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Sudopedia: Finned Fish

 
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keith



Joined: 19 Sep 2005
Posts: 3175
Location: near Detroit, Michigan, USA

PostPosted: Thu Nov 22, 2012 4:27 am    Post subject: Sudopedia: Finned Fish Reply with quote

Finned Fish
Finned Fish is a variety of fish that has extra candidates in a single box. Like regular fish, it is a single-digit solving technique.
The same names are used for the different sizes:
Finned X-Wing
Size 2
Finned Swordfish
Size 3
Finned Jellyfish
Size 4

How it works

Here is an example of a Finned X-Wing:
Code:
.-------.-------.-------.
| . . . | . . . | . . . |
| / X / | / X / | / / / |
| . . . | . . . | . . . |
:-------+-------+-------:
| . * . | . . . | . . . |
| F X . | / X / | / / / |
| . * . | . . . | . . . |
:-------+-------+-------:
| . . . | . . . | . . . |
| . . . | . . . | . . . |
| . . . | . . . | . . . |
'-------'-------'-------'

The four cells marked X would be an X-Wing if the candidate in the cell marked F were not present. So either there is an X-Wing, or the candidate in F is true. In both cases, the starred cells cannot contain a candidate for this digit. We can eliminate those candidates.
The eliminated candidates can only be within the box containing the fin.
The F cell is known as the fin. In this example, there could also be a candidate in r5c3. This would be called a big fin, but the effects are the same.

See also

Sashimi Fish

History:

From Sudopedia, the free Sudoku reference guide

Finned Fish

From Sudopedia

Revision history
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Diff selection: mark the radio boxes of the versions to compare and hit enter or the button at the bottom.
Legend: (cur) = difference with current version, (last) = difference with preceding version, M = minor edit.


(cur) (last) 03:32, 31 December 2009 Denomales m (dropped the slash from cell 39 as that cell's possible candidate isn't important)
(cur) (last) 03:28, 31 December 2009 Denomales m (replaced the minus sign with a slash so the symbol stands out)
(cur) (last) 21:45, 30 December 2009 Denomales m (added category tag)
(cur) (last) 18:39, 10 October 2008 Bmphilp m (→How it works)
(cur) (last) 12:59, 11 November 2006 Unkx80 m
(cur) (last) 11:27, 2 November 2006 Ruud m (→How it works)
(cur) (last) 11:26, 2 November 2006 Ruud m (→How it works - grid template)
(cur) (last) 22:28, 1 November 2006 Ruud (initial draft)

(Latest | Earliest) View (previous 50) (next 50) (20 | 50 | 100 | 250 | 500).
Retrieved from "http://www.sudopedia.org/wiki/Finned_Fish"

Keith
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