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Vanhegan extreme August 26, 2012

 
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arkietech



Joined: 31 Jul 2008
Posts: 1834
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
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
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
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arkietech



Joined: 31 Jul 2008
Posts: 1834
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.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
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.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
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
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daj95376



Joined: 23 Aug 2008
Posts: 3854

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.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
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.
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arkietech



Joined: 31 Jul 2008
Posts: 1834
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
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
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.
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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.
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