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Sep 4 Hard (?)

 
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dpm



Joined: 19 Sep 2007
Posts: 10
PostPosted: Thu Sep 04, 2008 6:26 pm    Post subject: Sep 4 Hard (?) Reply with quote
I'm probably dozing, but how can I solve this puzzle from here without using advanced techniques? There's an obvious X-wing that will solve the puzzle, but we're supposed to be able to solve hard puzzles without using X wings, XY wings, etc. What did I miss?

Code:

+--------------+----------+--------------+
| 4    9   8   | 1 3   5  | 2    6  7    |
| 27   1   257 | 6 9   28 | 3    58 4    |
| 26   3   256 | 4 7   28 | 1    9  58   |
+--------------+----------+--------------+
| 5    68  9   | 3 68  4  | 7    2  1    |
| 678  4   167 | 2 168 9  | 568  3  568  |
| 3    2   16  | 5 168 7  | 68   4  9    |
+--------------+----------+--------------+
| 29   7   3   | 8 4   6  | 59   1  25   |
| 2689 568 4   | 7 25  1  | 5689 58 3    |
| 1    568 26  | 9 25  3  | 4    7  2568 |
+--------------+----------+--------------+

Play this puzzle online at the Daily Sudoku site
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Thu Sep 04, 2008 7:23 pm    Post subject: Reply with quote
dpm,

look at row 7.
The fives in row 7 must be in box 9.

That'll help you get going again.

(BTW, the x-wing (5) cols 2 and 5 provides exactly the same eliminations)
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dpm



Joined: 19 Sep 2007
Posts: 10
PostPosted: Thu Sep 04, 2008 7:57 pm    Post subject: Reply with quote
nataraj wrote:
dpm,

look at row 7.
The fives in row 7 must be in box 9.

That'll help you get going again.

(BTW, the x-wing (5) cols 2 and 5 provides exactly the same eliminations)


Thanks, I must be asleep at the wheel today. That's the same X-wing I saw, but I completely missed the simple elimination.
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