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Dec 27 VH

 
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Clement



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

PostPosted: Mon Dec 26, 2011 10:16 pm    Post subject: Dec 27 VH Reply with quote

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

PostPosted: Tue Dec 27, 2011 5:37 pm    Post subject: Reply with quote

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: 167
Location: Birmingham UK

PostPosted: Wed Dec 28, 2011 12:07 am    Post subject: Dec 27 VH Reply with quote

A 567 XY centred on r9c7 sorts it out as well...
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Marty R.



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

PostPosted: Wed Dec 28, 2011 12:58 am    Post subject: Re: Dec 27 VH Reply with quote

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  |
+--------+--------------+------------+

Play this puzzle online at the Daily Sudoku site
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hughwill



Joined: 05 Apr 2010
Posts: 167
Location: Birmingham UK

PostPosted: Wed Dec 28, 2011 11:48 am    Post subject: Re: Dec 27 VH Reply with quote

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: 656
Location: Dar es Salaam Tanzania

PostPosted: Wed Dec 28, 2011 3:41 pm    Post subject: Dec 27 VH Reply with quote

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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