1/1/2024 0 Comments Advanced sudoku tricksThe candidates that would be impossible when answering both questions, can be safely removed. If the fin is false and the Swordfish applies, which candidates can I eliminate? If the fin is true, which candidates are impossible? Then, the player must answer two key questions. It is a fin because it sticks out of the regular fish pattern. To apply this strategy, the extra cell must lie within the chain of the Swordfish and share a group with one of the connected cells. If the pattern is 3/3/3, then one row/column will have 4 cells with the digit. In this variant, the player finds the digit is a candidate to an extra cell in one of the rows or columns.įor example, if the player is looking for a configuration of 2/2/2, it means the digit is a candidate to 3 cells in one of those columns/rows. The digits circled in red can be eliminated. Thus, number 3 cannot be a candidate in any cell within the rows highlighted in red. As each cell is connected to at least another column by row, the player can use the Swordfish technique. In this practical example, number 3 is a candidate to only 2 cells within the columns highlighted in blue. Each cell must be connected to at least another by row.īy applying the Sudoku Swordfish strategy, the player can thus eliminate that digit as a candidate to any other cells within the shared rows. The digit must be a candidate to only two or three cells in three different columns. The column pattern follows the exact same principles as the row one, but now inverted. The player can remove the digits circled in red. Since each cell is connected by column, the player has the right pattern to apply the Swordfish technique.Īs a result, number 1 cannot be a candidate in any other cell on the columns highlighted in red. In the three rows highlighted in blue, number 1 has only two possible positions. This grid offers a better example of a pattern the player may find when playing a real puzzle. It is not required that each column contains three cells of the three rows. Each column contains at least 2 shared cells. Each cell is connected to another by column. The digit is restricted to 2 or 3 cells in a row. To find the necessary pattern in a regular game, the player must ensure that: This basic configuration is the least recurrent on puzzles. The solution for the digit in each of the highlighted rows ensures that it cannot be present in any other position within the columns shared by the cells, regardless of the final configuration of the grid. Each position is connected to another by column. In the 3 highlighted rows, the digit is only a candidate to three positions. This is the basic configuration needed to be able to apply the Sudoku Swordfish strategy on rows. In every case, the digit cannot be a candidate to any other cell in the same row/column of the connected based cells. This is the theory, but there is good news! There is no need to test the possibilities because the result is always the same. The digit can then be safely deleted from all the cells that become impossible in all instances. The player can then test the different possibilities. Since the digit only has 2 or 3 possible positions in those row/columns and the cells are linked, it means the solution for that number will forcibly lie within that chain. Each cell must be connected to another by row/column, regardless of the shape created when they are linked. The grid must contain 3 rows or 3 columns where the digit is a candidate to only 2 or 3 cells. This means the player only needs to focus on one digit. The Sudoku Swordfish strategy is a single-candidate technique that uses 3 rows and 3 columns. Requirements to apply the Sudoku Swordfish strategy In these cases, the elimination of candidates is more restricted, but still possible. When one single constraint is missing, the Finned Swordfish or Sashimi Swordfish variants may apply. The grid needs to meet basic constraints in order to apply the Swordfish strategy. It can also allow the player to apply more basic and easier strategies to progress in the puzzle. The use of this strategy usually results in the unveiling of the solution of one or several cells. It is considered as basic due to the clarity of the fish pattern required for its application and its recurrence. The Sudoku Swordfish strategy is a basic advanced technique applied in the hardest levels of these puzzles to eliminate candidates.
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