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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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 Posted: Wed Jan 28, 2015 10:06 pm Post subject: Jan 29 VH |
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| Code: |
+----------+--------+----------+
| 14 9 14 | 2 6 3 | 5 8 7 |
| 3 2 8 | 9 5 7 | 16 46 14 |
| 6 7 5 | 8 4 1 | 9 3 2 |
+----------+--------+----------+
| 9 8 7 | 6 2 4 | 3 1 5 |
| 2 4 3 | 5 1 8 | 7 9 6 |
| 5 1 6 | 3 7 9 | 4 2 8 |
+----------+--------+----------+
| 17 5 9 | 4 8 2 | 16 67 3 |
| 8 6 14 | *17 3 5 | 2 #47 9 |
| 147 3 2 | 7-1 9 6 | 8 5 *14 |
+----------+--------+----------+
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XY-Wing 47-1 pivoted in r8c8; r9c4<>1; stte
Also BUG+1; r9c1=1 |
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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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| Posted: Thu Jan 29, 2015 9:48 am Post subject: Jan 29 VH |
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| Code: |
+----------+--------+----------+
| 14 9 14 | 2 6 3 | 5 8 7 |
| 3 2 8 | 9 5 7 | 16 46 14 |
| 6 7 5 | 8 4 1 | 9 3 2 |
+----------+--------+----------+
| 9 8 7 | 6 2 4 | 3 1 5 |
| 2 4 3 | 5 1 8 | 7 9 6 |
| 5 1 6 | 3 7 9 | 4 2 8 |
+----------+--------+----------+
| 17 5 9 | 4 8 2 | 16 67 3 |
| 8 6 14 | 17 3 5 | 2 47 9 |
| 147 3 2 | 17 9 6 | 8 5 14 |
+----------+--------+----------+
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Play this puzzle online at the Daily Sudoku site
There's a second one-step 147 XY-Wing pivoted on r8c3. (Too many basics
and too little VH for my liking, but I suppose we should be thankful for the
few VHs that the software has produced in 2015.) |
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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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| Posted: Fri Jan 30, 2015 11:58 am Post subject: alternately |
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| Can't remember what it is called BUT every unfilled cell has double candidate bar 1 in box 7 . the forgotten rule is "set this to the value common to the triad" i.e in this example r9c1 =1 and this solves it |
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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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| Posted: Fri Jan 30, 2015 12:09 pm Post subject: Re: alternately |
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| George Woods wrote: | | Can't remember what it is called BUT every unfilled cell has double candidate bar 1 in box 7 . the forgotten rule is "set this to the value common to the triad" i.e in this example r9c1 =1 and this solves it |
It's the BUG+1 I think. I notice there's also a 17 W-Wing> r8c3=4 which sets it (or is it a skyscraper....?) |
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