| View previous topic :: View next topic |
| Author |
Message |
nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
|
 Posted: Mon Oct 29, 2007 7:25 am Post subject: Oct 29 vh |
 |
|
| one xy-wing, and - poof! |
|
| Back to top |
|
 |
re'born
Joined: 28 Oct 2007
Posts: 80
|
| Posted: Mon Oct 29, 2007 11:22 am Post subject: Re: Oct 29 vh |
|
|
| nataraj wrote: | | one xy-wing, and - poof! |
Alternatively, there is a UR type 1 in r13c59<78> which implies r1c9=6, solving the puzzle. |
|
| Back to top |
|
|
cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
|
| Posted: Mon Oct 29, 2007 1:57 pm Post subject: |
|
|
| I used the same UR in C59 - but also needed an X-wing on 7s in C59. Though I'm never sure whether X wings count as an "advanced technique". |
|
| Back to top |
|
|
re'born
Joined: 28 Oct 2007
Posts: 80
|
| Posted: Mon Oct 29, 2007 3:52 pm Post subject: |
|
|
| cgordon wrote: | I used the same UR in C59 - but also needed an X-wing on 7s in C59.
|
Would you show the position where you needed it?
| cgordon wrote: |
Though I'm never sure whether X wings count as an "advanced technique". |
I wouldn't count them as a basic technique, i.e., if I needed an x-wing to solve a puzzle, I would say so in a solution. |
|
| Back to top |
|
|
cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
|
| Posted: Mon Oct 29, 2007 4:00 pm Post subject: |
|
|
| Quote: | | Would you show the position where you needed it? |
C59 |
|
| Back to top |
|
|
Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
|
| Posted: Mon Oct 29, 2007 4:04 pm Post subject: |
|
|
| The Type 1 UR on 78 also did it for me. |
|
| Back to top |
|
|
re'born
Joined: 28 Oct 2007
Posts: 80
|
| Posted: Mon Oct 29, 2007 5:43 pm Post subject: |
|
|
| cgordon wrote: | | Quote: | | Would you show the position where you needed it? |
C59 |
I mean could you show me the state of your puzzle when you needed it.  |
|
| Back to top |
|
|
cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
|
| Posted: Mon Oct 29, 2007 8:00 pm Post subject: |
|
|
| Quote: | | I mean could you show me the state of your puzzle when you needed it. |
Re'born: I did the puzzle again, to get to the same state, and noticed that I had used an x-wing to establish the 7 in R2C3. I now see that I could have used an alternate technique - naked singles - given that R2C3 was the only 7 in Row 2. You could ask what kinda state was I in !! |
|
| Back to top |
|
|
re'born
Joined: 28 Oct 2007
Posts: 80
|
| Posted: Mon Oct 29, 2007 10:24 pm Post subject: |
|
|
| cgordon wrote: | | Quote: | | I mean could you show me the state of your puzzle when you needed it. |
Re'born: I did the puzzle again, to get to the same state, and noticed that I had used an x-wing to establish the 7 in R2C3. I now see that I could have used an alternate technique - naked singles - given that R2C3 was the only 7 in Row 2. You could ask what kinda state was I in !! |
Very good. This means I probably didn't make a mistake when I solved it. There's nothing like finding out that you've made an insane leap in a puzzle, but lucked into a solution anyway. The only thing worse is when you aren't so lucky.  |
|
| Back to top |
|
|
George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
|
| Posted: Mon Oct 29, 2007 10:55 pm Post subject: Re: Oct 29 vh |
|
|
| nataraj wrote: | | one xy-wing, and - poof! |
| Code: |
+-------------+------------+---------------+
| 1 389 389 | 2 78 5 | 4 689 678 |
| 6 89 7 | 1 3 4 | 5 89 2 |
| 5 2 4 | 9 78 6 | 138 138 78 |
+-------------+------------+---------------+
| 9 68 5 | 7 4 2 | 168 168 3 |
| 23 7 23 | 6 1 8 | 9 5 4 |
| 4 1 368 | 35 59 39 | 7 2 68 |
+-------------+------------+---------------+
| 7 356 236 | 358 568 1 | 2368 4 9 |
| 8 45 369 | 45 2 39 | 36 7 1 |
| 23 3469 1 | 348 689 7 | 2368 368 5 |
+-------------+------------+---------------+
|
[url=http://www.dailysudoku.com/sudoku/play.shtml?p=1:389:389:2:78:5:4: 689:678:6:89:7:1:3:4:5:89:2:5:2:4:9:78:6:138:138:78:9:68:5:7:4:2:168:168:3:23:7:23:6:1:8:9:5:4:4:1:368:35:59:39:7:2:68:7:356:236:358:568:1:2368:4:9:8: 45:369: 45:2:39:36:7:1:23:3469:1:348:689:7:2368:368:5:]Play this puzzle online[/url] at the Daily Sudoku site[/url]
I got to this point , Ignored the UR for a long time but used it since I could find no alternative "Hint" gives a 4 in box 7 but I couldn't see it, Neither can I find the XY wing - so I do not feel that I have really solved it since URs are for me - "When all else fails"!! |
|
| Back to top |
|
|
re'born
Joined: 28 Oct 2007
Posts: 80
|
| Posted: Tue Oct 30, 2007 12:40 am Post subject: Re: Oct 29 vh |
|
|
| George Woods wrote: |
I got to this point , Ignored the UR for a long time but used it since I could find no alternative "Hint" gives a 4 in box 7 but I couldn't see it, Neither can I find the XY wing - so I do not feel that I have really solved it since URs are for me - "When all else fails"!! |
Use the naked pair in column 5 to eliminate 8 from r79c5, then look for the xy-wing again. |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
