dailysudoku.com Forum Index dailysudoku.com
Discussion of Daily Sudoku puzzles
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Vanhegan extreme August 26, 2012

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other puzzles
View previous topic :: View next topic  
Author Message
arkietech



Joined: 31 Jul 2008
Posts: 1733
Location: Northwest Arkansas USA

PostPosted: Sun Aug 26, 2012 6:13 am    Post subject: Vanhegan extreme August 26, 2012 Reply with quote

Code:

 *-----------*
 |..1|.95|...|
 |...|..3|..8|
 |..3|1..|...|
 |---+---+---|
 |83.|.7.|2.5|
 |4.9|...|7.3|
 |1.5|.2.|.64|
 |---+---+---|
 |...|..2|5..|
 |9..|4..|...|
 |...|63.|8..|
 *-----------*


Play/Print this puzzle online
Back to top
View user's profile Send private message
tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Sun Aug 26, 2012 2:56 pm    Post subject: Reply with quote

Code after basics:
Code:
 *-----------------------------------------------------------*
 | 267   48    1     | 278   9     5     | 346   237   267   |
 | 2567  459   247   | 27    46    3     | 1     2579  8     |
 | 2567  4589  3     | 1     468   67    | 46    2579  2679  |
 |-------------------+-------------------+-------------------|
 | 8     3     6     | 9     7     4     | 2     1     5     |
 | 4     2     9     | 5     16    16    | 7     8     3     |
 | 1     7     5     | 3     2     8     | 9     6     4     |
 |-------------------+-------------------+-------------------|
 | 3     146   47    | 78    18    2     | 5     479   1679  |
 | 9     16    8     | 4     5     17    | 36    237   1267  |
 | 257   145   247   | 6     3     9     | 8     47    17    |
 *-----------------------------------------------------------*


4r2c5=(4-8)r3c5=r3c2-(8=4)r1c2; -4r2c23

I found the above solution only after working on a double almost xy-wing (AAXY-wing ??)

Double Almost XY-wing (18-6) plus transport, fin(4)r3c5 & fin(4)r7c2 => -6r2c5,r3c179

xy-wing: (6=8)r3c5-(8=1)r7c5-(1=6)r7c2-(6=1=7)r8c26-(7=6)r3c6;

fin: (4-8)r3c5=r3c2-(8=4)r1c2-r2c2=r2c5 ==> Conflict; -4r3c5

fin : (4)r7c2-(4=7=8=1)r7c345-(1=7)r8c6-(7=6)r3c6;

Ted
Back to top
View user's profile Send private message
arkietech



Joined: 31 Jul 2008
Posts: 1733
Location: Northwest Arkansas USA

PostPosted: Sun Aug 26, 2012 3:37 pm    Post subject: Reply with quote

tlanglet wrote:
4r2c5=(4-8)r3c5=r3c2-(8=4)r1c2; -4r2c23


Another m-wing Very Happy

Note the weak link r3c5 has 3 values.
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5181
Location: Rochester, NY, USA

PostPosted: Sun Aug 26, 2012 4:43 pm    Post subject: Reply with quote

Quote:
4r2c5=(4-8)r3c5=r3c2-(8=4)r1c2; -4r2c23


I don't understand that one. However, using the 48 in r1c2 and 468 in r3c5 yields the same two eliminations. Unfortunately, I missed the fact that that finishes the puzzle. The 46 M-Wing in r2c5 and r3c7 sets r3c2<>4.
Back to top
View user's profile Send private message
tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Sun Aug 26, 2012 5:25 pm    Post subject: Reply with quote

Marty R. wrote:
Quote:
4r2c5=(4-8)r3c5=r3c2-(8=4)r1c2; -4r2c23
I don't understand that one.


Given that either r2c5=4 or r3c5=4. If r3c5=4 then r3c5<>8, then r3c2=8, then r1c2=4; -4r2c34

Ted
Back to top
View user's profile Send private message
daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sun Aug 26, 2012 7:20 pm    Post subject: Reply with quote

Marty R. wrote:
Quote:
4r2c5=(4-8)r3c5=r3c2-(8=4)r1c2; -4r2c23

I don't understand that one. However, using the 48 in r1c2 and 468 in r3c5 yields the same two eliminations. Unfortunately, I missed the fact that that finishes the puzzle.

Marty,

As you appear to have noticed, Ted's chain follows the classical M-Wing pattern when read right-to-left. It just takes practice to notice the reverse M-Wing in chains like Ted's. As for the remining puzzle solution, basics were not specifically listed prior to Ted's grid, and he didn't list those present after the M-Wing, either.
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5181
Location: Rochester, NY, USA

PostPosted: Sun Aug 26, 2012 7:27 pm    Post subject: Reply with quote

Thanks Ted.

Easy enough to follow, but Dan referred to it as an M-Wing and if that's correct, then M-Wings have aspects to them that I'm unfamiliar with.

Starting out with noting that one cell or another must be a certain value sounds to me like a DIC as opposed to an M-Wing.
Back to top
View user's profile Send private message
arkietech



Joined: 31 Jul 2008
Posts: 1733
Location: Northwest Arkansas USA

PostPosted: Sun Aug 26, 2012 8:05 pm    Post subject: Reply with quote

Marty, it is the notation not a new form of m-wing. How is this?
Code:
 *-----------------------------------------------------------*
 | 267  a48    1     | 278   9     5     | 346   237   267   |
 | 2567  59-4  27-4  | 27   d46    3     | 1     2579  8     |
 | 2567 b4589  3     | 1    c468   67    | 46    2579  2679  |
 |-------------------+-------------------+-------------------|
 | 8     3     6     | 9     7     4     | 2     1     5     |
 | 4     2     9     | 5     16    16    | 7     8     3     |
 | 1     7     5     | 3     2     8     | 9     6     4     |
 |-------------------+-------------------+-------------------|
 | 3     146   47    | 78    18    2     | 5     479   1679  |
 | 9     16    8     | 4     5     17    | 36    237   1267  |
 | 257   145   247   | 6     3     9     | 8     47    17    |
 *-----------------------------------------------------------*
m-wing
(4=8)r1c2-r3c2=(8-4)r3c5=4r2c5; -4r2c23; lclste


If the notation would start at r2c5 it would still be the same.
edit to fix boo-boo
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5181
Location: Rochester, NY, USA

PostPosted: Sun Aug 26, 2012 9:02 pm    Post subject: Reply with quote

Danny,

Even though I don't speak Eureka, I would have figured out what was going on had the notation been reversed. I don't understand your comments about basics. After the wing, basics are all that's needed to finish it off, even though I didn't see that when I originally did the puzzle.

Dan,

Your grid with the abcd chain noted is the M-Wing that I used as my first step.

I still think Ted's explanation to me sounds like a DIC.

Thank you both, I always appreciate it when people address my questions.
Back to top
View user's profile Send private message
Luke451



Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California

PostPosted: Mon Aug 27, 2012 4:25 am    Post subject: Reply with quote

Marty R. wrote:
Starting out with noting that one cell or another must be a certain value sounds to me like a DIC as opposed to an M-Wing.

When you make comments like that I think you're doing a bit of a disservice to folks who might be trying to logically figure out some of this stuff.

Once again...that initial inference doesn't say anything about what the value of one cell or another must be. The statement is only that one value must be true. Nothing is said or implied about which one must be true.

Please don't tell us again it's all in the eye of the beholder, Marty. I know that's how you feel, but it just ain't necessarily so.

Sorry to be such a DIC.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other puzzles All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group