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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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 Posted: Mon Dec 26, 2011 10:16 pm Post subject: Dec 27 VH |
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| XY-Wing 457 pivoted in r6c8; r5c8<>7 solves it. |
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eddieg
Joined: 12 Jan 2006
Posts: 47
Location: San Diego, CA USA
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| Posted: Tue Dec 27, 2011 5:37 pm Post subject: |
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Took an extended absense from Daily Sudoku. Recently have played the Very Hard puzzles and just wanted to post that I enjoy the site and appreciate the input on how others have solved puzzles.
Happy Holidays. |
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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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| Posted: Wed Dec 28, 2011 12:07 am Post subject: Dec 27 VH |
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| A 567 XY centred on r9c7 sorts it out as well... |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Dec 28, 2011 12:58 am Post subject: Re: Dec 27 VH |
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| hughwill wrote: | | A 567 XY centred on r9c7 sorts it out as well... |
That doesn't make any direct eliminations, but solves the puzzle with transport of the pincer from r9c1 to r8c6. Is that what you had in mind?
| Code: |
+--------+--------------+------------+
| 8 2 1 | 5 3 46 | 67 9 47 |
| 3 9 5 | 46 8 7 | 1 46 2 |
| 4 7 6 | 2 1 9 | 8 3 5 |
+--------+--------------+------------+
| 9 5 3 | 467 467 1 | 2 8 47 |
| 2 1 4 | 9 57 8 | 567 567 3 |
| 7 6 8 | 3 245 245 | 9 45 1 |
+--------+--------------+------------+
| 1 8 9 | 47 2457 245 | 3 57 6 |
| 56 3 7 | 1 9 56 | 4 2 8 |
| 56 4 2 | 8 567 3 | 57 1 9 |
+--------+--------------+------------+
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Play this puzzle online at the Daily Sudoku site |
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hughwill
Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
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| Posted: Wed Dec 28, 2011 11:48 am Post subject: Re: Dec 27 VH |
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No Marty that was not in my mind- I had just misread the puzzle! (very late- holiday cheer etc) But I wish I had seen that- it's a sharp solution!
Hugh |
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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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| Posted: Wed Dec 28, 2011 3:41 pm Post subject: Dec 27 VH |
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Also the short XY-Chain does it well.
Either r9c7=5 or If r9c7=7,then r1c7=6, so r2c8=4, so r6c8=5; r7c8<>5. |
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