At row A, number 5 can only be filled in at cell A or B, and therefore, number 5 must be present in cells B+C+F or in cells A+D+E.īased on this statement, the pairs CE, AF and BD are locked pairs as well. If cell A would contain number 5 than cell D+E must contain a 5 for same reason. Therefore, on row F, cell C must contain a 5 (single candidate), and at row J, cell F must contain a 5 (again: single candidate). If cell B would contain numer 5, then cells B and D cannot contain 5. Number 5 is either in the cells B+C+F or in cells A+D+E. The Swordfish method can be explained as follows: This shows 3 parallel lines that show some similarity with a Swordfish. I think the Swordfish pattern becomes visible by connecting cells A-C, B-E and D-F. I don't recall you saying anything similar anywhere else and it would, I think, be clearer just to say, as you normally do and as you do in the example that follows, that the swordfish is in the columns and the eliminations take place in the rows. Beyond that, I cannot see what is gained by the comment that it "reduces to three pairs", when other 2-2-2 examples could "reduce" to various combinations of 3-2-1. I have to wonder whether the example has been reoriented at some stage during development.Īn initial fix would be to change "rows" to "columns" in the quoted sentence. Even though the colours in the diagram show that the swordfish is in the columns, it is still initially confusing - the more so because it would be a 2-2-2 in either orientation. I'd like to reiterate Pieter's point about the potential for confusion in the write-up of the 2-2-2 example.The sentence "The next example has 9 twice in each row and is called a 2-2-2 Swordfish" strongly suggests, twice, that the swordfish is in the rows, and the reference in the following paragraph to the pairs (visibly in the rows) that are "staggered so that they still cover three columns" reinforces this. I'm definitely learning from it - I just used my first swordfish (3-3-2) to solve a newspaper puzzle.
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