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May 9 VH

 
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Earl



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

PostPosted: Sat May 09, 2009 2:09 am    Post subject: May 9 VH Reply with quote

Old reliable does it again, with a choice!

Solution: Either of two apparent xy-wings, (169) or (568), will do it.

Early Earl
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Marty R.



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

PostPosted: Sat May 09, 2009 5:12 am    Post subject: Reply with quote

I never looked for wings. There was a potential DP in boxes 789 with only one way to kill it and that was all that was needed.
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crunched



Joined: 05 Feb 2008
Posts: 168

PostPosted: Sat May 09, 2009 6:12 am    Post subject: Re: May 9 VH Reply with quote

Earl wrote:
Old reliable does it again, with a choice!

Solution: Either of two apparent xy-wings, (169) or (568), will do it.

Early Earl


Here is my grid after basics.
A 6-wing from columns 4,8 removes a 6 in col 6. But that proved no help for me.
The 16-69-19 (169) xy wing did it. I don't see a 568 xy wing???


Code:

+------------+--------------+--------+
| 2 68   4   | 7   568  56  | 9 3  1 |
| 1 89   5   | 4   289  3   | 6 28 7 |
| 3 7    689 | 1   2689 26  | 4 28 5 |
+------------+--------------+--------+
| 7 289  89  | 25  4    1   | 3 59 6 |
| 4 16   3   | 9   56   8   | 7 15 2 |
| 5 1269 69  | 3   26   7   | 8 19 4 |
+------------+--------------+--------+
| 9 45   7   | 256 3    256 | 1 46 8 |
| 6 3    2   | 8   1    4   | 5 7  9 |
| 8 45   1   | 56  7    9   | 2 46 3 |
+------------+--------------+--------+

Play this puzzle online at the Daily Sudoku site
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tippwell



Joined: 19 Sep 2007
Posts: 9

PostPosted: Sat May 09, 2009 9:05 am    Post subject: Reply with quote

Crunched
Taking out that 6 means that the sixes in col 5 in box 2 disappear, and the remaining 58 in row 1 col 5 can find the other 2 components easy enough
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gindaani



Joined: 06 Mar 2009
Posts: 79

PostPosted: Sat May 09, 2009 7:13 pm    Post subject: Re: May 9 VH Reply with quote

crunched wrote:

Here is my grid after basics.
A 6-wing from columns 4,8 removes a 6 in col 6. But that proved no help for me.
The 16-69-19 (169) xy wing did it. I don't see a 568 xy wing???


In box 5, <6> can only be con column 5. This eliminates <6> from r13c5, and the 586 xy-wing becomes apparent.
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tippwell



Joined: 19 Sep 2007
Posts: 9

PostPosted: Sat May 09, 2009 9:49 pm    Post subject: Reply with quote

So i didn't even need the x wing. (In theory!)
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crunched



Joined: 05 Feb 2008
Posts: 168

PostPosted: Sun May 10, 2009 10:43 am    Post subject: Reply with quote

tippwell wrote:
So i didn't even need the x wing. (In theory!)


Thanks for pointing out finding the other xy wing. Nope, no x-wing needed as it turns out. As the saying goes, more than one way to skin a cat...even if I don't know anybody who skins cats.
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