È una tecnica da esperti quindi non scoraggiamoci se dobbiamo leggere un paio di volte la spiegazione per orientarci: una volta che avremo imparato a usarla potremo eliminare candidati in situazioni altrimenti bloccate. La tecnica XY wing è più complessa da spiegare che da applicare. A sua aplicação resulta normalmente na solução de uma ou mais células na tabela fruto desta eliminação de possibilidades. Também pode simplesmente alterar a estrutura do jogo e permitir a utilização de técnicas mais simples para progredir no puzzle. Brute-Force algorithms are basically computer programs that will solve Sudoku puzzles. On the left the base sets are rows 1, 2, and 9. Se quest’ultimo è giusto, non ci possono essere altri sei nel suo stesso riquadro quindi possiamo eliminare anche il 6 in I4. with N=5, the creative name squirmbag is used. Not a member? Swordfish Example. Let M be the number of locations for candidate N that are not yet fixed. It’s an advanced strategy for sure. Jul 4, 2012 - A while ago I explained the X-Wing solving technique. VIDEO 11: En este video, les enseño la técnica del SWORDFISH o PEZ ESPADA para la solución de sudokus a nivel experto. A good program might be a practical way to solve Sudoku puzzles, (so long as the puzzle is a valid one, that is one of the 6.7 x 10^ 21 grids). Vediamo ora se ci sono numeri che risultano sbagliati in entrambe le nostre possibili soluzioni. Swordfish is similar to X-Wing, but instead of using a rectangle of four squares, it uses a grid of up to nine squares.You can use the swordfish strategy to eliminate candidates. In ogni casella non risolta, cioè, segneremo a matita tutti i numeri che non vengono esclusi dalla loro presenza in caselle vicine all’interno dello stesso riquadro, della stessa riga o della stessa colonna. In the example, In this example, the swordfish is missing 5's at c6,d4. Learn all the tips and secrets to up your sudoku game! Se eliminiamo questo candidato, però, il 6 in H6 deve essere per forza giusto, altrimenti non ci sono sei nella riga. Tracciamo delle frecce rosse verso le caselle che sarebbero confermate se il nostro 6 in C2 fosse giusto, e delle frecce nere verso le caselle che non potrebbero contenere il candidato. The candidate 5 in the dark blue cells are arranged in columns - every column contains 2 or 3 candidates from the dark blue cells and they are the only ones in the corresponding column. To prove this technique, I prefer to use induction. Where a Swordfish is 3 rows (or columns) that have candidates in only 3 columns (or rows), a Mutant Swordfish is three of any kind of unit that have candidates only in three different units. X wing. The analogy can be extended further. The cover sets are columns 1, 5, and 8, the fish digit is 2. Terminology and grid layout. 9 squares x 9 squares A total of 81 squares (9x9 = 81) fill in the blanks with numbers from 1 to 9 according to the rules. Murat Özdemir • 09-09-2017 Swordfish works the same way as X-Wing, but with 3 base sets instead of just 2. Title: sudoku_very_hard_2.pub Created Date: 3/29/2006 11:49:21 Just as the X-Wing involves two candidates in two columns or rows, the Swordfish involves three candidates in three columns or rows.. The first example is a 2-3-2 Swordfish, that looks similarly to the figure above. La tecnica dell’area chiusa è un’estensione più avanzata di quella della X. Prima di studiarla, quindi, dovremo saper usare bene la tecnica della X. Anche quando siamo padroni della tecnica della X, ci vuole un po’ di ragionamento per usare quella dell’area chiusa: non lasciamoci scoraggiare! Swordfishes work exactly the same way as X-Wings, just with three base and three cover sets instead of only two. Before diving into the Swordfish technique, make sure you fully understand the X Wing Technique as the Swordfish builds on that. Swordfish A Swordfish occurs when in three rows all possible cells for a given digit lie in three columns. D’altra parte, una volta eliminato quest’ultimo, il 6 in E9 deve essere per forza giusto, perché è rimasto l’unico candidato nella colonna. En la siguiente imagen hemos quitado los otros valores para dejarlo un poco más claro. Para empezar, señalando todas las casillas donde el … I think the Swordfish pattern becomes visible by connecting cells A-C, B-E and D-F. Se quest’ultimo viene eliminato, il 6 in C6 deve forzatamente essere giusto, o non ci saranno 6 nella riga. Over time, you’ll get better and faster and noticing when it’s safe to eliminate certain numbers from consideration – but for Sudoku beginners, the best strategy when you are trying to fill an empty space is to keep scanning through neighboring rows and columns. If these fall on exactly three common rows, and each of those rows has at least two candidate cells, then all three rows can be cleared of that digit - except in the defining cells. Mentre nella tecnica della X cercavamo di costruire un quadrato, in questo caso ci basta una qualsiasi figura, regolare o irregolare, chiusa. This is common with swordfish, and does not effect the possible eliminations. Each row has at least one item that must be true, by examination of the puzzle grid, Each column has no more than one item that, The table has at least three truths (at each row), The table has no more than three truths (at each column), Further, each table column has exactly one truth. A Swordfish is a basic fish pattern with 3 rows and 3 columns. HoDoKu Solving Technique Index: Example for "(Finned) Sashimi Swordfish" Potremo così eliminarli. A Sudoku X-Wing pattern occurs in many of the more difficult Sudoku puzzles. In this example, the possible locations for 5's are highlighted in green. 