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Sashimi?

dailysudoku.com Forum Index -> Solving techniques, and terminology

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Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Tue Dec 21, 2010 1:03 am Post subject: Sashimi?

Code:

+---------+----------------+----------+
| . . . | . . . | . . . |
| . . . | . . . | . . . |
| . . . | . . . | . . . |
+---------+----------------+----------+
| . . . | . . . | . . . |
| . . . | 16 . . | . . 16 |
| . . . | . . . | . . . |
+---------+----------------+----------+
| . 256 . | . 12356 123 | . 256 16 |
| . . . | 1567 . . | . . . |
| . . . | . . . | . . . |
+---------+----------------+----------+

Play this puzzle online at the Daily Sudoku site

Does this qualify as a Sashimi X-Wing? (There is an extra 1 in c4, so no Skyscraper). Either r5c4 or r7c56 must=1, precluding a 1 in r8c4.

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Tue Dec 21, 2010 5:53 am Post subject:

Yes, there's a Sashimi X-Wing. The vertex cells are marked with (*) and the fin cells are marked with (#).

Code:

+-----------------------------------+
| . . . | . . . | . . . |
| . . . | . . . | . . . |
| . . . | . . . | . . . |
|-----------+-----------+-----------|
| . . . | . . . | . . . |
| . . . | *1 . . | . . *1 |
| . . . | . . . | . . . |
|-----------+-----------+-----------|
| . . . | . #1 #1 | . . *1 |
| . . . | -1 . . | . . . |
| . . . | . . . | . . . |
+-----------------------------------+

Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Tue Dec 21, 2010 5:59 am Post subject:

Thanks Danny, you always seem to be there when a question needs answering.

keith

Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

Posted: Wed Dec 22, 2010 9:03 pm Post subject:

AKA grouped skyscraper. Keith

Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Sat Jul 28, 2012 4:03 pm Post subject:

I just did a puzzle with a good example, so I thought I'd post it.

Code:

+----------------+---------+--------------+
| 49 7 14 | 3 18 25 | 289 45 6 |
| 3 8 6 | 9 4 25 | 7 1 25 |
| 5 #149 2 | 6 18 7 | 89 3 #48 |
+----------------+---------+--------------+
| #478 5 #347 | 2 9 1 | 38 6 #478 |
| 248 -46 9 | 7 56 3 | 1 45 2458 |
| 27 16 137 | 4 56 8 | 23 9 257 |
+----------------+---------+--------------+
| 479 49 47 | 1 2 6 | 5 8 3 |
| 6 2 5 | 8 3 9 | 4 7 1 |
| 1 3 8 | 5 7 4 | 6 2 9 |
+-------------+---------+-----------------+

Note the 4s in r34. It would be a conventional Skyscraper if either r4c1 or r4c3 did not contain a 4. With both 4s present it becomes a Sashimi. Either r3c2 or one of r4c13 must be a 4; whichever, r5c2<>4.

ronk

Joined: 07 May 2006
Posts: 398

Posted: Mon Jul 30, 2012 6:40 pm Post subject:

Marty R. wrote:

Note the 4s in r34. It would be a conventional Skyscraper if either r4c1 or r4c3 did not contain a 4. With both 4s present it becomes a Sashimi.

Hmm, don't recall ever hearing of a sashimi skyscraper. Grouped skyscraper should be good enough IMO.

Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Mon Jul 30, 2012 10:53 pm Post subject:

ronk wrote:

Marty R. wrote:

Note the 4s in r34. It would be a conventional Skyscraper if either r4c1 or r4c3 did not contain a 4. With both 4s present it becomes a Sashimi.

Hmm, don't recall ever hearing of a sashimi skyscraper. Grouped skyscraper should be good enough IMO.

My wording wasn't very good. I meant that with two 4s it becomes a Sashimi X-Wing. Very Happy

keith

Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

Posted: Tue Jul 31, 2012 2:35 am Post subject:

Code:

Skyscraper:
+-----------------------------------+
| . / . | . / . | . . . |
| - / - | . * . | . . . |
| . * . | - / - | . . . |
|-----------+-----------+-----------|
| . / . | . / . | . . . |
| . / . | . / . | . . . |
| . / . | . / . | . . . |
|-----------+-----------+-----------|
| . / . | . / . | . . . |
| . / . | . / . | . . . |
| . * . | . * . | . . . |
+-----------------------------------+

Grouped Skyscraper / Finned X-wing:
+-----------------------------------+
| . / . | . / . | . . . |
| - * - | . * . | . . . |
| . * . | . / . | . . . |
|-----------+-----------+-----------|
| . / . | . / . | . . . |
| . / . | . / . | . . . |
| . / . | . / . | . . . |
|-----------+-----------+-----------|
| . / . | . / . | . . . |
| . / . | . / . | . . . |
| . * . | . * . | . . . |
+-----------------------------------+

Finned Sashimi Grouped Skyscraper:
+-----------------------------------+
| . * . | . / . | . . . |
| - / - | . * . | . . . |
| . * . | . / . | . . . |
|-----------+-----------+-----------|
| . / . | . / . | . . . |
| . / . | . / . | . . . |
| . / . | . / . | . . . |
|-----------+-----------+-----------|
| . / . | . / . | . . . |
| . / . | . / . | . . . |
| . * . | . * . | . . . |
+-----------------------------------+

Keith

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