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Talk:Finned Swordfish
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Revised 'proof' that r4c9<>7
I've changed the argument leading to the removal of 7 from r4c9. IMHO fins lead to arguments by cases: either the digit in question is correct for the fin, in which case you can eliminate (something) directly; or the digit in question is wrong for the fin, in which case you can eliminate (something else) using the fish. The intersection of (something) and (something else) is what gives you the finned-fish inference. 81.151.186.149 21:46, 31 December 2006 (CET)
No objections in replacing the proof - although I thought that both proofs have exactly the same effect. --unkx80 23:26, 31 December 2006 (CET)
I don't understand why you've removed r5c7 from the list of cells that cannot contain a seven. Could you explain that please? 81.151.186.149 07:48, 1 January 2007 (CET)
The reason is that r5c7 is part of the fish. For clarity, I added the Fish diagram for the example to the main page. --unkx80 09:14, 1 January 2007 (CET)
