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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Jul 09, 2011 6:34 am Post subject: Puzzle 11/07/09: ~ Extreme ? |
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| Code: | +-----------------------+
| 5 . . | 7 . . | . 9 4 |
| . 7 . | . . 4 | . . 6 |
| . . 4 | . . . | 7 . . |
|-------+-------+-------|
| 4 . . | 5 . . | . 8 . |
| . . . | . 4 3 | 6 . 5 |
| . 5 . | . 8 1 | . 7 . |
|-------+-------+-------|
| . . 5 | . 7 . | . 6 . |
| 6 . . | 1 . 8 | 5 4 7 |
| 7 8 . | . 6 . | . 2 1 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat Jul 09, 2011 1:22 pm Post subject: |
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Two steps - first is some sort of swordfish-variant...
| Quote: | kraken skyscraper(9) ; skyscraper(9)[r8c2=r3c2-r3c6=r7c6]=r5c2 - r5c4=r4c5 ; r8c5<>9
AIC ; (2=1)r1c5 - r3c5=r3c2 - (1=8)r2c3 - r2c4=r3c4 - (8=2)r3c9 - r12c7=r4c7 ; r4c5<>2 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Jul 09, 2011 6:32 pm Post subject: |
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While chasing an anp(), I found a Kraken column which caused major damage.
| Quote: | Kraken (9)r258c2; r8c5<>9=3
(9)r3c2-(9=26)r31c6-(2=9)r7c6;
(9)r5c2-r5c4=r4c5;
(9)r8c2;
(2=9)r3c1-r2c1=r2c5-r4c5=r4c9-(9=2)r6c9; r3c9<>2=8
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Ted
[Edit: After posting my solution, I realized that the second step is a w-wing(29) with an extended strong link (9).] |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sat Jul 09, 2011 9:46 pm Post subject: |
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| Peter & Ted: I'm glad you had fun with this puzzle. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Jul 09, 2011 10:51 pm Post subject: |
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| daj95376 wrote: | | Peter & Ted: I'm glad you had fun with this puzzle. |
Danny, I enjoy all of your puzzles  Yes, some are even more fun than others, but I spend any available time working at them.
I also realize that recently I have not been telling you how enjoyable they have been. Sorry......
Ted |
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susume
Joined: 13 May 2011
Posts: 36
Location: Southeastern US
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| Posted: Mon Jul 11, 2011 3:29 am Post subject: |
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| Danny, I just discovered your puzzles a week ago and am having great fun with them. This one took me 16 steps (gasp) and kept me intrigued for hours. I'm so glad you are posting them! |
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Luke451
Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
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| Posted: Mon Jul 11, 2011 5:22 am Post subject: |
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| peterj wrote: | Two steps - first is some sort of swordfish-variant...
| Quote: | kraken skyscraper(9) ; skyscraper(9)[r8c2=r3c2-r3c6=r7c6]=r5c2 - r5c4=r4c5 ; r8c5<>9
AIC ; (2=1)r1c5 - r3c5=r3c2 - (1=8)r2c3 - r2c4=r3c4 - (8=2)r3c9 - r12c7=r4c7 ; r4c5<>2 |
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Wow, Peter, you are great at finding these!  I am very interested in almost patterns of any kind within AICs, because they manufacture strong links.
I can see why you’d call it a kraken column, for all roads lead to Rome.
A certain ttt uses this concept a lot in very difficult puzzles. He calls them “fish,” as in turbot fish, I assume. Substituting “skyscraper” for “fish” is an accurate description. I've also seen you call them "ERs" (empty rectangles), which I don't quite get.
Here is how he has presented them in the past, just for interest:
| Code: | *--------------------------------------------------------------------*
| 5 1236 168 | 7 123 26 | 128 9 4 |
| 239 7 18 | 2389 12359 4 | 128 35 6 |
| 239 *12369 4 | 2389 12359 *269 | 7 35 28 |
|----------------------+----------------------+----------------------|
| 4 16 16 | 5 *29 7 | 239 8 239 |
| 8 *29 7 |*29 4 3 | 6 1 5 |
| 239 5 239 | 6 8 1 | 4 7 29 |
|----------------------+----------------------+----------------------|
| 1 4 5 | 239 7 *29 | 389 6 389 |
| 6 *239 239 | 1 3-9 8 | 5 4 7 |
| 7 8 39 | 4 6 5 | 39 2 1 |
*--------------------------------------------------------------------* |
(9)r4c5=r5c4-r5c2=(fish 9’s: r8c2=r3c2-r3c6=r7c6) => r8c5<>9
Thanks for popularizing this idea, I gotta get on board. |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Mon Jul 11, 2011 6:46 am Post subject: |
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Luke, names eh!
I am no expert in "fish" and normally when I post an "almost-turbot/fish" pattern where the chain only uses the same candidate digit, someone pipes up with an "actually thats a finned franken mutant swordfish" or something!
I have been inconsistent in my use of "er" I am afraid. On this board I normally restrict it to a chain with a strong link in row/col and a grouped strong link in a box; and use "turbot" for one with a pure strong link in a box.
[Edit. Deleted a "grandma to suck eggs" sentence]
Of course the AIC description is sufficient I just like to use the names!
As you say they often do a lot of damage, but some examples are I feel pretty easy to see. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Jul 13, 2011 11:50 pm Post subject: |
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Unlike the previous Extreme, July 7, this one was too extreme for me and I punted at this point:
| Code: |
+-----------------+----------------+-------------+
| 5 1236 12368 | 7 123 26 | 1238 9 4 |
| 239 7 12389 | 2389 12359 4 | 1238 35 6 |
| 239 12369 4 | 2389 12359 269 | 7 35 238 |
+-----------------+----------------+-------------+
| 4 16 16 | 5 29 7 | 239 8 239 |
| 8 29 7 | 29 4 3 | 6 1 5 |
| 239 5 239 | 6 8 1 | 4 7 29 |
+-----------------+----------------+-------------+
| 1 4 5 | 239 7 29 | 389 6 389 |
| 6 239 239 | 1 39 8 | 5 4 7 |
| 7 8 39 | 4 6 5 | 39 2 1 |
+-----------------+----------------+-------------+
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