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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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 Posted: Sat Jul 05, 2008 9:02 am Post subject: July 5 VH |
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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"
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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
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| Posted: Sat Jul 05, 2008 12:26 pm Post subject: |
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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. 
| 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
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| Posted: Sat Jul 05, 2008 2:24 pm Post subject: |
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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
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| Posted: Sat Jul 05, 2008 3:16 pm Post subject: |
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| 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.
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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"  ) |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Jul 05, 2008 3:27 pm Post subject: |
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| Two ERs did it for me. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Jul 05, 2008 3:46 pm Post subject: |
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| 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.
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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" ) |
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
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| Posted: Sat Jul 05, 2008 5:25 pm Post subject: Re: July 5 VH |
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| nataraj wrote: | Basics - skyscraper - done.
skyscraper in "3" rows 2 and 7, removes 3 from r1c8 - this is the one I used.
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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: 1113
Location: Dar es Salaam Tanzania
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| Posted: Sat Jul 05, 2008 6:59 pm Post subject: Daily Sudoku: Sat 5 Jul-2008 VH |
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| 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
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| Posted: Sat Jul 05, 2008 10:13 pm Post subject: |
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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
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| Posted: Sun Jul 06, 2008 6:54 am Post subject: |
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| put me down for the coloring one step move |
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crunched
Joined: 05 Feb 2008
Posts: 168
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| Posted: Sun Jul 06, 2008 6:58 pm Post subject: Re: Daily Sudoku: Sat 5 Jul-2008 VH |
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| 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 |
+-------------+--------------+--------------+
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[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 |
+-------------+--------------+--------------+
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[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 |
+-------------+--------------+--------------+
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[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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