Fri Oct 18, 2013 4:53 am Post subject: |
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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: 424
Location: Birmingham UK
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| Posted: Fri Oct 18, 2013 10:08 am Post subject: Oct 18 VH |
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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 |
+------------+--------+------------+
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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: 17
Location: Canada
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| Posted: Fri Oct 18, 2013 1:01 pm Post subject: |
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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: 17
Location: Canada
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| Posted: Fri Oct 18, 2013 1:05 pm Post subject: |
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| That starting point should have been Clements not hughwill |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Oct 18, 2013 3:09 pm Post subject: |
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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: 1834
Location: Northwest Arkansas USA
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| Posted: Fri Oct 18, 2013 3:09 pm Post subject: |
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Almost an xy-wing one stepper 
| 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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