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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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 Posted: Sun Sep 23, 2007 12:25 pm Post subject: sept 23 vh |
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slept in today, but still no posts on today's. hm. No word yet from Australia, Asia, Africa and Europe? Anyway, I'll start the thread...
xwing [on "9" (rows 5 and 7) - made r6c4 into "38" inter alia], so then
xy-wing [pivot 38 - r6c4 just now made into a bivalue - how convenient, removes 9 from r4c3]
and:
xy-wing [pivot r9c8 "12" removes 3 from r4c6 and leaves "9"] |
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sdq_pete
Joined: 30 Apr 2007
Posts: 119
Location: Rotterdam, NL
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| Posted: Sun Sep 23, 2007 1:16 pm Post subject: |
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I got the first two but...
| Code: |
+-------+----------+------------+
| 9 2 3 | 4 7 8 | 5 16 16 |
| 5 7 6 | 12 29 19 | 38 38 4 |
| 8 1 4 | 5 3 6 | 2 7 9 |
+-------+----------+------------+
| 6 4 8 | 7 29 39 | 1 23 5 |
| 3 5 7 | 28 1 4 | 6 9 28 |
| 2 9 1 | 38 6 5 | 38 4 7 |
+-------+----------+------------+
| 1 3 5 | 9 4 2 | 7 68 68 |
| 4 6 2 | 13 8 7 | 9 5 13 |
| 7 8 9 | 6 5 13 | 4 123 123 |
+-------+----------+------------+
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Play this puzzle online at the Daily Sudoku site
... I have 123 at R9C8 and don't see how to get rid of the 3.
Peter |
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Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
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| Posted: Sun Sep 23, 2007 1:42 pm Post subject: |
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Peter,
Look carefully at C9. |
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sdq_pete
Joined: 30 Apr 2007
Posts: 119
Location: Rotterdam, NL
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| Posted: Sun Sep 23, 2007 2:16 pm Post subject: |
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Oh yeah, thanks! ee-aw, eeaw 
Peter |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Sep 23, 2007 2:30 pm Post subject: |
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I missed the X-wing, but:
| Code: | +----------------+----------------+----------------+
| 9 2 3 | 4 7 8 | 5 16 16 |
| 5 7 6 | 129 29 19 | 38 38 4 |
| 8 1 4 | 5 3 6 | 2 7 9 |
+----------------+----------------+----------------+
| 6 4 89 | 7 289 39 | 1 2389 5 |
| 3 5 7 | 289 1 4 | 6 289 28 |
| 2 89 1 | 38-9 6 5 | 389b 4 7 |
+----------------+----------------+----------------+
| 1 3 5 | 89a 4 2 | 7 689 68 |
| 4 6 2 | 13 89b 7 | 89a 5 13 |
| 7 89 89 | 6 5 13 | 4 12 123 |
+----------------+----------------+----------------+ |
Coloring on <9> takes out <9> in R6C4, the resulting XY-wing takes out <9> in R5C4. It ends with a BUG in R9C9.
(I now see coloring is not needed. In the above position, the XYZ-wing <39>-<389>-89> takes out the <9> in R5C4, leading to the BUG.)
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Sep 23, 2007 4:17 pm Post subject: |
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| Code: | +-------+----------+------------+
| 9 2 3 | 4 7 8 | 5 16 16 |
| 5 7 6 | 12 29 19 | 38 38 4 |
| 8 1 4 | 5 3 6 | 2 7 9 |
+-------+----------+------------+
| 6 4 8 | 7 29 39 | 1 23 5 |
| 3 5 7 | 28 1 4 | 6 9 28 |
| 2 9 1 | 38 6 5 | 38 4 7 |
+-------+----------+------------+
| 1 3 5 | 9 4 2 | 7 68 68 |
| 4 6 2 | 13 8 7 | 9 5 13 |
| 7 8 9 | 6 5 13 | 4 123 123 |
+-------+----------+------------+ |
As Asellus pointed out, locked candidates gets rid of the 3 in r9c8, at which point the XY-Wing pivoted there finishes it off, as does the BUG+1.
I'm glad to see that we seem to be getting more VHs; nine thus far in 23 days this month. While some have commented that they are not "very hard" to solve, regardless, every one of them has been generating interesting and informative discussions here and constitute the majority of the conversation on the forum. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Sun Sep 23, 2007 9:43 pm Post subject: |
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| This isn't fair! I did a skyscraper on 9s - then an x wing on 9s - then an xyz wing - then an xy wing - and now I'm still stuck. I still have a 3 in R9C8. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Sep 23, 2007 9:47 pm Post subject: |
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| As I recall, the 3 in C9 must be in ... |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Sun Sep 23, 2007 10:27 pm Post subject: |
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| Quote: | | As I recall, the 3 in C9 must be in ... |
Damn! I have so many advanced skills and yet I still get stuck on the basic stuff. Actually I still get stuck on the advanced skills - and, as demonstrated here - I still haven't learnt how to read the previous posts.
Nonetheless, this did seem a tad harder than usual VHs - maybe it wouldn't have been with the 3 in C9. |
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sheryl
Joined: 24 Sep 2007
Posts: 64
Location: New York
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| Posted: Mon Sep 24, 2007 1:31 am Post subject: todays puzzle r9 c8 getting rid of the 3 |
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i'm new to this and am stumped on r9 c8. i do not understand how to get rid of the 3. i read the post, look carefully at col. 8 but i still don't understand. would anyone mind explaining it to me. thanks.
i also don't understand the term xwing. is there somewhere i can go to see an explanation. i googled it, but it was unintelligible to me. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Sep 24, 2007 3:55 am Post subject: |
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http://www.sudopedia.org/wiki/X-Wing
As to r9c8: look at column 9. The only possibilities for a 3 are in box 9. Since box 9 must have a 3 in column 9, no other 3s can be in that box, thus the 3 at r9c8 must be removed.
P.S. Welcome to the forum. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Sep 24, 2007 11:33 am Post subject: |
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Asellus wrote: | Quote: | | I'm glad to see that we seem to be getting more VHs; nine thus far in 23 days this month. |
It would be nice to see more VHs. They seem to come in alternate day spurts and then a drought for about a week. It would be interesting to see the number of views for the different grades. Maybe the easy ones are more popular. |
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sheryl
Joined: 24 Sep 2007
Posts: 64
Location: New York
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| Posted: Mon Sep 24, 2007 2:56 pm Post subject: 9/23 |
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Marty,
I have a possibility for a 3 in r2c8 (1238), r4c8 (2389), r9 c8 (123) so obviously i have a lot to learn here. sometimes i can get the whole puzzle, sometimes i get stuck with 2 or 3 #s everywhere (like this puzzle) and i can't get any further. if you can explain anything to me, i would appreciate it.
thanks for the welcoming nod. I will be travelling for the next day or so but will be back on line then, so please don't think i'm ignoring you.
your help is very appreciated. i've only recently begun sudoku(ing) but i have become addicted and hate when i get to a point and can go no further. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Sep 24, 2007 3:54 pm Post subject: |
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Sheryl, we all had to crawl before we could walk. Keep at it, read as much as you can and don't hesitate to ask questions, there are any number of people here who will be happy to help out.
Good luck. |
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sheryl
Joined: 24 Sep 2007
Posts: 64
Location: New York
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| Posted: Fri Sep 28, 2007 7:55 pm Post subject: today's puzzle |
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| Marty, finally, one i could finish. i did yesterday's twice and both times came up empty, so you guys probably hated today's and i must confess it was very easy, but, hooray, i did it. |
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