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Jan 23 VH

 
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Earl



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

PostPosted: Fri Jan 23, 2009 2:58 am    Post subject: Jan 23 VH Reply with quote

Not your routine VH. Two xy-wings (379 then 345) will solve it.
Or a UR (45) followed by coloring (4).
Anyone see a single-step solution?

Earl
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Marty R.



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

PostPosted: Fri Jan 23, 2009 4:57 am    Post subject: Reply with quote

Code:

+----------------+------------+----------------+
| 1   247  478   | 9  237 348 | 48   6    5    |
| 289 2467 46789 | 24 27  5   | 1    3    248  |
| 5   24   3     | 6  1   48  | 9    248  7    |
+----------------+------------+----------------+
| 238 236  68    | 5  4   9   | 7    1    238  |
| 7   1    45    | 3  8   2   | 45   9    6    |
| 238 9    45    | 1  6   7   | 3458 2458 2348 |
+----------------+------------+----------------+
| 4   37   1     | 8  359 6   | 2    57   39   |
| 39  8    2     | 7  359 34  | 6    45   1    |
| 6   5    79    | 24 239 1   | 348  478  3489 |
+----------------+------------+----------------+

Play this puzzle online at the Daily Sudoku site

A four-cell XY-Chain starting with 4 in r8c6 and ending in r7c2 will create pincers on 3 in those two cells and that's all that was needed.
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cgordon



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

PostPosted: Fri Jan 23, 2009 3:08 pm    Post subject: Reply with quote

Wow! A very hard that was actually very hard.

I used 4 steps after the quad in C3. A UR for <45>; a skyscraper on <4>; and two xy-wings <379> and <345>.
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Wendy W



Joined: 04 Feb 2008
Posts: 144

PostPosted: Fri Jan 23, 2009 11:15 pm    Post subject: Reply with quote

Gosh, I didn't think it was tough. I did exactly what Earl did (as per usual!), just the 2 quick xy-wings, and it fell apart.
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cgordon



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

PostPosted: Sat Jan 24, 2009 12:55 am    Post subject: Reply with quote

Wendy - and Earl - you are absolutely right. Only two xy wings were needed.
For me, Type 1 UR's (and skyscrapers) are so easy to identify - whereas xy or xyz wings are not "pattern friendly".
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Wendy W



Joined: 04 Feb 2008
Posts: 144

PostPosted: Sat Jan 24, 2009 1:11 pm    Post subject: Reply with quote

Isn't it funny how we have individual ways of solving a puzzle! I immediately look for xy-wings and xyz-wings, but just because I find searching for x-wings to be much more cumbersome.
Not to get in another C vs. F debate, but is it any warmer up your way?
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cgordon



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

PostPosted: Sat Jan 24, 2009 4:05 pm    Post subject: Reply with quote

No. Yesterday it warmed up to –2C (28F) but today it’s –16C (3F) with a wind chill of –20C. Just to counter an earlier argument, wind chill is important because of the 30-30-30 Rule: when exposed to a 30-m.p.h. wind at -30° F (-34C), human flesh freezes solid in 30 seconds.

Sudoku weather.
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Marty R.



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

PostPosted: Sat Jan 24, 2009 4:57 pm    Post subject: Reply with quote

Yesterday was 44° (F) and today's high will be about 15°.

Quote:
I immediately look for xy-wings and xyz-wings, but just because I find searching for x-wings to be much more cumbersome.

Same here. I look for everything else first and X-Wings as a last resort after all other avenues have been exhausted.
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DennyOR



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

PostPosted: Mon Jan 26, 2009 11:01 pm    Post subject: Reply with quote

And another solution is the 379 xy-wing followed by a 359 xyz-wing.
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