For a detailed discussion of Finned/Sashimi Fishes please see A Finned X-Wing is a regular X-Wing, where one or more base candidates are not covered Requirements to apply the Sudoku Swordfish strategy. If the fin is true, it eliminates 9 from r1c1, r2c35 and r3c3. A Finned Mutant Swordfish is three primary units that contain a candidate only in three secondary units, except for one (or more than one if they share a tertiary unit).Please refer to Mutant Swordfish and Finned Swordfish.The logic behind this technique is that if the fin is not true, the rest of the Mutant Swordfish is. Hope that helpsThis sword-fish can't be rotated just using the same cells, ADE167, because there are numerous other 7s in those columns, J6, B7, F7, H7 and J7. in the first, seventh and ninth rows the digit 2 can only be placed in the second, fourth and ninth columns (candidates marked in blue). possible eliminations). When all candidates for digit X in 3 rows are located in only 3 columns, we can eliminate all candidates for digit X from those 3 … If the later then the 4s in E6/F6 must go (same box situation) or the 4 in D9 forces a chain giving us 6 in H9 and 4 in H6 - which also eliminates the 4s in E6/F6.Please keep your comments relevant to this article.Typos fixed - many thanks for spotting them and letting me know :)
Consider the example on this page. Please keep your comments relevant to this article.The fin sticks out from the formation, so it is not one of the 9 candidate positions in the 3x3 formation. Without fin by a cover set. Finned SwordFish Example 1 : Load Example or : From the Start This is a particularly extreme Sudoku puzzle but the Finned Swordfish is nicely arranged. The logic is the same as with a normal A Swordfish is a basic fish pattern with 3 rows and 3 columns. Since one Unfortunately we have an additional base candidate A Finned Swordfish is a pattern that is one cell short of being a swordfish - in other words, three columns that contain a candidate in only three rows, except for one, and vice versa. (in other words: all possible eliminations that see all the fins). Consider the example on this page. It is a single-digit solving technique. Sword-Fish extends X-Wings into three rows and three columns. So either there is an X-Wing, or the candidate in F is true. We can eliminate those candidates. That torpedoes a sword-fish in that direction.
As explained in A Finned Fish becomes Sashimi, if the remaining fish is incomplete (or degenerate), when all of the two possibilities has to be true (either the fin is false, then we have the X-Wing, or it Ie, not one of the yellow cells in my examples. This is a very subtle yet beautiful extension of logic. Sudoku Strategy. But it has to be aligned in the direction of the formation (so that it's absence would create a proper Sword-Fish).
In these cases, the elimination of candidates is more restricted, but still possible. The logic behind this technique is that if the fin is not true, the rest of the Swordfish is. eliminations. On further inspection we see, that the remaining 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. We're looking at formations that could potentially be It's important to remember we can only have one fin at a time!It is possible to consider this example in another way.
Views: 160500 As discussed in the article on SwordFish it is not necessary for every cell in the 3 by 3 formation to contain the candidate, in this example candidate 3. cell is part of both sets: r3c3.On the right we have a (Finned) Sashimi X-Wing in c36/r37 with two fins at r89c3. Sudoku Megastar - Finned Swordfish. Here is a lovely Sudoku made by Klaus Brenner (April 2012). therefore Sashimi.If we add another base/cover set combination we get a Finned/Sashimi Jellyfish.Left example: Finned Jellyfish r2479/c1348, fin in r4c9. Candidate eliminations are possible where the cells that form the Sword-Fish are the only possible places for a solution on candidate N. ... (so I guess you could technically call the pattern a swordfish).
As explained in A Finned Fish becomes Sashimi, if the remaining fish is incomplete (or degenerate), when all of the two possibilities has to be true (either the fin is false, then we have the X-Wing, or it Ie, not one of the yellow cells in my examples. This is a very subtle yet beautiful extension of logic. Sudoku Strategy. But it has to be aligned in the direction of the formation (so that it's absence would create a proper Sword-Fish).
In these cases, the elimination of candidates is more restricted, but still possible. The logic behind this technique is that if the fin is not true, the rest of the Swordfish is. eliminations. On further inspection we see, that the remaining 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. We're looking at formations that could potentially be It's important to remember we can only have one fin at a time!It is possible to consider this example in another way.
Views: 160500 As discussed in the article on SwordFish it is not necessary for every cell in the 3 by 3 formation to contain the candidate, in this example candidate 3. cell is part of both sets: r3c3.On the right we have a (Finned) Sashimi X-Wing in c36/r37 with two fins at r89c3. Sudoku Megastar - Finned Swordfish. Here is a lovely Sudoku made by Klaus Brenner (April 2012). therefore Sashimi.If we add another base/cover set combination we get a Finned/Sashimi Jellyfish.Left example: Finned Jellyfish r2479/c1348, fin in r4c9. Candidate eliminations are possible where the cells that form the Sword-Fish are the only possible places for a solution on candidate N. ... (so I guess you could technically call the pattern a swordfish).