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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Apr 02, 2011 1:53 am Post subject: Puzzle 11/04/01: ~ Difficult |
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| Code: | +-----------------------+
| . . . | . 2 1 | 6 8 9 |
| . 2 . | . 4 . | 3 1 . |
| . . . | . . . | . 4 . |
|-------+-------+-------|
| . . . | 8 3 . | . . . |
| 7 3 . | 9 1 . | 4 . . |
| 8 . . | . . . | . 9 . |
|-------+-------+-------|
| 2 9 . | . 8 . | 1 . 4 |
| 4 5 8 | . . 2 | . 3 6 |
| 3 . . | . . . | 8 2 . |
+-----------------------+
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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 Apr 02, 2011 9:26 am Post subject: |
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Two steps - found while exploring almost-skyscrapers - indeed you can merge these as a single move...
| Quote: | AIC ; (5=6)r5c6 - r5c8=r4c8 - (6=4)r4c2 - (4=7)r1c2 - (7=3)r1c4 - r3c6=r7c6 ; r7c6<>5
skyscraper(5) r2, r7 ; r9c9<>5 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Apr 02, 2011 9:14 pm Post subject: |
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flightless skyscraper (5)r6c37 plus messy transport:
| Code: | (5)r4c3=(5)r6c3-r6c7=r3c7-r2c9=r2c4-r7c4 =(5)r7c6-r5c6=r6c5-(5)r6c3 conflict ; r6c3<>5
\ /
=r9c9-r9c56 |
[Edited: changed "-r8c4" to "-r7c4".
Ted
Last edited by tlanglet on Mon Apr 04, 2011 4:21 am; edited 1 time in total |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Apr 03, 2011 5:02 am Post subject: |
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| One of my seven-step BBDBs. |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Apr 03, 2011 5:49 pm Post subject: |
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| tlanglet wrote: | | flightless skyscraper (5)r6c37 plus messy transport: |
[Edit] Misunderstod... [/Edit]
And anyway r6c3<>5 doesn't solve the puzzle for me?
... but apart from that I'm good.. 
Last edited by peterj on Sun Apr 03, 2011 9:59 pm; edited 1 time in total |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Apr 03, 2011 9:40 pm Post subject: |
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Ted, you must have had fun trying to "connect-the-dots" with the candidate grid for <5>.
You had me going in circles looking for an alternate way to get your elimination. First, I checked the grid with my fish solver, but it only reported "unfriendly" Jellyfish. I then (manually) looking for smaller, Kraken fish. For a long time, I was stuck on a Kraken Skyscraper, but it didn't feel "right". Finally, I realized there was a Kraken X-Wing.
| Code: | Kraken X-Wing c57\r36 w/fin cell r9c5
(5)r9c5 - r9c9 = r2c9 - r3c7 = r6c7 - (5)r6c3
+-----------------------------------+
| 5 . . | . . . | . . . |
| . . . | 5 . . | . . 5 |
| . . . | 5 *5 5 | *5 . . |
|-----------+-----------+-----------|
| . . 5 | . . . | . 5 . |
| . . . | . . 5 | . 5 . |
| . . -5 | . *5 . | *5 . . |
|-----------+-----------+-----------|
| . . . | 5 . 5 | . 5 . |
| . 5 . | . . . | . . . |
| . . . | . @5 5 | . . 5 |
+-----------------------------------+
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Mon Apr 04, 2011 12:29 am Post subject: |
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| daj95376 wrote: | Kraken X-Wing c57\r36 w/fin cell r9c5
(5)r9c5 - r9c9 = r2c9 - r3c7 = r6c7 - (5)r6c3 |
Or include 5c9 for a non-kraken swordfish
swordfish (5)c579\r369 ==> r6c3<>5
remote fin (5)r2c9 - (5)r3c7 = (5)r6c7 ==> r6c3<>5 | Code: |
+-----------------------------------+
| 5 . . | . . . | . . . |
| . . . | 5 . . | . . #5 |
| . . . | 5 *5 5 | *5 . . |
|-----------+-----------+-----------|
| . . 5 | . . . | . 5 . |
| . . . | . . 5 | . 5 . |
| . . -5 | . *5 . | *5 . . |
|-----------+-----------+-----------|
| . . . | 5 . 5 | . 5 . |
| . 5 . | . . . | . . . |
| . . . | . *5 5 | . . *5 |
+-----------------------------------+ |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Apr 04, 2011 12:45 am Post subject: |
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| ronk wrote: | Or include 5c9 for a non-kraken swordfish
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I know there's a distinction; but, for me, there's no difference between an sd-Kraken fin and a remote fin -- especially when both force the save vertex cell true. So, I went with the X-Wing and the longer X-Chain instead of the Swordfish and the shorter X-Chain -- which I saw and debated. |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Mon Apr 04, 2011 1:32 am Post subject: |
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| daj95376 wrote: | | ronk wrote: | Or include 5c9 for a non-kraken swordfish
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I know there's a distinction; but, for me, there's no difference between an sd-Kraken fin and a remote fin -- especially when both force the save vertex cell true. |
Perhaps others will see the difference. A kraken-fish deduction depends upon one or more strong inferences external to the fish. A non-kraken does not. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon Apr 04, 2011 4:18 am Post subject: |
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A couple of comments are in order.
First I now see a typo in my original post which I have edited in red: "-r8c4" should be "r7c4".
Second, I have to agree with Peter that r6c3<>5 does not solve the puzzle. I obviously made an error in cleanup, either before or after the almost skyscraper. Maybe I just had to much fun trying to "connect-the-dots".
Thanks Danny and Ron for the other perspectives on this puzzle. I had noticed the Kraken x-wing possibility after solving the almost skyscraper but did not pursue it.
Ted |
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