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Daily sudoku classic 15/6/2011

 
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pageo1



Joined: 15 Jun 2011
Posts: 3
PostPosted: Wed Jun 15, 2011 4:07 am    Post subject: Daily sudoku classic 15/6/2011 Reply with quote
Have gone as far as possible with this puzzle, and have had to get a hint. The hint being place a 7 in row 6 column 6 can somebody tell me why?
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Jun 15, 2011 4:40 am    Post subject: Reply with quote
Is this where you are?

Code:

+-----------+---------------+----------------+
| 35 4   6  | 1378 178  2   | 135 1579  1579 |
| 2  7   8  | 13   5    9   | 134 14    6    |
| 35 1   9  | 37   6    4   | 2   8     57   |
+-----------+---------------+----------------+
| 4  268 12 | 5789 2789 3   | 15  15679 1579 |
| 7  26  5  | 4    29   1   | 8   69    3    |
| 9  38  13 | 6    78   578 | 145 1457  2    |
+-----------+---------------+----------------+
| 1  9   47 | 2    478  578 | 6   3     58   |
| 8  25  27 | 157  3    6   | 9   15    4    |
| 6  35  34 | 1589 1489 58  | 7   2     158  |
+-----------+---------------+----------------+

Play this puzzle online at the Daily Sudoku site

There is an XY-Wing, 35-38-58, pivoted in r9c2. Making the elimination therefrom and doing some subsequent cleanup will place a 7 in r6c6.
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pageo1



Joined: 15 Jun 2011
Posts: 3
PostPosted: Wed Jun 15, 2011 5:43 am    Post subject: classic 15/6 Reply with quote
Yes that is the point that I am at.
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pageo1



Joined: 15 Jun 2011
Posts: 3
PostPosted: Wed Jun 15, 2011 5:49 am    Post subject: xy wing Reply with quote
sorry am not understanding x-y wing. have just come to terms with x-wing.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Jun 15, 2011 3:41 pm    Post subject: Re: xy wing Reply with quote
pageo1 wrote:
sorry am not understanding x-y wing. have just come to terms with x-wing.

A quick definition of an XY-Wing is:

Start with a cell XY. That cell must see a cell XZ and another cell YZ. Any cell that sees both XZ and YZ cannot be Z.

Take a look at this and see if it's clear.

http://www.sudopedia.org/wiki/XY-Wing
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