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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Fri Jun 03, 2011 12:41 pm    Post subject: too hard? Reply with quote
one of the outtakes from the "Frequent Flyer" production run:

Code:
+-----------+-----------+-----------+
|  4  .  .  |  .  .  7  |  5  .  2  |
|  .  .  .  |  .  4  .  |  .  .  .  |
|  1  7  6  |  .  .  .  |  3  .  .  |
+-----------+-----------+-----------+
|  .  .  .  |  7  .  6  |  .  1  .  |
|  2  .  .  |  .  3  .  |  .  .  6  |
|  .  1  .  |  8  .  4  |  .  .  .  |
+-----------+-----------+-----------+
|  .  .  2  |  .  .  .  |  1  9  8  |
|  .  .  .  |  .  6  .  |  .  .  .  |
|  7  .  8  |  2  .  .  |  .  .  4  |
+-----------+-----------+-----------+


seems to be a "no stepper". At least I could not find a reasonable step. Not even a naked pair ...

Let's see what the sophisticates can do Smile I am sure there is an almost naked something or some other almost locked thingy hidden somewhere ...
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri Jun 03, 2011 11:12 pm    Post subject: Reply with quote
A non-sophisticates: 2x M-Wing, 2x chain, XY-Chain, and W-Wing.
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Sat Jun 04, 2011 12:04 pm    Post subject: Reply with quote
daj95376 wrote:
A non-sophisticates: 2x M-Wing, 2x chain, XY-Chain, and W-Wing.


Ah, there is still hope for a "reasonable" solution after all ...

Thanks, Danny, for the hints! Seems like the journey is a long one, though.
I arrived at this position after - hm, well, "basics" would be exaggerating - let's just say that I found some some singles:
Code:

+--------------------------+--------------------------+--------------------------+
| 4       389     39       | 1369    19      7        | 5       68      2        |
| 3589    2       359      | 369     4       39       | 78      678     1        |
| 1       7       6        | 5       8       2        | 3       4       9        |
+--------------------------+--------------------------+--------------------------+
| 3589    3589    3459     | 7       259     6        | 2489    1       35       |
| 2       589     4579     | 19      3       159      | 4789    578     6        |
| 6       1       3579     | 8       259     4        | 279     2357    357      |
+--------------------------+--------------------------+--------------------------+
| 35      6       2        | 4       7       35       | 1       9       8        |
| 359     4       1        | 39      6       8        | 27      2357    357      |
| 7       359     8        | 2       159     1359     | 6       35      4        |
+--------------------------+--------------------------+--------------------------+


After some tedious search, I found an AIC

(3)r9c6-(3=9)r2c6-(9=1)r1c5-(1)r9c5=(1)r9c6-(3)r9c6; r9c6<>3

but it didn't look like it would advance the solution in any significant way. Although, now come to think of it, the elimination creates at least two additional strong links, who knows ...

Very curious about those two m-wings (you know I am very partial to m-wings Smile )

Helmut
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Sat Jun 04, 2011 2:30 pm    Post subject: Reply with quote
From the off there seemed to be an almost-w-wing(19) in shute 2 that looked very promising - but I just could not find a way to make the fin 5 work.. I ended up making use of it in a more roundabout way...
I don't claim sophistication or elegance - but workmanlike!
Code:
s-wing(39) (3)r7c1=r7c6 - (3=9)r8c4 - (9)r8c1=r9c2 ; r9c2<>3
anp(19=5)r5c46 - (5=3)r7c6 - (3=5)r7c1 - (5=9)r9c2 ; r5c2<>9
(5)r5c6=w-wing(19)r5c6,r1c5 - (9=3)r2c6 - r12c4=(3-9)r8c4=r8c1 - (9=5)r9c2 ; r5c2<>5=8

I put it in SE and for a 7.2 this seemed hard!
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Jun 04, 2011 4:19 pm    Post subject: Reply with quote
nataraj wrote:
Very curious about those two m-wings (you know I am very partial to m-wings Smile )

As Peter mentioned, this puzzle does little to cooperate. Singles are nominal between the advanced steps, and other basics are scarce as well. The people in the Eureka forum would probably love it.

Since others may still be working on this puzzle, I'll only share the M-Wings and not ruin the puzzle for them.

Code:
 M-Wing 7B (3=5)r9c8 - r9c56 = (5-3)r7c6 = (3)r7c1  =>  r9c2<>3
 M-Wing 5A (9=3)r2c6 - r12c4 = (3-9)r8c4 = (9)r8c1  =>  r2c1<>9

Regards, Danny
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
PostPosted: Sun Jun 05, 2011 12:33 pm    Post subject: Reply with quote
Thanks !

I should have looked for those grouped wings.
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