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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Fri Jan 23, 2009 2:58 am Post subject: Jan 23 VH |
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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
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| Posted: Fri Jan 23, 2009 4:57 am Post subject: |
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| 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 |
+----------------+------------+----------------+
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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
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| Posted: Fri Jan 23, 2009 3:08 pm Post subject: |
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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
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| Posted: Fri Jan 23, 2009 11:15 pm Post subject: |
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| 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
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| Posted: Sat Jan 24, 2009 12:55 am Post subject: |
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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
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| Posted: Sat Jan 24, 2009 1:11 pm Post subject: |
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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
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| Posted: Sat Jan 24, 2009 4:05 pm Post subject: |
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No. Yesterday it warmed up to 2C (28F) but today its 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
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| Posted: Sat Jan 24, 2009 4:57 pm Post subject: |
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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
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| Posted: Mon Jan 26, 2009 11:01 pm Post subject: |
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| And another solution is the 379 xy-wing followed by a 359 xyz-wing. |
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