| View previous topic :: View next topic |
| Author |
Message |
LloydB
Joined: 09 Jul 2007
Posts: 21
Location: Skagit Co., WA USA
|
 Posted: Sun Apr 28, 2013 3:09 pm Post subject: APR 28 VH |
 |
|
| An X wing on 1 in rows 2 and 6 opens up a 478 XY wing centered at R7C1 |
|
| Back to top |
|
 |
jay
Joined: 19 Feb 2013
Posts: 10
Location: Grove, Oklahoma
|
| Posted: Mon Apr 29, 2013 6:08 am Post subject: |
|
|
| Code: |
+-------------+--------------+--------------+
| 78 2 16 | 5 167 178 | 9 4 3 |
| 9 14 5 | 2 3 14 | 8 7 6 |
| 378 378 46 | 78 467 9 | 2 5 1 |
+-------------+--------------+--------------+
| 6 1348 14 | 17 5 2 | 347 9 478 |
| 5 9 7 | 4 8 3 | 6 1 2 |
| 348 1348 2 | 6 9 17 | 3457 38 4578 |
+-------------+--------------+--------------+
| 47 6 3 | 9 147 1478 | 157 2 578 |
| 1 5 9 | 378 2 6 | 347 38 478 |
| 2 47 8 | 137 147 5 | 137 6 9 |
+-------------+--------------+--------------+
|
Play this puzzle online at the Daily Sudoku site
Here is the grid after all the basics that I could find. Lloyd's X wing does not lead to a 478 xy wing from my grid. After some eliminations from the X wing, a strong link of 7s opened up in C5 in Box 8. Then this strong link of 7s in box 8, buddying (on row 9) with the strong link of 7s in Box 7, allows me to eliminate the 7 in R7C6. Then Lloyd's 478 XY wing opened up for me.
This was a tough puzzle. |
|
| Back to top |
|
|
arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
|
| Posted: Mon Apr 29, 2013 11:21 am Post subject: |
|
|
| jay wrote: | | Code: |
+-------------+--------------+--------------+
| 78 2 16 | 5 167 178 | 9 4 3 |
| 9 14 5 | 2 3 14 | 8 7 6 |
| 378 378 46 | 78 467 9 | 2 5 1 |
+-------------+--------------+--------------+
| 6 1348 14 | 17 5 2 | 347 9 478 |
| 5 9 7 | 4 8 3 | 6 1 2 |
| 348 1348 2 | 6 9 17 | 3457 38 4578 |
+-------------+--------------+--------------+
| 47 6 3 | 9 147 1478 | 157 2 578 |
| 1 5 9 | 378 2 6 | 347 38 478 |
| 2 47 8 | 137 147 5 | 137 6 9 |
+-------------+--------------+--------------+
|
Play this puzzle online at the Daily Sudoku site
Here is the grid after all the basics that I could find. Lloyd's X wing does not lead to a 478 xy wing from my grid. After some eliminations from the X wing, a strong link of 7s opened up in C5 in Box 8. Then this strong link of 7s in box 8, buddying (on row 9) with the strong link of 7s in Box 7, allows me to eliminate the 7 in R7C6. Then Lloyd's 478 XY wing opened up for me.
This was a tough puzzle. |
There is a triple in row 3
There is also a skyscraper on 4 in rows 2 and 9 removing the 4 in r3c5 and r7c6 solving the puzzle. |
|
| Back to top |
|
|
Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
|
| Posted: Mon Apr 29, 2013 1:00 pm Post subject: |
|
|
| jay wrote: | | Code: |
+-------------+--------------+--------------+
| 78 2 16 | 5 167 178 | 9 4 3 |
| 9 14 5 | 2 3 14 | 8 7 6 |
| 378 378 46 | 78 467 9 | 2 5 1 |
+-------------+--------------+--------------+
| 6 1348 14 | 17 5 2 | 347 9 478 |
| 5 9 7 | 4 8 3 | 6 1 2 |
| 348 1348 2 | 6 9 17 | 3457 38 4578 |
+-------------+--------------+--------------+
| 47 6 3 | 9 147 1478 | 157 2 578 |
| 1 5 9 | 378 2 6 | 347 38 478 |
| 2 47 8 | 137 147 5 | 137 6 9 |
+-------------+--------------+--------------+
|
Play this puzzle online at the Daily Sudoku site
Here is the grid after all the basics that I could find. Lloyd's X wing does not lead to a 478 xy wing from my grid. After some eliminations from the X wing, a strong link of 7s opened up in C5 in Box 8. Then this strong link of 7s in box 8, buddying (on row 9) with the strong link of 7s in Box 7, allows me to eliminate the 7 in R7C6. Then Lloyd's 478 XY wing opened up for me.
This was a tough puzzle. |
The X-Wing takes out the 1 in r17c6.
Then a 78 pair in r1 takes out the 7 in r1c5.
The 378 triple that Dan mentioned takes out the 7 from r3c5.
Now the only 7s in c5 are in box 8, taking out the 7 from r7c6, leaving 48 in that cell as the third cell needed for the XY-Wing. |
|
| Back to top |
|
|
LloydB
Joined: 09 Jul 2007
Posts: 21
Location: Skagit Co., WA USA
|
| Posted: Mon Apr 29, 2013 2:41 pm Post subject: |
|
|
Perhaps I should have mentioned the several basic moves required between the two VH moves.
It was indeed a tough puzzle - made even harder by the lack of a hint from Dar es Salaam. |
|
| Back to top |
|
|
gindaani
Joined: 06 Mar 2009
Posts: 79
|
| Posted: Mon Apr 29, 2013 4:32 pm Post subject: |
|
|
| Skyscraper on 4 in rows 2 and 9 is all that is necessary. |
|
| Back to top |
|
|
RobertRattley
Joined: 24 Jun 2007
Posts: 118
Location: Australia
|
| Posted: Thu May 02, 2013 9:54 pm Post subject: |
|
|
Yes, an excellent puzzle. Lot's of not-very-basic "basics".
I resonate with LloydB's first post, Marty's elaboration, and Lloyd's postcript.
(As always, I solved the puzzle before even looking at this page. But I was a few days behind being able to make an original post. I'm not usually able to consume one puzzle per day on the day of the puzzle, and only rarely can I compete with Dar es Salaam!)
Congratulations to all solvers, including the skyscraper climbers. |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
