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July 5 VH

 
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Sat Jul 05, 2008 9:02 am    Post subject: July 5 VH Reply with quote
Basics - skyscraper - done.
skyscraper in "3" rows 2 and 7, removes 3 from r1c8 - this is the one I used.

other options:
another skyscraper "9" rows 3 and 9
and an x-wing "4"

---
edited to make visible and correct typo (skyscraper 3 is in rows 2 and 7 among others)

Last edited by nataraj on Sat Jul 05, 2008 3:22 pm; edited 1 time in total
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada
PostPosted: Sat Jul 05, 2008 12:26 pm    Post subject: Reply with quote
For those wishing to try out ER’s, there is a feast of them here on <3>.
The two 3’s in C4 with the L shaped hinge in Box 3 eliminate R8C9.
Or there are the two 3’s in C6 with Box 9 to eliminate R2C9
Or R8 with Box 3 to whack R1C4
Or R7 with Box2 for R1C7
Or R2 etc

A veritable plethora.

Edited Note: I just noticed - they also form skyscrapers - but that's not the point. This is an ER tutorial. Rolling Eyes

Code:
            
+-------+-------+-------+   
| . . . | 3 . . | . 3 3 |   
| . . . | . . 3 | . . 3 |   
| . . . | . . . | . . . |   
+-------+-------+-------+   
| . . . | . . . | . . . |   
| . . . | . . . | . . . |   
| . . . | . . . | . . . |   
+-------+-------+-------+   
| . . . | . . 3 | . 3 . |   
| . . . | 3 . . | . . 3 |   
| . . . | . . . | . . . |
+-------+-------+-------+
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Jul 05, 2008 2:24 pm    Post subject: Reply with quote
A pair of finned X-wings. ("True" means: Is <3>.)
Code:
+-------+-------+-------+   
| . . . | 3 . . | . 3 3 |   
| . . . | . . 3 | . . 3 |   
| . . . | . . . | . . . |   
+-------+-------+-------+   
| . . . | . . . | . . . |   
| . . . | . . . | . . . |   
| . . . | . . . | . . . |   
+-------+-------+-------+   
| . . . | . . 3 | . 3 . |   
| . . . | 3 . . | . . 3 |   
| . . . | . . . | . . . |
+-------+-------+-------+
Look at R18: Either the X-wing is true, or R1C8 is true. Either way, R2C9 is not true.

Look at C49: Either the X-wing is true, or R2C9 is true. Either way, R1C8 is not true.

[Corrected: R1C8 above was R1C9.]

Keith

Last edited by keith on Sat Jul 05, 2008 3:49 pm; edited 1 time in total
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Sat Jul 05, 2008 3:16 pm    Post subject: Reply with quote
keith wrote:
A pair of finned X-wings. Look at R18: Either the X-wing is true, or R1C9 is true. Either way, R2C9 is not true.


I believe I see only one x-wing (r18c49) with two fins. Looking at rows 1 and 8, the fin is r1c8 (not r1c9) and looking at cols 4 and 9 the fin is in r2c9.

Neat ... the fins eliminate each other ("self-sahimi-ing fish" Laughing)
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Jul 05, 2008 3:27 pm    Post subject: Reply with quote
Two ERs did it for me.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Jul 05, 2008 3:46 pm    Post subject: Reply with quote
nataraj wrote:
keith wrote:
A pair of finned X-wings. Look at R18: Either the X-wing is true, or R1C9 is true. Either way, R2C9 is not true.


I believe I see only one x-wing (r18c49) with two fins. Looking at rows 1 and 8, the fin is r1c8 (not r1c9) and looking at cols 4 and 9 the fin is in r2c9.

Neat ... the fins eliminate each other ("self-sahimi-ing fish" Laughing)
Yes. I think this double fin is not that uncommon. Of course, if you eliminate one fin, the other is eliminated by a regular X-wing.

By the way, the intended solution is probably an X-wing on <4>, then two XY-wings. A much longer journey.

Keith
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Jul 05, 2008 5:25 pm    Post subject: Re: July 5 VH Reply with quote
nataraj wrote:
Basics - skyscraper - done.
skyscraper in "3" rows 2 and 7, removes 3 from r1c8 - this is the one I used.



I noticed three different kites including the one in box <8> that also eliminated the <3> in r1c8 before I saw the skyscraper. Also, simple coloring eliminates <3s> from four cells including r1c8.

Ted
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Sat Jul 05, 2008 6:59 pm    Post subject: Daily Sudoku: Sat 5 Jul-2008 VH Reply with quote
X-Wing in 4's r2c67 and r6c67 eliminatng the 4's in r26. With the pair 12 in c4 eliminating 1 in r4c4 opens an XY-Wing (248) with a Pivot in r5c5 {2,8}, Pincers in r4c4{4,8} and r5c2{2,4} eliminating 4 in r4c2 solves the puzzle.
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Johan



Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
PostPosted: Sat Jul 05, 2008 10:13 pm    Post subject: Reply with quote
Always like to find a killer solution, this one lies in Box 9.

There is an Empty Rectangle for digit <3> in Box 9, the ERI(Empty Rectangle Intersection) is in R7C9, it can see one of the strong link* on <3> in R2 which

eliminates <3> in R7C6, probably one of the ER's Craig mentioned.

