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Right One

 
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Mon Jul 30, 2007 8:22 pm    Post subject: Right One Reply with quote
I hope I send the right one this time from among my challenges.
Any help?

Earl

Code:

+-------------+---------------+---------------+
| 12  5   27  | 18  6    4    | 78   9   3    |
| 8   79  4   | 3   79   2    | 6    5   1    |
| 16  3   679 | 18  5    79   | 478  47  2    |
+-------------+---------------+---------------+
| 9   167 267 | 246 147  567  | 3    8   4567 |
| 36  4   5   | 9   37   8    | 1    2   67   |
| 236 167 8   | 246 1347 3567 | 457  467 9    |
+-------------+---------------+---------------+
| 45  8   69  | 46  2    1    | 4579 3   4567 |
| 7   69  1   | 5   349  36   | 2    46  8    |
| 45  2   3   | 7   8    69   | 59   1   456  |
+-------------+---------------+---------------+

Play this puzzle online at the Daily Sudoku site
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Asellus



Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
PostPosted: Mon Jul 30, 2007 9:06 pm    Post subject: Reply with quote
There is a W-Wing that solves the whole thing.
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Mon Jul 30, 2007 9:48 pm    Post subject: Right One Reply with quote
Asellus,

I finallly solved it with an xy-chain of seven steps from R8C8 to R8C2, eliminating the 6 at R8C6.
But your W-wing is much neater.

Thanks

Earl
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Tue Aug 14, 2007 3:54 pm    Post subject: Reply with quote
I found not one but two W-wings that solve the puzzle immediately:

'4,6' in r7c4 and r8c8, connected via 69=69 in r7c3 and r8c2, eliminating '4' from r7c7, r7c9 and r8c5 - solved.

The other one is '6,9' in r7c3 and r9c6, connected via r7c7 and r9c7, now we can remove 6 from r7c4 and the puzzle opens up.

Either way, very nice.
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