6 is the fish digit and rows R1 , R6 and R9 are the base sets. La tecnica dell'area chiusa (o Swordfish) è riservata agli esperti ed è piuttosto difficile da applicare. In questo modo abbiamo escluso due candidati nelle caselle. HoDoKu - Sudoku for addicts: Show Example. Immaginiamo ora che il 6 nella quarta colonna della seconda riga sia al posto giusto. 9 X 9 sudoku . In the sudoku diagram below, in the first, fifth and eighth columns, the digit 5 can only be placed in the fifth, eighth and ninth rows (candidates marked in blue). Più semplicemente, i 6 in C3 e in D9 sono comunque sbagliati perché sono indicati da una freccia nera in entrambi i nostri schemi. There is more than one El Swordfish en este sudoku está en 3 filas (la 3,la 5 y la 8). should be noted, however, that my presentation of the idea of forbidding matrices Here is a diagram that shows a Swordfish in the rows: The candidates in the 3 defining rows are marked X.These candidates only occupy 3 columns. As a member you get heaps of benefits. Basically it is a numbers crunching game, Existe un Swordfish en los 4s de este sudoku, así que explicaremos lo que es y cómo funciona. Swordfish. Want to see when your friends are online? Settimana Sudoku - Dal 2005 il miglior settimanale per i giocatori di sudoku. cells form the swordfish. The only remaining solving method that I … Swordfish in the Rows 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 columns except those located on the defining 3 rows.. The candidates for digit '6' in R1 , R6 and R9 align up perfectly in 3 columns: C1 , C2 and C9 . When to Use Swordfish. Remember how the X wing involved 2 possible numbers in two rows? Swordfish. I guess it's because the logic is just so perfect! Following on from my previous post on advanced Sudoku tips and tricks, in which I introduced the X wing strategy.This post is an introduction to an even more difficult method. Look for three columns with only two candidates for a given digit. It Progress: 80%. The darker green These guys are very hard to find. Become a member and get heaps of stuff, including: NO ADs, online solving tools, save your times, smilies and more! 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Candidates 2 in r7c1 and in r6c8 are cover candidates that are not base candidates and can be eliminated. With N=1, we have the trivial case of a Unique Possibility. type of such a matrix. Prima di poterla applicare, dovremo inserire nella nostra griglia del Sudoku tutti i possibili candidati di ogni cella. In fact it is one of the most complex Sudoku strategies, and that is the Swordfish technique. Proviamo a capire cosa succederebbe agli altri candidati se presupponessimo che il 6 in C2 (indicando con le lettere le colonne e con i numeri le righe) è al suo posto. The logic behind this technique is that if the fin is not true, the rest of the Swordfish is. Swordfish Swordfish works the same way as X-Wing, but with 3 base sets instead of just 2. Igual que ocurre con los X-Wing, un valor en una posición determinada fuerza al otro que esté en la misma fila a no tener ese mismo valor. With N=3, we have a Swordfish. This is the same idea, except now we’re looking at 3 possible numbers in 3 rows or columns. Finned SwordFish Example 1 : Load Example or : From the Start This is a particularly extreme Sudoku puzzle but the Finned Swordfish is nicely arranged. Even if you know it's there, it can take some time to find. With N=3, we have a Swordfish. Para aplicarla, el jugador debe encontrar un dígito candidato en dos celdas en una misma línea, en tres líneas distintas. Sudoku is a popular puzzle with many different versions. Dato che non possono esserci due 6 nella stessa colonna, quello in C3 e quello in C6 vanno eliminati. we have: The table above could also be called a forbidding matrix. Sembra difficilissimo se non lo visualizziamo ma osservando con un po’ di attenzione l’esempio qui sotto diventerà tutto più chiaro. Cercheremo quindi di lavorare su un’area più ampia. Igual que con la estrategia X-Wing, también la Swordfish ayuda a eliminar candidatos en las celdas. This shows 3 parallel lines that show some similarity with a Swordfish. 