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Nov 28 VH

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hughwill

Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

Posted: Mon Nov 28, 2016 10:57 am Post subject: Nov 28 VH

Code:

+--------------+------------+-------------+
| 1 57 3 | 25 8 4 | 26 9 267 |
| 9 578 458 | 6 1 25 | 248 478 3 |
| 28 6 248 | 3 7 9 | 5 48 1 |
+--------------+------------+-------------+
| 3578 2 58 | 4 39 37 | 1 678 679 |
| 47 9 1 | 8 5 6 | 3 2 47 |
| 3478 38 6 | 1 239 237 | 89 5 479 |
+--------------+------------+-------------+
| 6 1 7 | 25 4 8 | 29 3 259 |
| 235 35 9 | 7 236 1 | 246 46 8 |
| 238 4 28 | 9 236 235 | 7 1 256 |
+--------------+------------+-------------+

Play this puzzle online at the Daily Sudoku site

Two stepper (select white space to view):

Quote:

X-Wing on 8 c27 followed
immediately by a 45-7 XY-Wing pivot r2c3 removing the 7
from r1c9 stte

I found the first wing very hard to see for some reason...
Hugh

Earl

Joined: 30 May 2007
Posts: 677
Location: Victoria, KS

Posted: Mon Nov 28, 2016 2:54 pm Post subject: Nov 28 VH

Lots of x-wings; then 457 xy-wing at R2C3, R1C9 cannot be 7 Early Earl

JC Van Hay

Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

Posted: Mon Nov 28, 2016 5:59 pm Post subject:

XWing(2C49)-(2=9)r7c7; stte

hughwill

Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

Posted: Mon Nov 28, 2016 10:57 pm Post subject:

JC Van Hay wrote:

XWing(2C49)-(2=9)r7c7; stte

I'm confused, did I miss an elimination of 2 in r9c9?

JC Van Hay

Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

Posted: Tue Nov 29, 2016 7:47 am Post subject:

hughwill wrote:

JC Van Hay wrote:

XWing(2C49)-(2=9)r7c7; stte

I'm confused, did I miss an elimination of 2 in r9c9?

No, the solutions of the XWing{2r17c4, 2r179c9} only exclude 2r7c7.

hughwill

Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

Posted: Tue Nov 29, 2016 9:42 am Post subject:

JC Van Hay wrote:

hughwill wrote:

JC Van Hay wrote:

XWing(2C49)-(2=9)r7c7; stte

I'm confused, did I miss an elimination of 2 in r9c9?

No, the solutions of the XWing{2r17c4, 2r179c9} only exclude 2r7c7.

So it's a sort of extended X wing rather than the simple 2 rows or two columns
type?
Hugh

JC Van Hay

Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

Posted: Tue Nov 29, 2016 11:20 am Post subject:

hughwill wrote:

type?

Type : Finned X-Wing

Note :
If the solutions of a set of all the candidates of a digit in N units exclude a set of candidates, than that set is simply called an N-Fish. Or, if
N=1 : a "Cyclopsfish" [Types : Pointing/Claiming or Locked Candidates type 1/2 or Box-line/Line-box interaction],
N=2 : an X-Wing [Types : Pointing/Claiming, Basic/Finned/Sashimi X-Wing, [Grouped] Skyscraper, [Grouped] 2-Stringed Kite, Empty Rectangle, Turbot Fish],
N=3 : a Swordfish [Types : Basic Swordfish, Unfinned/Finned/Sashimi Basic/Franken/Mutant Swordfish, Kraken X-Wing]
...
Due to the numerous types of an N-Fish, why should we bother about them !?

keith

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

Posted: Sat Dec 03, 2016 6:22 pm Post subject:

JC Van Hay wrote:

Due to the numerous types of an N-Fish, why should we bother about them !?

I sort of agree. All I look for these days are (grouped) strong links and then figure out if they make kites or skyscrapers or whatever.

I can't remember the last time I ever said: Aha! A swordfish.

Keith

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