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Finned swordfish.

 
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zoltag
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Joined: 01 Apr 2006
Posts: 126

PostPosted: Sun Oct 15, 2006 5:40 pm    Post subject: Finned swordfish. Reply with quote

This puzzle has two finned swordfish, according to Sudoku Cue.
I see the first one but the second, which follows the first I cannot detect,
even when I am looking at the outputted hint.

Is the second one truly a swordfish at all?

Code:

...839...
..4.5.7..
8.12.73.5
35..1..72
.........
..2.7.4..
1...2...3
.........
.75.8.29.


Here is the key markup: The +6 is the fin? The -6 is the elimination.
I don't get it. <sigh>
Code:

.------------------.------------------.------------------.
| 5     6     7    | 8     3     9    | 1     2     4    |
| 2     3     4    |*16    5    *16   | 7     8     9    |
| 8     9     1    | 2     4     7    | 3     6     5    |
:------------------+------------------+------------------:
| 3     5     68   | 469   1     468  | 69    7     2    |
| 7     4     68   | 3569  69    2    | 59    135   168  |
| 9     1     2    |*356   7    *3568 | 4     35   *68   |
:------------------+------------------+------------------:
| 1     8     9    | 7     2    *456  | 5+6   45    3    |
| 46    2     3    | 14569 69    1456 | 8     145   7    |
| 46    7     5    | 1346  8     1346 | 2     9     1-6  |
'------------------'------------------'------------------'
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Ruud
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Joined: 30 Dec 2005
Posts: 601

PostPosted: Sun Oct 15, 2006 8:39 pm    Post subject: Reply with quote

The second swordfish is a "sashimi" swordfish. It is not complete, but you can still do the same eliminations. Because it is hard to locate, people sometimes mark all the cells that belong to the swordfish pattern, even when there is no candidate in that cell:

Code:
.------------------.------------------.------------------.
| 5     6     7    | 8     3     9    | 1     2     4    |
| 2     3     4    |*16    5    *16   | 7     8    *9    |
| 8     9     1    | 2     4     7    | 3     6     5    |
:------------------+------------------+------------------:
| 3     5     68   | 469   1     468  | 69    7     2    |
| 7     4     68   | 3569  69    2    | 59    135   168  |
| 9     1     2    |*356   7    *3568 | 4     35   *68   |
:------------------+------------------+------------------:
| 1     8     9    |*7     2    *456  | 5+6   45   *3    |
| 46    2     3    | 14569 69    1456 | 8     145   7    |
| 46    7     5    | 1346  8     1346 | 2     9     1-6  |
'------------------'------------------'------------------'


the +6 is the fin indeed.
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zoltag
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Joined: 01 Apr 2006
Posts: 126

PostPosted: Fri Jan 26, 2007 8:57 pm    Post subject: Reply with quote

Great explanation Ruud. Very hard for me to spot, I'll use your advice and mark the whole pattern. Thanks.
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