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| kranser
| | Joined: 18 Aug 2005 | | Posts: 35 | | : | |
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 Posted: Thu Oct 13, 2005 9:27 am Post subject: |
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| Nick67 wrote: | I think you may have an off-by-one error here:
| Code: |
... ... ...
... bxb .b.
... .4. .b.
... b.b 4..
... .4. 4..
... ... ...
... bxb .B.
... ... ...
... ... ...
|
Consider the b in r3c8 ... it does not share a row
with other b's. So the group of b cells is not quite
a swordfish (... but it would be if that same b was
in r4c8 instead). |
I think it is a Swordfish - but not one based on columns - instead it's one based on rows as rows 2, 4 and 7 all contain b's in a combination of 3 columns, meaning that the b in R3C8 can be eliminated. Of course in this case there is an easier x-wing on the b's in locations (R4C4, R4C6, R7C4, R7C6)! |
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| Nick67
| | Joined: 08 Sep 2005 | | Posts: 5 | | : | | Location: Sacramento, CA |
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| Posted: Sat Oct 15, 2005 7:59 pm Post subject: |
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Purely for the record:
| kranser wrote: |
I think it is a Swordfish - but not one based on columns - instead it's one based on rows as rows 2, 4 and 7 all contain b's in a combination of 3 columns, meaning that the b in R3C8 can be eliminated. Of course in this case there is an easier x-wing on the b's in locations (R4C4, R4C6, R7C4, R7C6)!
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The "b" notation certainly makes it looks like that.
But DHallman was using "b" to represent key cells
with the candidate 4.
Here is the puzzle without the "b" notation:
| Code: |
*--------------------------------------------------------------------*
| 6 5 4 | 178 9 278 | 3 178 278 |
| 3 27 1 | 4678 247 24678 | 9 478 5 |
| 9 8 27 | 5 1247 3 | 6 147 27 |
|----------------------+----------------------+----------------------|
| 8 27 5 | 479 6 479 | 247 3 1 |
| 1 9 3 | 2 47 5 | 478 78 6 |
| 4 6 27 | 3 8 1 | 27 5 9 |
|----------------------+----------------------+----------------------|
| 5 3 9 | 14 124 24 | 78 6 78 |
| 7 4 8 | 69 5 69 | 1 2 3 |
| 2 1 6 | 78 3 78 | 5 9 4 |
*--------------------------------------------------------------------*
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I think this representation shows clearly that
there is no swordfish of any kind involving the 4's. |
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