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Oct 7 VH

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS

PostPosted: Tue Oct 07, 2008 2:39 am    Post subject: Oct 7 VH Reply with quote

Friendly skies on a W-wing (56).

Earl
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Tue Oct 07, 2008 3:54 am    Post subject: Re: Oct 7 VH Reply with quote

Earl wrote:
Friendly skies on a W-wing (56).

Earl

Ditto.
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Tue Oct 07, 2008 6:39 am    Post subject: Reply with quote

... or overlapping xy-wings again (568 boxes 4,6)
(this time it doesn't matter which one to take, they have the same effect)

So little of the puzzle left after basics... Crying or Very sad
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Tue Oct 07, 2008 11:53 am    Post subject: Reply with quote

A simple kite solved it for me.
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Tue Oct 07, 2008 12:41 pm    Post subject: Reply with quote

For me, an ER on <6> using R6 & B7 to remove <6> from R7C6.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Tue Oct 07, 2008 1:05 pm    Post subject: Reply with quote

I was also a kite flier.

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Tue Oct 07, 2008 3:49 pm    Post subject: Reply with quote

I tried it a second time. There was an XY-Wing on 568 which didn't take me too far. I didn't use it but there was a Finned X-Wing on 6 which solved it.
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Tue Oct 07, 2008 4:54 pm    Post subject: Daily Sudoku: Tue 7-Oct-2008 VH Reply with quote

XY-Wing <568> Pivot {5,6}r5c3 eliminating 8 in r6c8 and the puzzle is solved.
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crunched



Joined: 05 Feb 2008
Posts: 168

PostPosted: Wed Oct 08, 2008 2:56 am    Post subject: Reply with quote

Code:

+--------------+---------------+------------+
| 6   7    2   | 39  349  8    | 5 134  134 |
| 5   34   9   | 6   1    2    | 8 7    34  |
| 348 1    348 | 35  345  7    | 9 6    2   |
+--------------+---------------+------------+
| 7   349  345 | 159 8    159  | 6 2    35  |
| 2   689  568 | 4   569  3    | 1 58   7   |
| 38  368  1   | 7   2    56   | 4 358  9   |
+--------------+---------------+------------+
| 1   2    346 | 8   3569 569  | 7 459  456 |
| 389 5    368 | 139 7    4    | 2 19   16  |
| 49  469  7   | 2   569  1569 | 3 1459 8   |
+--------------+---------------+------------+

Play this puzzle online at the Daily Sudoku site

An x-wing of 8s in columns 2 and 8 eliminates an 8 in C1,R6;
It also takes out an 8 in C3,R5.
This results as follows:


Code:

+------------+---------------+------------+
| 6  7   2   | 39  349  8    | 5 134  134 |
| 5  34  9   | 6   1    2    | 8 7    34  |
| 48 1   348 | 35  345  7    | 9 6    2   |
+------------+---------------+------------+
| 7  49  45  | 159 8    159  | 6 2    35  |
| 2  689 56  | 4   569  3    | 1 58   7   |
| 3  68  1   | 7   2    56   | 4 58   9   |
+------------+---------------+------------+
| 1  2   346 | 8   3569 569  | 7 459  456 |
| 89 5   368 | 139 7    4    | 2 19   16  |
| 49 469 7   | 2   569  1569 | 3 1459 8   |
+------------+---------------+------------+

Play this puzzle online at the Daily Sudoku site

This opens up an xy wing 68-56-58 with 56 as pivot...and the puzzle gets solved.
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Wed Oct 08, 2008 5:27 am    Post subject: Reply with quote

crunched wrote:
An x-wing of 8s in columns 2 and 8 eliminates an 8 in C1,R6;
It also takes out an 8 in C3,R5.


Alternatively, there are a few things that can still be achieved using more basic means:

9 in r9c2: in col 1, 9 is confined to r89c1.
8 in r6c1,r5c3: 8 in col 2 confined to r56c2.

This leaves a naked 3 in r6c1, which in turn solves a whole bunch of cells, until we get to this point:



Code:

+--------------------------+--------------------------+--------------------------+
| 6       7       2        | 9       4       8        | 5       3       1        |
| 5       3       9        | 6       1       2        | 8       7       4        |
| 48      1       48       | 35      35      7        | 9       6       2        |
+--------------------------+--------------------------+--------------------------+
| 7       49      45       | 15      8       159      | 6       2       3        |
| 2       689     56       | 4       569     3        | 1       58      7        |
| 3       68      1        | 7       2       56       | 4       58      9        |
+--------------------------+--------------------------+--------------------------+
| 1       2       346      | 8       369     69       | 7       49      5        |
| 89      5       38       | 13      7       4        | 2       19      6        |
| 49      46      7        | 2       569     1569     | 3       149     8        |
+--------------------------+--------------------------+--------------------------+
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DennyOR



Joined: 12 Sep 2007
Posts: 33
Location: Portland, Oregon

PostPosted: Wed Oct 08, 2008 7:23 pm    Post subject: Reply with quote

And from there the xy-chain 65-51-13-38-84-45-56 also solves it.
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