Code:
+--------------------------+--------------------------+--------------------------+
| 469        7         2   | 346       1      8       | 5         39       3469  |
| 46         5         8   | 9         7    * 346     | 146       2      * 1346  |
| 3          1         49  | 46        5      2       | 7         8        469   |
+--------------------------+--------------------------+--------------------------+
| 5          49        6   | 148       3      7       | 2         19       1489  |
| 7          24        1   | 5         28     9       | 3         6        48    |
| 8          249       3   | 124       6      14      | 149       5        7     |
+--------------------------+--------------------------+--------------------------+
| 1249       8         49  | 7         29     1-[3]6  | 169       139      5 eri |
| 129        6         7   | 1238      289    5       | 19 er     4 er     1239  |
| 129        3         5   | 126       4      16      | 8  er     7 er     1269  |
+--------------------------+--------------------------+--------------------------+
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sun Jul 06, 2008 6:54 am    Post subject: Reply with quote
put me down for the coloring one step move
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crunched



Joined: 05 Feb 2008
Posts: 168
PostPosted: Sun Jul 06, 2008 6:58 pm    Post subject: Re: Daily Sudoku: Sat 5 Jul-2008 VH Reply with quote
Code:

+-------------+--------------+--------------+
| 49   7   2  | 346  1   8   | 5   39  3469 |
| 6    5   8  | 9    7   34  | 14  2    13  |
| 3    1   49 | 46   5   2   | 7   8   469  |
+-------------+--------------+--------------+
| 5    49  6  | 148# 3   7   | 2   19  1489 |
| 7    24  1  | 5    28  9   | 3   6   48   |
| 8    249 3  | 124* 6   14* | 149 5   7    |
+-------------+--------------+--------------+
| 1249 8   49 | 7    29  136 | 169 139 5    |
| 129  6   7  | 1238 289 5   | 19  4   1239 |
| 129  3   5  | 12*  4   16  | 8   7   1269 |
+-------------+--------------+--------------+

[url=http://www.dailysudoku.com/sudoku/play.shtml?p=49:7:2:346:1:8:5:39:3469:6:5:8:9:7:34:14:2: 13:3:1:49:46:5:2:7:8:469:5:49:6:148:3:7:2:19:1489:7:24:1:5:28:9:3:6:48:8:249:3:124:6:14:149:5:7:1249:8:49:7:29:136:169:139:5:129:6:7:1238:289:5:19:4:1239:129:3:5:12:4:16:8:7:1269:]Play this puzzle online[/url] at the Daily Sudoku site


Clement wrote:
X-Wing in 4's r2c67 and r6c67 eliminatng the 4's in r26.


YES, and after that an xyz wing appears as shown above.



Code:

+-------------+--------------+--------------+
| 49   7   2  | 346  1   8   | 5   39* 3469 |
| 6    5   8  | 9    7   34  | 14  2    13* |
| 3    1   49 | 46   5   2   | 7   8   469  |
+-------------+--------------+--------------+
| 5    49  6  | 148# 3   7   | 2   19* 1489#|
| 7    24  1  | 5    28  9   | 3   6   48   |
| 8    249 3  | 124* 6   14* | 149 5   7    |
+-------------+--------------+--------------+
| 1249 8   49 | 7    29  136 | 169 139 5    |
| 129  6   7  | 1238 289 5   | 19  4   1239 |
| 129  3   5  | 12*  4   16  | 8   7   1269 |
+-------------+--------------+--------------+

[url=http://www.dailysudoku.com/sudoku/play.shtml?p=49:7:2:346:1:8:5:39:3469:6:5:8:9:7:34:14:2: 13:3:1:49:46:5:2:7:8:469:5:49:6:148:3:7:2:19:1489:7:24:1:5:28:9:3:6:48:8:249:3:124:6:14:149:5:7:1249:8:49:7:29:136:169:139:5:129:6:7:1238:289:5:19:4:1239:129:3:5:12:4:16:8:7:1269:]Play this puzzle online[/url] at the Daily Sudoku site

A 1-3-9 xy-WING takes out a 1 in r-4 at c-9 as shown

Code:

+-------------+--------------+--------------+
| 49   7   2  | 346  1   8   | 5   39  3469 |
| 6    5   8  | 9    7   34  | 14  2    13  |
| 3    1   49 | 46   5   2   | 7   8   469  |
+-------------+--------------+--------------+
| 5    49# 6  | 48*  3   7   | 2   19  1489 |
| 7    24* 1  | 5    28* 9   | 3   6   48   |
| 8    249 3  | 124  6   14  | 149 5   7    |
+-------------+--------------+--------------+
| 1249 8   49 | 7    29  136 | 169 139 5    |
| 129  6   7  | 1238 289 5   | 19  4   1239 |
| 129  3   5  | 12   4   16  | 8   7   1269 |
+-------------+--------------+--------------+

[url=http://www.dailysudoku.com/sudoku/play.shtml?p=49:7:2:346:1:8:5:39:3469:6:5:8:9:7:34:14:2: 13:3:1:49:46:5:2:7:8:469:5:49:6:148:3:7:2:19:1489:7:24:1:5:28:9:3:6:48:8:249:3:124:6:14:149:5:7:1249:8:49:7:29:136:169:139:5:129:6:7:1238:289:5:19:4:1239:129:3:5:12:4:16:8:7:1269:]Play this puzzle online[/url] at the Daily Sudoku site
[code]


Clement wrote:

An XY-Wing (248) with a Pivot in r5c5 {2,8}, Pincers in r4c4{4,8} and r5c2{2,4} eliminating 4 in r4c2 solves the puzzle.


YES, the 2-4-8 xy wing is shown above, eliminating the 4 in r4c2
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