The New Sudoku Players' Forum

[Pat]

Code: Select all


 7 1 . | . . 5 | . 2 6
 3 . 2 | 1 . . | 4 7 5
 . 6 5 | 2 . 7 | 3 1 .
-------+-------+------
 . . 7 | 6 2 . | 5 . .
 5 . . | 7 1 8 | 6 . .
 . . 6 | . 5 3 | 7 . .
-------+-------+------
 9 4 8 | 5 7 1 | 2 6 3
 6 5 3 | . . 2 | 1 . 7
 2 7 1 | . . . | . 5 .


X-SuDoku



what would you call this?

X-SuDoku pattern "X"

"finned" X-wing:
(9) b19 \ d,c7 with "fin" = r1c3
-or-
(9) b19 \ d,r1 with "fin" = r9c7

excludes 9 at r1c7

[Leren]

Code: Select all

*------------------------------------------------*
| 7    1  a49 | 3489  3489  5   | 8-9  2   6     |
| 3   b89  2  | 1     689   69  | 4    7   5     |
| 48   6   5  | 2     489   7   | 3    1   9     |
|-------------+-----------------+----------------|
| 148  389 7  | 6     2     49  | 5    389 1489  |
| 5    239 49 | 7     1     8   | 6    349 24    |
| 148  289 6  | 49    5     3   | 7    489 12489 |
|-------------+-----------------+----------------|
| 9    4   8  | 5     7     1   | 2    6   3     |
| 6    5   3  | 489   489   2   | 1   c489 7     |
| 2    7   1  | 3489  346   469 |d89   5   48    |
*------------------------------------------------*

Hi Pat. I think it looks like this. I'd call it a diagonal based skyscraper, which can be viewed as a pair of Sashimi finned X Wings. Here the truth sets are Box 1 and Box 9 the base is \ with fins at r1c3 & r9c7.

A second elimination could have been at r9c3, had there been a 9 there.

Leren

[Hajime]

Are next statements about methods correct?
. All turbot fish (skyscraper, 2string kite included) are all x-chain of length 4 cells
. Finned something are grouped something

[Leren]

Hajime wrote : All turbot fish (skyscraper, 2string kite included) are all x-chain of length 4 cells

Basically Yes, although some might have a grouped Strong link, I can't remember.

Hajime wrote : Finned something are grouped something

If you want to read about the potentially confusing topic of Sashimi Finned X Wings you can read about it on Andrew Stuart's site here.

Leren

[StrmCkr]

Turbots are oddlength niceloops (5 cells) x-cycles (ie forcing chain)

Skyscrapers, 2 String kites, Empty rectangle, x wing, Finned/sashimi Xwings are aic chains specifically x-chain with 2 strong links and 1 weak inference.

They might look the same and elims the same but via deffirent methodologies.