| View previous topic :: View next topic |
| Author |
Message |
keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
|
 Posted: Fri Jun 27, 2008 9:57 pm Post subject: LA Times / Freep - June 27, 2008 |
 |
|
Not yet solved: | Code: | Puzzle: FP062708
+-------+-------+-------+
| . . . | . 4 2 | 7 . . |
| . 2 . | . 1 . | . 6 4 |
| . 1 . | . . . | 5 . . |
+-------+-------+-------+
| 1 . . | 7 . . | 6 . . |
| 6 7 . | . . . | . 2 5 |
| . . 2 | . . 8 | . . 1 |
+-------+-------+-------+
| . . 4 | . . . | . 5 . |
| 2 9 . | . 6 . | . 3 . |
| . . 7 | 2 8 . | . . . |
+-------+-------+-------+
|
Keith |
|
| Back to top |
|
 |
Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
|
| Posted: Fri Jun 27, 2008 10:15 pm Post subject: |
|
|
| This one is surprisingly tough, unless I'm missing something. It took me 5 steps: XY-Wing; Sashimi Swordfish; Turbot Fish (or ER); XY-Wing; W-Wing. |
|
| Back to top |
|
|
keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
|
| Posted: Fri Jun 27, 2008 10:47 pm Post subject: |
|
|
| Asellus wrote: | | This one is surprisingly tough, unless I'm missing something. It took me 5 steps: XY-Wing; Sashimi Swordfish; Turbot Fish (or ER); XY-Wing; W-Wing. |
You solved it? Basics get me to here: | Code: | +----------------+----------------+----------------+
| 3589 358 6 | 3589 4 2 | 7 1 389 |
| 7 2 3589 | 3589 1 359 | 389 6 4 |
| 4 1 389 | 389 7 6 | 5 89 2 |
+----------------+----------------+----------------+
| 1 3458 3589 | 7 2 349 | 6 489 389 |
| 6 7 389 | 1349 39 1349 | 3489 2 5 |
| 39 34 2 | 6 5 8 | 349 7 1 |
+----------------+----------------+----------------+
| 38 368 4 | 139 39 1379 | 2 5 679 |
| 2 9 1 | 45 6 457 | 48 3 78 |
| 35 356 7 | 2 8 349 | 1 49 69 |
+----------------+----------------+----------------+ |
There is an XY-wing 48-49-89 that takes out <8> in R2C7. With coloring on that same wing, you can take out <8> in R3C3. Leaving me here: | Code: | +----------------+----------------+----------------+
| 3589 358 6 | 3589 4 2 | 7 1 389 |
| 7 2 3589 | 3589 1 359 | 39 6 4 |
| 4 1 39 | 389 7 6 | 5 89 2 |
+----------------+----------------+----------------+
| 1 3458 3589 | 7 2 349 | 6 489 389 |
| 6 7 389 | 1349 39 1349 | 3489 2 5 |
| 39 34 2 | 6 5 8 | 349 7 1 |
+----------------+----------------+----------------+
| 38 368 4 | 139 39 1379 | 2 5 679 |
| 2 9 1 | 45 6 457 | 48 3 78 |
| 35 356 7 | 2 8 349 | 1 49 69 |
+----------------+----------------+----------------+ |
And, I am stuck.
Keith |
|
| Back to top |
|
|
Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
|
| Posted: Sat Jun 28, 2008 12:48 am Post subject: |
|
|
Keith,
That r3c3 elimination can also be seen as a Kite. You need the Sashimi Swordfish. It's in r235. See if you can spot it. |
|
| Back to top |
|
|
storm_norm
Joined: 18 Oct 2007
Posts: 1741
|
| Posted: Sat Jun 28, 2008 1:20 am Post subject: |
|
|
after basics
| Code: | .------------------.------------------.------------------.
| 3589 358 6 | 3589 4 2 | 7 1 389 |
| 7 2 3589 | 3589 1 359 | 389 6 4 |
| 4 1 389 | 389 7 6 | 5 89 2 |
:------------------+------------------+------------------:
| 1 3458 3589 | 7 2 349 | 6 489 389 |
| 6 7 389 | 1349 39 1349 | 3489 2 5 |
| 39 34 2 | 6 5 8 | 349 7 1 |
:------------------+------------------+------------------:
| 38 368 4 | 139 39 1379 | 2 5 679 |
| 2 9 1 | 45 6 457 | 48 3 78 |
| 35 356 7 | 2 8 349 | 1 49 69 |
'------------------'------------------'------------------' |
I will go along with the xy-wing to remove 8 from r2c7
coloring 8...
ER {3}
which leads to this...
| Code: | .------------------.------------------.------------------.
| 3589 358 6 | 3589 4 2 | 7 1 #389 |
| 7 2 #3589 |#3589 1 359 | 39 6 4 |
| 4 1 39 |3-89 7 6 | 5 #89 2 |
:------------------+------------------+------------------:
| 1 3458 589 | 7 2 349 | 6 489 389 |
| 6 7 #389 | 1349 39 1349 |#3489 2 5 |
| 39 34 2 | 6 5 8 | 349 7 1 |
:------------------+------------------+------------------:
| 38 368 4 | 139 39 1379 | 2 5 679 |
| 2 9 1 | 45 6 457 |#48 3 #78 |
| 35 356 7 | 2 8 349 | 1 49 69 |
'------------------'------------------'------------------' |
there is a cycle on 8 marked
(8)r2c4=(8)r2c3-(8)r5c3=(8)r5c7-(8)r8c7=(8)r8c9-(8)r1c9=(8)r3c8; r3c4<>8
one coloring move removes 9 from r1c1.
xy-wing {3,4,9} removes the 9 in r5c7 |
|
| Back to top |
|
|
Asellus
Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
|
| Posted: Sat Jun 28, 2008 4:05 am Post subject: |
|
|
The Sashimi Swordfish can also be viewed like Norm's 8-cycle of weakly connected conjugate (strong) links, though it is shorter:
(8)r3c8=(8)r3c4 - (8)r2c4=(8)r2c3 - (8)r5c3=(8)r5c7; r4c8<>8
The missing Swordfish bit is r5c8. The result is the same as Norm's cycle.
The full details of my solution path, after the XY-Wing and Sashimi Swordfish, are:
[3] Turbot Fish (or Color Wing or ER) in c1-r1-b3 removes <9> from r6c7
[4] XY-Wing, pivot r6c7, removes <9> from r5c7 (Same as Norm's)
[5] 34 WWing in r46, <4> strong link in c2, removes 3 from r4c9 |
|
| Back to top |
|
|
storm_norm
Joined: 18 Oct 2007
Posts: 1741
|
| Posted: Sat Jun 28, 2008 7:53 am Post subject: |
|
|
| I have to credit Ravel for his views on catching useless kites as in the cycle example, which combines a useless kite on 8 with two shorter conjugate strings. |
|
| Back to top |
|
|
|
|
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
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
