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| evert
| Joined: 30 Aug 2005 | Posts: 68 | : | Location: Amsterdam | Items |
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Posted: Mon Mar 27, 2006 9:12 pm Post subject: Another Finned XWing question |
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See also http://www.setbb.com/sudoku/viewtopic.php?t=750.
Ruud wrote: | A finned X-Wing is almost an X-Wing. The only difference is that one of the 4 cells has some extra candidates that share a box and a row or column (depending on whether the almost X-Wing lies in the rows or in the columns.
This is the picture:
Code: | . . .|. . .|. . .
. . .|. . .|. . .
. . X|. x .|. . .
-----+-----+-----
. . *|. . .|. . .
. . *|. . .|. . .
F F x|. X .|. . .
-----+-----+-----
. . .|. . .|. . .
. . .|. . .|. . .
. . .|. . .|. . . |
The extra candidates (marked with F) is what people call the 'fin'. Either of these 2 candidates can be available, or both. |
I Understand that the fact that the *s are in the same box as the fin is crucial. Is this correct?
I.e. In
Code: |
. . .|. . .|. . .
. . .|. . .|. . .
. . X|. x .|. . .
-----+-----+-----
. . *|. . .|. . .
. . .|. . .|. . .
F F x|. X .|. . .
-----+-----+-----
. . .|. . .|. . .
. . *|. . .|. . .
. . .|. . .|. . .
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The *s can't be eliminated? |
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| Ruud Site Admin
| Joined: 17 Sep 2005 | Posts: 708 | : | Location: Netherlands | Items |
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Posted: Mon Mar 27, 2006 9:17 pm Post subject: Re: Another Finned XWing question |
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evert wrote: | I Understand that the fact that the *s are in the same box as the fin is crucial. Is this correct?
I.e. In
Code: |
. . .|. . .|. . .
. . .|. . .|. . .
. . X|. x .|. . .
-----+-----+-----
. . *|. . .|. . .
. . .|. . .|. . .
F F x|. X .|. . .
-----+-----+-----
. . .|. . .|. . .
. . *|. . .|. . .
. . .|. . .|. . .
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The *s can't be eliminated? |
You marked 2 cells with * in your example. The top one shares a box with the fin, so it will be eliminated. The bottom one does not.
Ruud _________________ Meet me at sudocue.net |
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