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 … Dato che non possono esserci due 6 nella stessa riga, quello in C3 andrebbe eliminato. It's one of those things where, after a little time, I finally came to understand how and why it works, but deep down inside I know I could have never thought it up on my own. Non sappiamo dove siano in realtà i 6, ma per forza ce ne deve essere uno nella seconda riga e abbiamo solo due caselle possibili. If a digit is a candidate for at most three cells in each of three different rows and the positions of those cells fall into the exactly three columns, then this digit cannot be a candidate for any other rows in the same three columns. Solving Sudoku : Swordfish. Joining is quick and free. This is very similar to using X-Wings, in that it will allow you to use knowledge about rows to remove candidates from columns, and vice versa. Swordfish is an "X-Wing" on steroids. XY Wing is my favorite technique. 2. In this example, the swordfish is missing 5's at c6,d4. Skip to content SUDOKU SWAMI Solving Sudoku - Swordfish. Swordfish. Post the puzzle or solving technique that's causing you trouble and someone will help. Se il 6 in C6 è giusto, quello in C3 deve essere eliminato. Anche il 6 in D9 è sbagliato (perché abbiamo dimostrato che sarà forzatamente giusto o il candidato in I9 o quello in D2.). Nel nostro caso ne abbiamo presa una rossa e una nera. Allo stesso modo, dato che non possono esserci due 6 nello stesso riquadro, quello in E3 andrebbe eliminato. The darker green cells form the swordfish. 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. I'm not sure why. We offer games in levels 1-20. Per esempio, in questo caso unendo tutti i 6 evidenziati formiamo una figura irregolare ma chiusa (ogni angolo che contiene un numero da determinare, cioè, contiene un 6). Per esempio, nello schema qui sotto abbiamo inserito tutti i candidati. Swordfish is a generalization of X-Wing. Consider the example on this page. Ci può però risolvere situazioni in cui non ci sono altre soluzioni possibili. Ci è costato un bel po’ di fatica ma ora non siamo più bloccati! Using the ‘Swordfish’ Sudoku solving technique Step. lacks their strict mathematical precision. With N=2, we have a standard Este sudoku está casi resuelto, pero hemos llegado a un punto en el que los métodos más simples ya no nos ayudan. It is a single-digit solving technique. Swordfish is another fish pattern composed of base sets and cover sets just like an X-wing, but it is the next step up in terms of power and complexity. (Free and Paid options), SlickRick from CairnsBonita from NHQueenie from Xenia, Ohio, Orianne from Ottawa,Canada, Salishgirl from CA, Indicate which comments you would like to be able to see. A Mutant Swordfish is a swordfish that is expanded beyond just rows and columns. The primary units can be rows, columns, boxes, or any combination, and the secondary units can be any as well. Se questo è giusto, però, dobbiamo eliminare l’altro 6 nello stesso riquadro, in H6. This is common with swordfish, and does not effect the possible eliminations. Técnica Swordfish. It is analogous to an Ntuple, which crosses the possible locations within a large container of N candidates with N cells. With N=4, we have a jellyfish. Credit for the matrix idea belongs to Andrei Zelevinsky and Bruno Greco (gb). Ci può però risolvere situazioni in cui non ci sono altre soluzioni possibili. Since the Swordfish is arranged in columns, we can eliminate all candidates in the corresponding rows. Te hemos dibujado unas flechas para que se vea mejor. Sudoku is a game of recognizing patterns and spotting opportunities. 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. Sudoku Solving Techniques Swordfish. La tecnica dell’area chiusa (o Swordfish) è riservata agli esperti ed è piuttosto difficile da applicare. Take a look at the following Sudoku puzzle. For example: In this example, the possible locations for 5's are highlighted in green. Sudoku puzzle solutions (or game combinations) possible. Swordfish in the Rows . La base della tecnica dell’area chiusa è cercare un numero che si trovi ripetuto sei o più volte in angoli opposti formando una figura chiusa. This is the original, "restrictive" definition. Se questo 6 è giusto, possiamo eliminare gli altri due nella riga. Quindi il 6 del secondo riquadro in basso deve forzatamente essere in I9 (altrimenti questa colonna non ha 6) e possiamo eliminare gli altri candidati nella riga. The Swordfish method can be explained as follows: Statement: Number 5 is either in the cells B+C+F or in cells A+D+E. Qualunque sia il 6 giusto nella seconda riga, infatti, il 6 in C3 è per forza sbagliato, perché abbiamo dimostrato che ha necessariamente un candidato giusto nella sua colonna (in C2 o C6). In questa situazione è difficile proseguire usando i metodi di base che si applicano a una sola riga, a un solo riquadro o a una sola colonna. After you have tried all the easier strategies and find no new squares to solve (single possibility, only square, excluded hidden twins, naked twins, excluded subgroup), it may be worth looking out for Swordfishes. Se però eliminiamo il 6 in I9, deve forzatamente essere giusto quello in I4, o la colonna rimarrà senza sei. ... What Is The Swordfish Strategy? On the left the base sets are rows 1, 2, and 9. Armiamoci di un po’ di pazienza e di due matite colorate. A técnica Swordfish (peixe espadarte) é uma estratégia avançada de eliminação de candidatos no Sudoku.